Pub Date : 2018-04-05DOI: 10.1109/WMCAS.2018.8400624
S. Moallemi, Kevin Grout, J. Kitchen
This paper provides an evaluation and mathematical analysis of transformer-based power combiners for outphasing transmitters. Both voltage and current combining are discussed. The non-idealities associated with transformer parasitic coupling inductances are analyzed. This work proposes using a parallel-series combining transformer (PSCT) structure for 2-way outphasing. Finally, this work explores the implementation of a 4-way outphasing transmitter using a transformer combiner.
{"title":"Transformer based power combining for outphasing power amplifiers","authors":"S. Moallemi, Kevin Grout, J. Kitchen","doi":"10.1109/WMCAS.2018.8400624","DOIUrl":"https://doi.org/10.1109/WMCAS.2018.8400624","url":null,"abstract":"This paper provides an evaluation and mathematical analysis of transformer-based power combiners for outphasing transmitters. Both voltage and current combining are discussed. The non-idealities associated with transformer parasitic coupling inductances are analyzed. This work proposes using a parallel-series combining transformer (PSCT) structure for 2-way outphasing. Finally, this work explores the implementation of a 4-way outphasing transmitter using a transformer combiner.","PeriodicalId":254840,"journal":{"name":"2018 Texas Symposium on Wireless and Microwave Circuits and Systems (WMCS)","volume":"40 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-04-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121054071","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2018-04-05DOI: 10.1109/WMCAS.2018.8400622
Kevin Grout, J. Kitchen
This paper presents a derivation of the effects of jitter on a RF pulsewidth modulated (RFPWM) all-digital polar transmitter. A full analysis of the effects of jitter on the transmitter's amplitude and phase error is provided, along with a derivation of the harmonic behavior with regards to jitter. These derived relations can be used in the design and specification of future RFPWM systems. All assertions are verified through circuit simulations of a RFPWM polar modulator in 65nm CMOS.
{"title":"Analysis of jitter on RFPWM systems for all-digital transmitters","authors":"Kevin Grout, J. Kitchen","doi":"10.1109/WMCAS.2018.8400622","DOIUrl":"https://doi.org/10.1109/WMCAS.2018.8400622","url":null,"abstract":"This paper presents a derivation of the effects of jitter on a RF pulsewidth modulated (RFPWM) all-digital polar transmitter. A full analysis of the effects of jitter on the transmitter's amplitude and phase error is provided, along with a derivation of the harmonic behavior with regards to jitter. These derived relations can be used in the design and specification of future RFPWM systems. All assertions are verified through circuit simulations of a RFPWM polar modulator in 65nm CMOS.","PeriodicalId":254840,"journal":{"name":"2018 Texas Symposium on Wireless and Microwave Circuits and Systems (WMCS)","volume":"25 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-04-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124450495","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2018-04-05DOI: 10.1109/WMCAS.2018.8400634
R. Ciocoveanu, R. Weigel, A. Hagelauer, V. Issakov
This paper presents a modified Gilbert-cell mixer employing a novel biasing-scheme used to reduce the high Noise Figure, due to inherently high 1/f noise of MOS transistors. Switching the transistor from strong inversion to accumulation interferes with the self-correlation of the physical noisy process, which leads to a reduction in flicker noise. To illustrate this improvement, a comparison with a conventionally biased mixer is carried. Post-layout simulation results show that this mixer achieves a voltage conversion gain of 2.2 dB, a 1-dB compression point of 3 dBm and a 5 dB reduction in noise figure at 50 kHz, while it draws a current of 13 mA from a single 0.9 V supply. The occupied chip area is 0.5×0.94 mm2. According to author's knowledge this is the first time that bias switching technique is applied to a mixer at mm-wave frequencies.
