A 6GHz Multi-Path Multi-Frequency Chopping CTΔΣ Modulator achieving 122dBFS SFDR from 150kHz to 120MHz BW
Year: 2023
Type: conference-paper
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.
Authors: Sundeep Javvaji, Muhammed Bolatkale, Shagun Bajoria, Robert Rutten, Bert Oude Essink, Koen Beijens, Kofi Makinwa, Lucien Breems
Institutions: Delft University of Technology, NXP (Netherlands)
Language: English
Subfield: Electrical and Electronic Engineering
Field: Engineering
Domain: Physical Sciences
Open Access status: green
OpenAlex ID: W4385192307