2014 Volume 11 Issue 2 Pages 20130986
A 1.0GHz signal bandwidth 8-bit folding and interpolating analog-to-digital converter (ADC) is presented, whose Fom is only 42fJ/Conv-step. In this design, averaging resistors and interpolating resistors are shared, which can be save pr-amplifiers and active interpolators. Grouped T/H blocks are adopted to cancel the voltage buffer between the T/H block and the pre-amplifiers array. A new full-digital T/H switch is proposed to cancel the bootstrapped capacitor, which can save the area of chip grandly. A new linear and continues offset voltages of dynamic comparator calibration method is presented. This ADC implemented in 65nm CMOS technology achieves SNDR of 48.5dB and SFDR of 58.7dB for 479.5MHz input frequency at the rate of 1.0-GS/s. And the SNDR and SFDR maintain above 48dB and 55dB, respectively, up to 995.1MHz. The power consumption is only 17mW with a supply voltage of 1.2V.
