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 φ I 1 C1 φ C1 φ C 2 φ I 2 C2 φ C2 φ C k φ I k Ck φ Ck φ C I REF Often termed “Current Copier” or “Current Replication” circuit .• •• • • Review from last lecture .• •• • • A charge redistribution circuit...
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EE 435 Lect 38 Spring 2010 - EE 435 Lecture 38 ADC Design...

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