A 1.16mW 69dB SNR (1.2MHz BW) continuous time £Δ ADC with immunity to clock jitter

摘要

A low-power jitter tolerant 2^nd order active-passive continuous-time sigma-delta ADC in 65nm CMOS is presented. The use of just one active Gm-C integrator and a feed-forward path from the ADC''s input to the Gm''s output helps reduce power consumption. A FIR filter in the outermost feedback path reduces clock jitter impact. For a −2dBFS input, the ADC clocked at 300MHz achieves a 69dB SNR (10KHz – 1.2MHz BW) while consuming 1.16mW from a 1.4V supply.