Title :
Digitally assisted feedforward power amplifier
Author :
Pinckley, D.T. ; Chu, T. ; McBeath, S.M.
Author_Institution :
Motorola Labs, Fort Worth, TX, USA
Abstract :
Digitally assisted feedforward (DAFF) is a digital enhancement to a feedforward power amplifier (PA). In the standard feedforward configuration, both on-channel and off-channel distortion is suppressed. In the DAFF configuration, a special reference signal is generated such that only the off-channel distortion is suppressed. This process greatly reduces the peak-to-average power in the error amplifier, which facilitates an increase in output power for the entire amplification circuit. Additionally, one can suppress on-channel distortion to varying degrees, which simply reduces, to varying degrees, the improvement in output power.
Keywords :
MMIC power amplifiers; UHF integrated circuits; UHF power amplifiers; distortion; feedforward; DAFF; digital enhancement; digitally assisted feedforward power amplifier; error amplifier; off-channel distortion; on-channel distortion; output power; peak-to-average power; reference signal; standard feedforward configuration; Baseband; Circuits; Error correction; Filters; Frequency; Nonlinear distortion; Peak to average power ratio; Power amplifiers; Power generation; Signal generators;
Conference_Titel :
Circuits and Systems, 2002. MWSCAS-2002. The 2002 45th Midwest Symposium on
Print_ISBN :
0-7803-7523-8
DOI :
10.1109/MWSCAS.2002.1186898
