Chenxi Huang, Yongdong Chen, Tong Zhang, V. Sathe, J. Rudell
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A 40nm CMOS single-ended switch-capacitor harmonic-rejection power amplifier for ZigBee applications
This paper describes a single-ended switch-capacitor harmonic-rejection power amplifier to operate in the 915 MHz ISM band for ZigBee applications. A multipath feed-forward harmonic-rejection technique is employed to suppress the 2nd/3rd/4th harmonics of the switch-capacitor power amplifier (PA) by 48/17/24 dB, respectively. The measured PA peak drain efficiency is 43% at a peak output power of 8.9dBm with the harmonic-rejection enabled. This PA was implemented in a 40nm TSMC CMOS process with an active area of 180μm×700μm.
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