A 9µW 88dB DR fully-clocked switched-opamp ΔΣ modulator with novel power and area efficient resonator
A 9µW 88dB DR switched-opamp (SO) ΔΣ modulator is implemented in a low cost 0.35µm CMOS process. To evaluate the effects of finite voltage gain and 1/f noise clearly, two high efficient methods are introduced. And a new fully switched-off SO with a 50% power saving and double Figure-of-Merit (FOM) over the traditional type is proposed to reduce the total power. Besides, to improve the performance, a novel resonator idea applicable to SO technique is adopted to realize a coefficient of 1/100 with 75% power and 70% area reduction over the conventional design. The FOM of the designed modulator is highest among the collected recent low power modulators.