A 6GHz Multi-Path Multi-Frequency Chopping CTΔΣ Modulator achieving 122dBFS SFDR from 150kHz to 120MHz BW
Sundeep Javvaji (TU Delft - Electronic Instrumentation)
Muhammed Bolatkale (NXP Semiconductors, TU Delft - Electronic Instrumentation)
Shagun Bajoria (NXP Semiconductors)
Robert Rutten (NXP Semiconductors)
Bert Oude Essink (NXP Semiconductors)
Koen Beijens (NXP Semiconductors)
Kofi Makinwa (TU Delft - Microelectronics)
Lucien Breems (TU Delft - Electronic Instrumentation, NXP Semiconductors)
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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.