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This paper, power optimization of two high performance ΔΣ modulators for portable measurement applications is presented. One modulator is a single-loop single-bit topology which achieves an 89.8dB peak SNDR and consumes 20μW with a 1.5V supply. Here, a new power efficient current mirror Class-AB OTA is introduced to reduce the power. The other modulator adopts both...
Several power and area efficient multi-bit quantizers are discussed in this paper. Through the comparison and analysis of the reported quantizers, a novel ultra-low power MOSFET-only micromation one for implantable neural applications is proposed to optimize the area and power consumption with the use of high density MOSCAP and dynamic comparators. Simulated in a 0.18 μm 1P6M CMOS process, the density...
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,...
Continuous time (CT) quadrature bandpass sigma delta modulators (QBSDM) are widely used in wireless receivers recently due to its inherent anti-aliasing filtering and complex filtering embedded in the loops to efficiently realize asymmetric noise-shaping. The complex noise-transfer-function (NTF) can be realized with complex coefficients or by implementing the loop as a cascade of complex integrators...
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