“A 300 mV, auto-shutdown comparator
based on a novel clock gating network is designed. The
auto-shutdown comparator is employed to realize a compact,
ultra-low power continuous-time delta sigma modulator (CTDSM)
with a 300 mV supply voltage for multi-channel sensing and
biomedical applications. The design was fabricated in standard
mixed-mode 180 nm CMOS process. Measurement results show
that the CTDSM achieves a peak SNDR of 54.81 dB and DR
of 57.4 dB while consuming a core power of 1.76 W at 300
mV supply voltage without the clock-gated comparator. With the
clock-gated auto-shutdown comparator, the CTDSM consumes a
core power of only 220 nW thereby providing an 8 times power
saving.”