Fundamentals of modern VLSI devices
Fundamentals of modern VLSI devices
High-Gain Class-AB OTA with Low Quiescent Current
Analog Integrated Circuits and Signal Processing
A 0.5-V 81.2 dB SNDR audio-band continuous-time Delta-Sigma modulator with SCR feedback
Analog Integrated Circuits and Signal Processing
A 0.5-V 90-dB SNDR 102 dB-SFDR audio-band continuous-time delta---sigma modulator
Analog Integrated Circuits and Signal Processing
A 0.6-V subthreshold-leakage suppressed fully differential CMOS switched-capacitor amplifier
Analog Integrated Circuits and Signal Processing
A 0.6-V 540-nW delta-sigma modulator for biomedical sensors
Analog Integrated Circuits and Signal Processing
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A 0.6-V 34-µW delta-sigma modulator implemented by using a standard 0.13-µm complementary metal-oxide-semiconductor technology is presented. This brief analyzes a subthreshold-leakage current problem in switched-capacitor circuits and proposes subthreshold-leakage suppression switches to solve the problem. To verify the operation of the subthreshold-leakage suppression switches, two different fifth-order delta-sigma modulators are implemented with conventional switches and new switches. The input feedforward architecture is used to reduce the voltage swings of the integrators. A high-performance low-quiescent amplifier architecture is developed for the modulator. The modulator, with new switches, achieves a dynamic range of 83 dB, a peak signal-to-noise ratio of 82 dB, and a peak signal-to-noise-plus-distortion ratio of 81 dB in a signal bandwidth of 20 kHz. The power consumption is 34 µ W for the modulator, and the core chip size is 0.33 mm2.