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

This paper presents a 28nm CMOS continuous-time bandpass delta-sigma ADC for a mixer-less high-performance automotive digital audio broadcasting (DAB) radio receiver. The ADC achieves $\mathbf{7 2. 6 d B}$ SNDR in 66 MHz bandwidth ranging from 174 MHz to 240 MHz to digitize the full DAB band III. The measured IMx components up to 240 MHz are below -100 dBc, exceeding state-of-the-art by 20dB. The ADC has a precise background loop filter calibration to guarantee stable noise performance over PVT.