A 0.5-V sigma-delta modulator using analog T-switch scheme for the subthreshold leakage suppression
ASP-DAC '06 Proceedings of the 2006 Asia and South Pacific Design Automation Conference
A 0.5-V wideband amplifier for a 1-MHz CT complex delta-sigma modulator
IEEE Transactions on Circuits and Systems II: Express Briefs
A 0.6-V delta-sigma modulator with subthreshold-leakage suppression switches
IEEE Transactions on Circuits and Systems II: Express Briefs
A 0.5-V 81.2 dB SNDR audio-band continuous-time Delta-Sigma modulator with SCR feedback
Analog Integrated Circuits and Signal Processing
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A 0.5-V high performance continuous-time one-bit delta---sigma modulator is reported for audio applications. High performance under this ultra-low supply is achieved by a feed-forward modulator architecture for reduced integrator swing, a special switched-capacitor-resistor feedback for less sensitivity to jitter noise, and a fast-settling fully differential amplifier. The synthesized modulator also has a high thermal-noise-limited SNR of 91 dB over a 20 kHz bandwidth. The 0.5-V fully-differential gate-input amplifier employs an adaptive common-mode feedback frequency compensation circuit, which leads to a robust modulator performance against process, supply voltage and temperature variations. Fabricated in a standard 0.13 μm CMOS process, the modulator achieves a spurious-free dynamic range (SFDR) of 101.9 dB and a signal-to-noise plus distortion ratio (SNDR) of 90 dB (A-weighted) over a 20-kHz signal bandwidth, with the latter being very close to the thermal noise limit. The modulator operates over a supply range from 0.4 to 0.75 V and a temperature range from 驴20 to 90°C.