A 0.5-V 90-dB SNDR 102 dB-SFDR audio-band continuous-time delta-sigma modulator
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AbstractA 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 mu m 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 -20 to 90 degrees C.
All Author(s) ListChen Y, Pun KP
Journal nameAnalog Integrated Circuits and Signal Processing
Volume Number71
Issue Number2
PublisherSpringer Verlag (Germany)
Pages159 - 169
LanguagesEnglish-United Kingdom
KeywordsContinuous-time delta-sigma modulator; Low-voltage amplifier; Low-voltage circuit
Web of Science Subject CategoriesComputer Science; Computer Science, Hardware & Architecture; COMPUTER SCIENCE, HARDWARE & ARCHITECTURE; Engineering; Engineering, Electrical & Electronic; ENGINEERING, ELECTRICAL & ELECTRONIC

Last updated on 2021-15-09 at 00:08