A low-noise analog baseband in 65nm CMOS

In this paper, a universal receiver baseband approach is introduced. The chain includes a post-mixer noise shaping blocker pre-filter, a programmable-gain post mixer amplifier (PMA) with blocker suppression, a differential ramp-based linear-in-dB variable gain amplifier and a Sallen-Key output buffer. The 1.2-V chain is implemented in a 65-nm CMOS process, occupying a die area of 0.45 mm
²
. While the device can be tuned across a bandwidth of 700-KHz to 5.2-MHz with 20 KHz resolution, it is tested for two distinct mobile-TV applications; Integrated Services Digital Broadcasting-Terrestrial ISDB-T (3-Segment fc=700 KHz) and Digital Video Broadcasting-Terrestrial/Handheld (DVB-T/H fc=3.8 MHz).