{"title":"Bias-switched down-conversion mixer for flicker noise reduction in 28-nm CMOS","authors":"R. Ciocoveanu, R. Weigel, A. Hagelauer, V. Issakov","doi":"10.1109/WMCAS.2018.8400634","DOIUrl":"https://doi.org/10.1109/WMCAS.2018.8400634","url":null,"abstract":"This paper presents a modified Gilbert-cell mixer employing a novel biasing-scheme used to reduce the high Noise Figure, due to inherently high 1/f noise of MOS transistors. Switching the transistor from strong inversion to accumulation interferes with the self-correlation of the physical noisy process, which leads to a reduction in flicker noise. To illustrate this improvement, a comparison with a conventionally biased mixer is carried. Post-layout simulation results show that this mixer achieves a voltage conversion gain of 2.2 dB, a 1-dB compression point of 3 dBm and a 5 dB reduction in noise figure at 50 kHz, while it draws a current of 13 mA from a single 0.9 V supply. The occupied chip area is 0.5×0.94 mm2. According to author's knowledge this is the first time that bias switching technique is applied to a mixer at mm-wave frequencies.","PeriodicalId":254840,"journal":{"name":"2018 Texas Symposium on Wireless and Microwave Circuits and Systems (WMCS)","volume":"25 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-04-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125634364","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2018-04-05DOI: 10.1109/WMCAS.2018.8400641
Austin Egbert, Casey Latham, C. Baylis, R. Marks
Space and transmission direction should be considered to give an additional degree of freedom for wireless coexistence in several contemporary applications. Multiple-element arrays allow beam-steering in both radar and fifth-generation (5G) wireless systems. In sharing the wireless spectrum, coexistence in both the spectral and spatial domains can be simultaneously considered. This paper considers how spatial beamforming considerations can be added to spectral masking to govern and confine wireless transmissions as a function of both transmission angle and transmission frequency, and how this framework can be used to promote real-time, adaptive coexistence between different wireless systems.
{"title":"Multi-dimensional coexistence: Using a spatial-spectral mask for spectrum sharing in directional radar and communication","authors":"Austin Egbert, Casey Latham, C. Baylis, R. Marks","doi":"10.1109/WMCAS.2018.8400641","DOIUrl":"https://doi.org/10.1109/WMCAS.2018.8400641","url":null,"abstract":"Space and transmission direction should be considered to give an additional degree of freedom for wireless coexistence in several contemporary applications. Multiple-element arrays allow beam-steering in both radar and fifth-generation (5G) wireless systems. In sharing the wireless spectrum, coexistence in both the spectral and spatial domains can be simultaneously considered. This paper considers how spatial beamforming considerations can be added to spectral masking to govern and confine wireless transmissions as a function of both transmission angle and transmission frequency, and how this framework can be used to promote real-time, adaptive coexistence between different wireless systems.","PeriodicalId":254840,"journal":{"name":"2018 Texas Symposium on Wireless and Microwave Circuits and Systems (WMCS)","volume":"41 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-04-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128576372","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2018-04-05DOI: 10.1109/WMCAS.2018.8400642
Mi Zhou, Y. Gu, Xinrong Li, Shengli Fu, B. Arigong
Power divider is one of the basic components in microwave systems such as amplifiers and antenna feeding networks. Conventional power divider has fixed port impedance such as 25Ω and 50 Ω, and extra impedance matching network is designed to the match for various load impedance. The impedance transformation network will increase the size and introduce extra insertion loss to the circuit. In this paper, a symmetrical two-way power divider with simple structure and impedance transforming property as well as high isolation between two output ports is proposed. The novel structure utilizes shunt stub and series capacitor to cancel the imaginary part of the output impedance. Closed form equations are derived based on the even-odd mode method to analyze the proposed structure, and three experimental power dividers with different output impedance are simulated, fabricated and characterized. The measurement results match well with the simulation results.
