A 2-bit, 3.1 GS/s, band-pass DSM receiver with 53.7 dB SNDR in 35 MHz bandwidth A single-chip RF-digitizing receiver for cellular active antenna systems

This paper presents a radio frequency (RF) continuous-time band-pass delta sigma modulator (CT BP DSM) receiver realized in a 180 nm SiGe BiCMOS technology. The internal quantizer and feedback DAC resolution is 2 bit. Without applying DAC linearization techniques such as trimming or dynamic element matching, measured performance parameters include an SNR and SNDR in 35 MHz of 56.7 dB and 53.7 dB, respectively. Image rejection across the notch center at a quarter of the clock frequency is at least 76 dB. IIP3 and noise figure are -6.6 dBm and 10 dB, respectively.