使用TC1142偏置的GaAs功率放大器

RF bandwidths for cellular systems  such as AMPS, TACS,  GSM,
TDMA, and  CDMA  range  from 800MHz  to  1.0GHz.  To provide RF
transmissions  over   this   range   of   frequencies,   Gallium  Arsenide
(GaAs)  has   become   the   technology   of   choice   and   offers  several
advantages  over   silicon   technology:  a  much  higher   cutoff  fre-
quency, higher  breakdown  voltage,  lower  noise figure,  and  higher
power-added  efficiency. This  translates  to  lower  power  dissipation
and  longer  talk  time  for cellular subscribers.
AN808
UsingtheTC1142forBiasingaGaAsPowerAmplifier
APPLICATION CIRCUIT
Author: Patrick Maresca,
Microchip Technology, Inc. Figure1showsatypicalapplicationcircuitforbiasingaGaAsPA
inacellularsubscriberunit’stransmitter.Eachkeycomponentof
thecircuitisdescribedbelow.
INTRODUCTION
RFbandwidthsforcellularsystemssuchasAMPS,TACS,GSM,