Nyquist Rate ADCs Dr Hossein Shamsi K N

Nyquist Rate ADCs Dr. Hossein Shamsi K. N. Toosi University of Technology 0 /31

Content v v v v v Sample & Hold Circuits Voltage Comparators Dual-Slope ADC Flash ADC SAR ADC Cyclic ADC Two-Step ADC Pipelined ADC Time Interleaved ADC 1 /31

Sample and Hold Circuits 2 /31

Ideal Track-and-Hold Circuit 3 /31

Nonidealities 4 /31

Non-zero Acquisition Time Acquisition: ﺍکﺘﺴﺎﺏ ، ﺑﻪ ﺩﺳﺖ آﻮﺭی 5 /31

Cont’d In terms of: ﺑﺮﺣﺴﺐ 6 /31

Thermal Noise Instantaneous: ﻓﻮﺭی ، آﻨی 7 /31

Cont’d 8 /31

Voltage Dependence of Switch 9 /31

Signal Dependent Sampling Instant : ﻟﺤﻈﻪ 10 /31

Hold Mode Leakage 11 /31

Charge Injection and Clock Feedthrough Charge injection: pedestal: پﺎیﻪ 12 /31

First Order Improvements Suppress: ﻓﺮﻭﻧﺸﺎﻧﺪﻥ ، ﺳﺮکﻮﺏ کﺮﺩﻥ 13 /31

Charge Cancellation 14 /31

Differential Sampling 15 /31

CMOS Switch 16 /31

On Resistance of CMOS Switch 17 /31

Analysis 18 /31

Outline 19 /31

Clock Bootstrapping 20 /31

Waveforms 21 /31

Circuit Implementation 22 /31

Bottom Plate Sampling Analysis (1) 23 /31

Bottom Plate Sampling Analysis (2) 24 /31

Fully Differential SHA Circuit 25 /31

Fully Differential SHA Circuit (cont’d) 26 /31

Fully Differential T/H Circuit (cont’d) Show off: ﻧﻤﺎیﺎﻥ ﺷﺪﻥ 27 /31

Capacitors and Plate Parasitics 29 /31

Proper Connection of Capacitors 30 /31

Summary 31 /31