Abstract
A 6-bit 1 GS/s single-channel pipeline ADC using an incomplete settling concept is presented. A background sampling-point calibration is proposed to adjust MDAC sampling point so that low gain and low bandwidth opamp can be utilized to conserve power. The prototype ADC in 65-nm CMOS process exhibits an INL of +0.76/ -0.68 LSB and a DNL of +0.72/ -0.68 LSB. Its ENOB is 5.25 bits at Nyquist input frequency with the conversion rate of 1 GS/s. It consumes 62 mW including calibration circuit power at 1 V supply and occupies an active chip area of 0.3 mm <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sup> .
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