{"title":"A symmetrical two-way power divider with impedance transforming property","authors":"Mi Zhou, Y. Gu, Xinrong Li, Shengli Fu, B. Arigong","doi":"10.1109/WMCAS.2018.8400642","DOIUrl":"https://doi.org/10.1109/WMCAS.2018.8400642","url":null,"abstract":"Power divider is one of the basic components in microwave systems such as amplifiers and antenna feeding networks. Conventional power divider has fixed port impedance such as 25Ω and 50 Ω, and extra impedance matching network is designed to the match for various load impedance. The impedance transformation network will increase the size and introduce extra insertion loss to the circuit. In this paper, a symmetrical two-way power divider with simple structure and impedance transforming property as well as high isolation between two output ports is proposed. The novel structure utilizes shunt stub and series capacitor to cancel the imaginary part of the output impedance. Closed form equations are derived based on the even-odd mode method to analyze the proposed structure, and three experimental power dividers with different output impedance are simulated, fabricated and characterized. The measurement results match well with the simulation results.","PeriodicalId":254840,"journal":{"name":"2018 Texas Symposium on Wireless and Microwave Circuits and Systems (WMCS)","volume":"106 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-04-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124918213","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2018-04-05DOI: 10.1109/WMCAS.2018.8400636
C. Yang, P. Gui
CMOS circulators/duplexers based on nonreciprocal transmission line (TL) are proposed for full-duplex transceiver front ends operating at 100 GHz band. Offering nonreciprocal propagation at millimeter wave regime, the presented nonreciprocal TL is made of two parametric mixing stages modulated by signals at around 1/6 of the RF frequencies. Operating together with integrated hybrid couplers, circulators or duplexers can be implemented for full-duplex communication. Realized in CMOS process, this nonreciprocal TL achieves over 45 dB isolation throughout its isolation bandwidth of 1.5 GHz, a maximum 9.5 dB insertion loss (IL) and an over 10 dB return loss.
{"title":"On-chip 100GHz full-duplex circulator/duplexer design based on nonreciprocal transmission line","authors":"C. Yang, P. Gui","doi":"10.1109/WMCAS.2018.8400636","DOIUrl":"https://doi.org/10.1109/WMCAS.2018.8400636","url":null,"abstract":"CMOS circulators/duplexers based on nonreciprocal transmission line (TL) are proposed for full-duplex transceiver front ends operating at 100 GHz band. Offering nonreciprocal propagation at millimeter wave regime, the presented nonreciprocal TL is made of two parametric mixing stages modulated by signals at around 1/6 of the RF frequencies. Operating together with integrated hybrid couplers, circulators or duplexers can be implemented for full-duplex communication. Realized in CMOS process, this nonreciprocal TL achieves over 45 dB isolation throughout its isolation bandwidth of 1.5 GHz, a maximum 9.5 dB insertion loss (IL) and an over 10 dB return loss.","PeriodicalId":254840,"journal":{"name":"2018 Texas Symposium on Wireless and Microwave Circuits and Systems (WMCS)","volume":"66 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-04-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125438187","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2018-04-05DOI: 10.1109/WMCAS.2018.8400628
Ikechukwu W. Agbor, D. Biswas, I. Mahbub
A wide diversification in the designs of flexible wearable antenna is conceivable these days thanks to the innovative utilization of electro-textile materials. These textiles are usually made of conductive yarn either in a twisted or spurn fashion and in some instances have conductive materials interpolated in them to enable electrical conductivity. In this paper, the use of electro-textile as a candidate for wearable patch antenna design is demonstrated. For a comparative analysis of different performance parameters, three patch antennas are designed and fabricated using ShieldiT super, Cobaltex and Copper Polyester Taffeta. Their performances are analyzed in the context of wearable patch antenna working at the 2.4 GHz ISM frequency band. For this comparative analysis, Jeans is used as the substrate due to its low dielectric constant and low loss tangent which results in a higher bandwidth and lower power loss. The measurement results from the fabricated wearable antennas are compared with the simulation results in terms of the reflection coefficient and received power. The objective of this comparative study is to identify the best performing electro-textiles for the next-generation IoT (Internet-of-things) and wearable biomedical sensor applications.
