A 0.032-mm² 43.3-fJ/Step 100-200-MHz IF 2-MHz Bandwidth Bandpass DSM Based on Passive N-Path Filters
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AbstractIn this article, we demonstrate a bandpass (BP) delta-sigma modulator (DSM) using passive N-path filters to implement resonators for high power efficiency, wide intermediate-frequency (IF) tuning range, and small area. The fourth-order modulator loop requires only one active element: an open-loop amplifier. The input magnitude of the amplifier is small due to the modulator's global negative feedback and the passive N-path filter preceding it. This lowers the power consumption of the amplifier and relaxes the design constraints of the switches in the N-path filter. A system model of the linear periodically time-variant structure of the proposed modulator is developed, and its nonidealities are analyzed. A BP DSM prototype realized in a 65-nm CMOS with an active area of 0.032 mm² features an IF tunable from 100 to 200 MHz with a sampling frequency ranging from 400 to 800 MHz. Over a fixed 2-MHz bandwidth, the modulator achieves a signal to noise and distortion ratio (SNDR) greater than 55.5 dB over the entire IF range. A maximal SNDR of 60.5 dB is achieved at 175-MHz IF while consuming 150 μW, which corresponds to a Walden's and Schreier's figure of merits of 43.3 fJ/conv-step and 164.4 dB, respectively.
Acceptance Date14/04/2020
All Author(s) ListYang Zhang, Peter R. Kinget, Kong-Pang Pun
Journal nameIEEE Journal of Solid-State Circuits
Volume Number55
Issue Number9
Pages2443 - 2455
LanguagesEnglish-United States
KeywordsBandpass delta-sigma modulator, linear periodically time-variant circuit, N-path filter, power-efficient circuit and system, tunable intermediate frequency

Last updated on 2021-26-09 at 01:42