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- Rushabh Mehta, Manthan Sheth

EE5316 CMOS MIXED SIGNAL IC DESIGN – PRESENTATION 1 (SELECTION OF ARCHITECTURE) DIGITAL TO ANALOG CONVERTER. - Rushabh Mehta, Manthan Sheth. ARCHITECTURE. NYQUIST RATE. OVERSAMPLING. INTERPOLATING . BINARY WEIGHTED Fast Less complex circuitry Prone to mismatch errors THERMOMETER CODED

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- Rushabh Mehta, Manthan Sheth

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  1. EE5316 CMOS MIXED SIGNAL IC DESIGN – PRESENTATION 1 (SELECTION OF ARCHITECTURE)DIGITAL TO ANALOG CONVERTER - Rushabh Mehta, Manthan Sheth The University of Texas at Arlington

  2. ARCHITECTURE NYQUIST RATE OVERSAMPLING INTERPOLATING • BINARY WEIGHTED • Fast • Less complex circuitry • Prone to mismatch errors • THERMOMETER CODED • Easy matching • Monotonic • Better INL & DNL than binary weighted • Slower than binary weighted • DIRECT ENCODED • Low speed due to RC delays • Resistor matching difficult • HYBRID • Contains segments of various other architectures • ALGORITHMIC • Slow • High real estate & power consumption The University of Texas at Arlington

  3. BINARY WEIGHTED DAC • CURRENT STEERING • Consumes less real estate • Fast for resolution < 10bits • High power efficiency • R - 2R LADDER • High power consumption • Good impedance matching • Prone to glitch problems • CHARGE REDISTRIBUTION DAC • Slow due to RC delays • Finite bandwidth of opamp The University of Texas at Arlington

  4. THERMOMETER CODED DAC • Converts binary input into thermometer code • N binary inputs give 2n – 1 thermometer coded bits • Reference elements are equal in size thus aiding matching of the various elements • Monotonic in nature with INL & DNL better than binary weighted DACs The University of Texas at Arlington

  5. HYBRID DAC • Employs a combination of the afore-mentioned architectures • Hence includes the advantages of the respective architecture The University of Texas at Arlington

  6. DOUBLE SEGMENTED THERMOMETER CODED WITH BINARY WEIGHTED CURRENT STEERING • For the given specifications, the Double Segmented Thermometer Coded with Binary Weighted Current Steering hybrid architecture is used. • It promises to meet the required SFDR and Speed requirements. • Double segmented is proposed for reduced area 12 The University of Texas at Arlington

  7. CIRCUIT IMPLEMENTATION Current Steering implementation for Thermometer Coded DAC Segment Current Steering implementation for Binary Weighted DAC Segment The University of Texas at Arlington

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