{"title":"A comprehensive analysis of various electro-textile materials for wearable antenna applications","authors":"Ikechukwu W. Agbor, D. Biswas, I. Mahbub","doi":"10.1109/WMCAS.2018.8400628","DOIUrl":"https://doi.org/10.1109/WMCAS.2018.8400628","url":null,"abstract":"A wide diversification in the designs of flexible wearable antenna is conceivable these days thanks to the innovative utilization of electro-textile materials. These textiles are usually made of conductive yarn either in a twisted or spurn fashion and in some instances have conductive materials interpolated in them to enable electrical conductivity. In this paper, the use of electro-textile as a candidate for wearable patch antenna design is demonstrated. For a comparative analysis of different performance parameters, three patch antennas are designed and fabricated using ShieldiT super, Cobaltex and Copper Polyester Taffeta. Their performances are analyzed in the context of wearable patch antenna working at the 2.4 GHz ISM frequency band. For this comparative analysis, Jeans is used as the substrate due to its low dielectric constant and low loss tangent which results in a higher bandwidth and lower power loss. The measurement results from the fabricated wearable antennas are compared with the simulation results in terms of the reflection coefficient and received power. The objective of this comparative study is to identify the best performing electro-textiles for the next-generation IoT (Internet-of-things) and wearable biomedical sensor applications.","PeriodicalId":254840,"journal":{"name":"2018 Texas Symposium on Wireless and Microwave Circuits and Systems (WMCS)","volume":"64 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-04-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116917865","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2018-04-05DOI: 10.1109/WMCAS.2018.8400625
D. Regev, S. Shilo, D. Ezri, Gan Ming
An RF front-end (RFFE) architecture for dual-mode half and full duplex operation, employing a modified quadrature balanced power amplifier (QBPA), is proposed, where the receive channel is connected to the QBPA transmit isolated output. In this RFFE, the receive signal is reconstructed from inherent output reflections of the two internal power amplifiers employed in the modified QBPA. Re-configurable transmit signal isolation at the receive port enables safe LNA operation at half-duplex and relaxed RF self-interference cancellation (SIC) requirements for full-duplex operation. The S-parameter signal flow diagram of the proposed RFFE is described and analyzed, yielding transmit-receive transfer functions of interest in the presence of antenna back-reflected transmit signal. Transmit-receive isolation compensation for antenna reflections is analytically derived. Circuit simulations of the proposed topology verify the model and theoretical analysis.
{"title":"Modified re-configurable quadrature balanced power amplifiers for half and full duplex RF front ends","authors":"D. Regev, S. Shilo, D. Ezri, Gan Ming","doi":"10.1109/WMCAS.2018.8400625","DOIUrl":"https://doi.org/10.1109/WMCAS.2018.8400625","url":null,"abstract":"An RF front-end (RFFE) architecture for dual-mode half and full duplex operation, employing a modified quadrature balanced power amplifier (QBPA), is proposed, where the receive channel is connected to the QBPA transmit isolated output. In this RFFE, the receive signal is reconstructed from inherent output reflections of the two internal power amplifiers employed in the modified QBPA. Re-configurable transmit signal isolation at the receive port enables safe LNA operation at half-duplex and relaxed RF self-interference cancellation (SIC) requirements for full-duplex operation. The S-parameter signal flow diagram of the proposed RFFE is described and analyzed, yielding transmit-receive transfer functions of interest in the presence of antenna back-reflected transmit signal. Transmit-receive isolation compensation for antenna reflections is analytically derived. Circuit simulations of the proposed topology verify the model and theoretical analysis.","PeriodicalId":254840,"journal":{"name":"2018 Texas Symposium on Wireless and Microwave Circuits and Systems (WMCS)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-04-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129823920","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2018-04-05DOI: 10.1109/WMCAS.2018.8400626
Chenkun Wang, X. S. Wang, Feilong Zhang, Cheng Li, Mengfu Di, Albert Z. H. Wang
This paper reviews a co-design technique for ESD protection and RF transmit/receiver (T/R) switches for smartphones from 2G/3G to 5G. Two design examples are discussed: co-design of a 8.5KV-protected SP10T switch in a 180nm SOI CMOS for quad-band GSM and multiple-band WCDMA smartphones, and analysis of ESD-induced impacts on 28GHz/38GHz SPDT switches in a 45nm SOI CMOS for 5G smartphones. The ESD-RFIC co-design technique allows simultaneous design optimization for both ESD protection and RF switch circuits at whole chip level.
