T7 - Fundamentals of Continuous-Time ADCs.pdf

1、 2024 IEEE International Solid-State Circuits ConferenceFundamentals ofContinuous-Time ADCsShanthi PavanNT Alexander Institute Chair ProfessorIndian Institute of Technology,Madrasshanthiee.iitm.ac.in1S.PavanFundamentals of Continuous-Time ADCs 2024 IEEE International Solid-State Circuits ConferenceO

2、utlineSampling,quantization,and A/D conversionWhat is a continuous-time(CT)ADC?CT-Pipeline ADCsCT delta-sigma&CT-MASH ADCsSummary and conclusionS.PavanFundamentals of Continuous-Time ADCs2 2024 IEEE International Solid-State Circuits ConferenceSampling:Idea“Slow”signal can be recovered from samples

3、S.PavanFundamentals of Continuous-Time ADCs3Guess the signal?ty 2024 IEEE International Solid-State Circuits ConferenceSampling:Idea“Slow”signal can be recovered from samples S.PavanFundamentals of Continuous-Time ADCs4ty 2024 IEEE International Solid-State Circuits ConferenceNyquist Sampling Theore

4、m Signal bandwidth B sampling rate(=fs)2BInputSampledS.PavanFundamentals of Continuous-Time ADCs5 2024 IEEE International Solid-State Circuits ConferenceNyquist Sampling Theorem Signal bandwidth B sampling rate(=fs)2BInputSampledS.PavanFundamentals of Continuous-Time ADCs5 2024 IEEE International So

5、lid-State Circuits ConferenceQuantizationNonlinear,memoryless operationvn can be represented in digital formen=vn-yn quantization errorWhen not overloaded|e|40dB 2024 IEEE International Solid-State Circuits ConferenceAnti-Alias FilterSmall OSR Easy sampler,difficult filterHigh OSR Easy filter,diffic

6、ult samplerWide bandwidth input OSR small(technology-limited fs)S.PavanFundamentals of Continuous-Time ADCs13 2024 IEEE International Solid-State Circuits ConferenceSignal ChainSampler and quantizer ADCDiscrete-time ADCs switched-capacitor techniquesWhat are the problems?S.PavanFundamentals of Conti