Paper Info
Title
A switched-capacitor controlled digital-current modulated class-E EER transmitter
Abstract
An envelope elimination and restoration (EER) transmitter that comprises a class-E power amplifier and a digitally controlled current DAC modulator is presented. A switched capacitor DAC is designed to control an open-loop transconductor that operates as a current modulator, modulating the amplitude of the current supplied to a class-E PA. Such a topology allows for increased filtering of the quantization noise that is problematic in most digital PAs (DPA). The system measurements yield a peak output power and power added efficiency (PAE) of 22.5 dBm and 23.6%, respectively. When applying a WCDMA signal, the measured EVM is 1.32% and the adjacent channel power ratio (ACPR) is -37.9 dBc, while outputting 19.9 dBm at 14.3% PAE. For an LTE signal, the measured EVM is 3.72% and the ACLR is -30.2 dBc, while outputting 18.1 dBm at 10.6% PAE.
Year
DOI
Venue
2015
10.1109/NEWCAS.2015.7182014
NEWCAS
Keywords
Field
DocType
digital control,digital-analogue conversion,power amplifiers,switched capacitor networks,class-E power amplifier,current modulator,digitally controlled current DAC modulator,efficiency 10.6 percent,efficiency 14.3 percent,efficiency 23.6 percent,envelope elimination and restoration transmitter,open-loop transconductor,switched capacitor DAC,switched-capacitor controlled digital-current modulated class-E EER transmitter,class-E power amplifier,envelope elimination and restoration (EER),switched capacitor circuits
Transmitter,Computer science,Switched capacitor,Control engineering,Modulation,Electronic engineering,Adjacent channel power ratio,Power-added efficiency,dBc,RF power amplifier,Electrical engineering,Amplifier
Conference
ISSN
Citations 
PageRank 
2472-467X
2
0.40
References 
Authors
7
2
Name
Order
Citations
PageRank
Wen Yuan1345.20
Jeffrey S. Walling216319.89