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EECS240 – Spring 2010Lecture 20: ComparatorsElad AlonDept. of EECSEECS240 Lecture 20 2Comparator• Specs and issues:• Clock rate fs• Offset• Resolution• Hysteresis• Input cap• Power dissipation• CM rejection• Kickback noise• …EECS240 Lecture 20 3Flash Converter• Fast: one clock cycle per conversion• High complexity: 2B-1 comparators• High input capacitanceR/2RRRR/2REncoderDigitalOutputVINVREFEECS240 Lecture 20 4Comparator Gain-BandwidthExample:• 4Gb/s link• Minimum ∆V: 1mV• Vdd = 1VÆ Av> 1V / 1mV = 1000 in < 250ps!EECS240 Lecture 20 5Operational Amplifier?3213T23T10001.33THz3 250psudBvo bitvoubitffAAf−=====×EECS240 Lecture 20 6Open-Loop Amplifier CascadeEECS240 Lecture 20 7Cascaded Amplifier• Simplified bandwidth analysis:• Open-circuit time constants• (Not most accurate, but leads to nearly the right answer for design optimization) EECS240 Lecture 20 8Bandwidth/Gain OptimizationEECS240 Lecture 20 9Bandwidth/Gain OptimizationEECS240 Lecture 20 10Power ConsumptionEECS240 Lecture 20 11Regenerative LatchEECS240 Lecture 20 12CML Comparator (Latch)EECS240 Lecture 20 13StrongArm LatchEECS240 Lecture 20 14HysteresisEECS240 Lecture 20 15Overdrive RecoveryEECS240 Lecture 20 16KickbackEECS240 Lecture 20 17Kickback cont’dEECS240 Lecture 20 18Kickback


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Berkeley ELENG 240A - Lecture 20: Comparators

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