A 6GHz Multi-Path Multi-Frequency Chopping CTΔΣ Modulator achieving 122dBFS SFDR from 150kHz to 120MHz BW

Conference paper (2023)

Authors

L.S. Javvaji Electronic Instrumentation - EEMCS
M. Bolatkale NXP Semiconductors, Electronic Instrumentation - EEMCS
Shagun Bajoria NXP Semiconductors
Robert Rutten NXP Semiconductors
Bert Oude Essink NXP Semiconductors
Koen Beijens NXP Semiconductors
K.A.A. Makinwa Microelectronics
L.J. Breems NXP Semiconductors, Electronic Instrumentation - EEMCS
Research Group
Electronic Instrumentation (EEMCS) (TU Delft)
Copyright: © 2023 L.S. Javvaji, M. Bolatkale, Shagun Bajoria, Robert Rutten, Bert Oude Essink, Koen Beijens, K.A.A. Makinwa, L.J. Breems
DOI
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https://doi.org/10.23919/VLSITechnologyandCir57934.2023.10185356
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Published Date

2023

Language

English

Reuse Rights

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Faculty

Electrical Engineering, Mathematics and Computer Science

Department

Microelectronics

Research Group

Electronic Instrumentation

Abstract

Advances in CMOS technologies have led to the development of continuous-time ΔΣ modulators (CTDSMs) with GHz sampling rates that achieve better than-100dBc linearity and bandwidths above 100MHz. However, at low frequencies (below 10MHz), their SNDR is limited by 1/f noise, which limits their use in radio receivers intended to cover both the AM and the FM bands. In this work, a multi-path multi-frequency chopping scheme is proposed to suppress 1/f noise, while maintaining interferer robustness, noise, spurious, and linearity performance. Implemented in a CTDSM sampling at 6GHz, it reduces its 1/f noise corner frequency by 22x and achieves -98.3dBc THD, 122dBFS SFDR in 120MHzBW.