Split-Array, C-2C Switched-Capacitor Power Amplifiers

This paper presents a 13-b C-2C split-array (SA) multiphase switched-capacitor power amplifier (SAMP-SCPA) implemented in 65-nm CMOS. The SAMP-SCPA was designed for 16-b resolution to offer extra states for linearization/calibration using digital pre-distortion (DPD). Resolution limits for SA SCPAs...

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Published in:IEEE journal of solid-state circuits 2018-06, Vol.53 (6), p.1666-1677
Main Authors: Bai, Zhidong, Azam, Ali, Johnson, Dallas, Yuan, Wen, Walling, Jeffrey S.
Format: Article
Language:English
Subjects:
Arrays
C-2C array
Capacitance
Capacitors
class-D power amplifier (PA)
Clocks
CMOS
digital PA
Linearity
multiphase switched-capacitor power amplifier (SCPA)
Power amplifiers
Power generation
Radio frequency
radio frequency digital-to-analog converter (RF DAC)
Switches
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cited_by cdi_FETCH-LOGICAL-c293t-ec9ad48a0d68015771add086af68b8338aed3c5031abc143c8d6c23626d406253
cites cdi_FETCH-LOGICAL-c293t-ec9ad48a0d68015771add086af68b8338aed3c5031abc143c8d6c23626d406253
container_end_page 1677
container_issue 6
container_start_page 1666
container_title IEEE journal of solid-state circuits
container_volume 53
creator Bai, Zhidong
Azam, Ali
Johnson, Dallas
Yuan, Wen
Walling, Jeffrey S.
description This paper presents a 13-b C-2C split-array (SA) multiphase switched-capacitor power amplifier (SAMP-SCPA) implemented in 65-nm CMOS. The SAMP-SCPA was designed for 16-b resolution to offer extra states for linearization/calibration using digital pre-distortion (DPD). Resolution limits for SA SCPAs are presented. The SAMP-SCPA allows for the improvement of the SCPA resolution while minimizing the impact on the input power required driving it. A prototype SAMP-SCPA, occupying 0.85 mm \times 2 mm, delivers a peak output power of 24 dBm with a peak system efficiency (SE) of 40% at 1.8 GHz. When amplifying a long-term evolution (LTE) signal, the average output power and SE are 18.8 dBm and 21.6%, respectively, with an adjacent channel leakage ration (ACLR) < −30 dBc and error vector magnitude (EVM) of 2.65% rms. The increased resolution allows output power to be traded off for improved linearity and a low power mode demonstrates an EVM as low as 1% rms.
doi_str_mv 10.1109/JSSC.2018.2805872
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subjects Arrays
C-2C array
Capacitance
Capacitors
class-D power amplifier (PA)
Clocks
CMOS
digital PA
Linearity
multiphase switched-capacitor power amplifier (SCPA)
Power amplifiers
Power generation
Radio frequency
radio frequency digital-to-analog converter (RF DAC)
Switches
title Split-Array, C-2C Switched-Capacitor Power Amplifiers
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