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A single-channel, asynchronous successive-approximation (SA) ADC with improved feedback delay is fabricated in 40 nm CMOS. Compared with a conventional SAR structure that employs a single quantizer controlled by a digital feedback logic loop, the proposed SAR-ADC employs multiple quantizers for each conversion bit, clocked by an asynchronous ripple clock that is generated after each quantization....
A single channel, loop-unrolled, asynchronous successive approximation (SAR) ADC fabricated in 40nm CMOS is presented. Compared with a conventional SAR structure that exhibits significant delay in the digital feedback logic, the proposed 6b SAR-ADC employs a different comparator for each bit of conversion, with an asynchronous ripple clock generated after each quantization. With the sample rate limited...
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