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高输入阻抗放大电路的设计仿真与实现
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可编程增益控制放大器的研究实现.pdf81页
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Abstract basic blocks in Programmablegainamplifiers PGA arebuilding employed to the oftheoverall inorder dynamicrange system．
manyapplications optimize isanessentialofthelinear
Amplitudeequalization part signalprocessing．A infrontthe
programmable-gainamplifier PGA isusuallyplaced of ADC，adapting
thelossvariationofthetransmissionchannelinordertoeasethe dynamicrange anautomatic fortheADC．TheofthePGAis controlled
requirement gain digitally
by linear-in-dBcontrolforthePGAisusually
gaincontrol AGC loop．Thegain toachieveconstant timeoftheAGC
required settling loop． The dealswiththestructureandthe methodofthe papermainly design Gain choiceofthe灿ctureisdetermined
ProgrammableAmplifier PGA ．1’Ile by
the ofthe realizationneeds boththe and PGA；the power specification considering
of variable arebasedon majority loop gainamplifiers simple open
differentialorpseudo―Differentialpairs，sourcedegeneration anddifferentialwithdiodeconnected is
multipliers pairs loads；itsdifficulty harmonic feedbacknetworkconsists the andtotal distortion。刃】e
improvinglinearity
ofresistoror thebandwidthand the aremost capacitor,increasingreducingpower needs onthebasic boththe innovation
difficult．Having structures，it investigated
circuitandthemethodoffeedbackto the ofPGAfurther． improveperformance Basedonthe andresearchofthestructureandrealizationof deeplyanalysis PGA， to ofthetransceivertransmittedthe
accordingspecification chip by powerlines，
whichis theRISECOM low PGAhasbeen designedby Co．，Shenzhen，afrequency the of testresultshowsthe of PGAmeetsthe
designed，the performance requirements methodsof and the some
system．The analyzingcircuits，andguidelines designing
havealSObeen presented． source common-mode
Keywords follower,the openloop；closedloop；thesuper DCoffset
feedback；theoutput ．Ⅱ． 独创性声明 本人声明所呈交的论文是我个人在导师指导
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