20 GHz Clock Frequency ROM-Less Direct Digital Synthesizer Comprising Unique Phase Control Unit in 0.25 μm SiGe Technology

A. Shrestha, J. Moll, A. Raemer, M. Hrobak, V. Krozer
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引用次数: 5

Abstract

This paper presents work on a 20 GHz ROM-less direct digital synthesizer (DDS) with 12-bit phase and 6-bit amplitude resolution in a 0.25μm SiGe technology having ft/fmax 180/220GHz. The DDS is applicable for wireless communications and is capable of generating sinusoidal and complex waveforms up to 10 GHz. The 12-bit reduced size pipeline accumulator has been designed with a novel 6-bit phase control word unit to facilitate digital phase modulation schemes. The DDS has been successfully measured and characterized using a dedicated PCB board. Its operation has been confirmed in terms of frequency settings. The output amplitude from the DDS is lower than expected due to losses in the FR4 PCB. To our knowledge this DDS is the first attempt to employ a digital phase control and is among the fastest DDS in SiGe BiCMOS reported so far. The total power consumption is only 1.54 W. The DDS has an output frequency range from 5 MHz to 10 GHz with worst case spurious free dynamic range (SFDR) of 25 dBc with a maximum clock frequency of 20 GHz. The frequency settling time is below 300 ns.
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20 GHz时钟频率无rom直接数字合成器,包含0.25 μm SiGe技术的独特相位控制单元
本文介绍了一个20GHz无rom直接数字合成器(DDS)的工作,该合成器具有12位相位和6位振幅分辨率,采用0.25μm SiGe技术,ft/fmax为180/220GHz。DDS适用于无线通信,能够产生高达10ghz的正弦波和复杂波形。采用新颖的6位相位控制字单元设计了12位缩小尺寸的管道蓄能器,以方便数字相位调制方案。使用专用PCB板成功地测量和表征了DDS。在频率设置方面已经确认了它的运行。由于FR4 PCB中的损耗,DDS的输出幅度低于预期。据我们所知,这个DDS是第一次尝试采用数字相位控制,是迄今为止报道的SiGe BiCMOS中最快的DDS之一。整机功耗仅为1.54 W。DDS的输出频率范围为5mhz ~ 10ghz,最坏情况无杂散动态范围(SFDR)为25dbc,最大时钟频率为20ghz。频率稳定时间小于300ns。
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