EE 435 Lect 38 Spring 2010

EE 435 Lect 38 Spring 2010 - EE 435 Lecture 38 ADC Design...

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Unformatted text preview: EE 435 Lecture 38 ADC Design Current Steering DAC with Supply Independent Biasing d d I X 1 d 1 d I X N 1 d N 1 d I X V DD V REF R V XX I A I B If transistors on top row are all matched, I X =V REF /R Provides Differential Output Currents Thermometer coded structure (requires binary to thermometer decoder) N 1 REF A i i 0 V I d R = = N=2 n . Review from last lecture . Dynamic Current Source Matching Correct charge is stored on C to make all currents equal to I REF Does not require matching of transistors or capacitors Requires refreshing to keep charge on C Form of self-calibration Calibrates current sources one at a time Current source unavailable for use while calibrating Can be directly used in DACs (thermometer of binary coded) 1 I 1 C1 C1 C 2 I 2 C2 C2 C k I k Ck Ck C I REF Often termed Current Copier or Current Replication circuit . Review from last lecture . A charge redistribution circuit...
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This note was uploaded on 01/31/2012 for the course EE 345 taught by Professor Geiger during the Fall '11 term at Iowa State.

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EE 435 Lect 38 Spring 2010 - EE 435 Lecture 38 ADC Design...

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