A 6-GHz Continuous-Time Bandpass ΔΣ ADC With Background Filter Calibration and −100 dBc IM3 for a Mixer-Less DAB Band III Receiver

This article presents a 6-GHz continuous-time bandpass (BP) delta-sigma analog-to-digital converter (ADC) that has been designed for a mixer-less automotive digital audio broadcasting (DAB) III broadcast radio receiver in 28-nm CMOS. The BP ADC can directly digitize the entire DAB III band from 174 to 240 MHz without the need for analog mixers. A precise temperature tracking background calibration guarantees high reception quality over process, voltage and temperature (PVT). The measured IM3 is −100 dBc with two input tones at 210 and 220 MHz, respectively. FM intrusion with a 92 MHz input signal is −101.7 dBc.