本文综述了一种用于智能手机从2G/3G到5G的ESD保护和射频发射/接收(T/R)开关的协同设计技术。讨论了两个设计实例:用于四频段GSM和多频段WCDMA智能手机的180nm SOI CMOS中8.5 kv保护SP10T开关的协同设计，以及用于5G智能手机的45nm SOI CMOS中28GHz/38GHz SPDT开关的静电影响分析。ESD- rfic协同设计技术允许在整个芯片水平上同时设计ESD保护和RF开关电路。
{"title":"ESD and RF switch co-design in SOI CMOS for smartphones from 2G to 5G","authors":"Chenkun Wang, X. S. Wang, Feilong Zhang, Cheng Li, Mengfu Di, Albert Z. H. Wang","doi":"10.1109/WMCAS.2018.8400626","DOIUrl":"https://doi.org/10.1109/WMCAS.2018.8400626","url":null,"abstract":"This paper reviews a co-design technique for ESD protection and RF transmit/receiver (T/R) switches for smartphones from 2G/3G to 5G. Two design examples are discussed: co-design of a 8.5KV-protected SP10T switch in a 180nm SOI CMOS for quad-band GSM and multiple-band WCDMA smartphones, and analysis of ESD-induced impacts on 28GHz/38GHz SPDT switches in a 45nm SOI CMOS for 5G smartphones. The ESD-RFIC co-design technique allows simultaneous design optimization for both ESD protection and RF switch circuits at whole chip level.","PeriodicalId":254840,"journal":{"name":"2018 Texas Symposium on Wireless and Microwave Circuits and Systems (WMCS)","volume":"134 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-04-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128490397","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2018-04-05DOI: 10.1109/WMCAS.2018.8400623
J. Mayeda, D. Lie, J. Lopez
A highly efficient two-stage 6 GHz fully-integrated GaN power amplifier (PA) designed for 5G microcell communication is reported in this work. Post-layout SPICE simulations show this two-stage PA achieves an output 1 dB compression Pout, idb above 33 dBm and greater than 31 dB gain and 34% PAE (power-added efficiency) for CW operation at 6 GHz. When the PA is driven with 5/10/20 MHz LTE 16QAM modulated signals, the simulated output spectra and adjacent channel leakage ratio (ACLR) at 4 dB below Pout, 1db passed the LTE spectrum emission mask (SEM) without any predistortion. Operated at a 28 V supply, this fully monolithic PA achieves reasonable frequency performance and linearity while it did not adopt the Doherty architecture for backoff efficiency enhancement; however, simulations suggest it may deliver good PAE values at power backoff when supply modulation is used to make it competitive for 5G PA microcell applications.
{"title":"A high efficiency fully-monolithic 2-stage C-band GaN power amplifier for 5G microcell applications","authors":"J. Mayeda, D. Lie, J. Lopez","doi":"10.1109/WMCAS.2018.8400623","DOIUrl":"https://doi.org/10.1109/WMCAS.2018.8400623","url":null,"abstract":"A highly efficient two-stage 6 GHz fully-integrated GaN power amplifier (PA) designed for 5G microcell communication is reported in this work. Post-layout SPICE simulations show this two-stage PA achieves an output 1 dB compression Pout, idb above 33 dBm and greater than 31 dB gain and 34% PAE (power-added efficiency) for CW operation at 6 GHz. When the PA is driven with 5/10/20 MHz LTE 16QAM modulated signals, the simulated output spectra and adjacent channel leakage ratio (ACLR) at 4 dB below Pout, 1db passed the LTE spectrum emission mask (SEM) without any predistortion. Operated at a 28 V supply, this fully monolithic PA achieves reasonable frequency performance and linearity while it did not adopt the Doherty architecture for backoff efficiency enhancement; however, simulations suggest it may deliver good PAE values at power backoff when supply modulation is used to make it competitive for 5G PA microcell applications.","PeriodicalId":254840,"journal":{"name":"2018 Texas Symposium on Wireless and Microwave Circuits and Systems (WMCS)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-04-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125852572","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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