A Multiband Mobile Analog TV Tuner SoC With 78-dB Harmonic Rejection and GSM Blocker Detection in 65-nm CMOS

摘要

A 48–885–MHz ultralow-cost high-performance mobile analog TV (MATV) tuner with an improved harmonic rejection design algorithm achieves 5.5 dB/4.5 dB noise figure at VHF and UHF bands, respectively, and adjacent channel interference (ACI) ${rm N}+1/{rm N}+2$ performance of 24/29 dB. A harmonic rejection mixer (HRM) with a tracking filter (TF) scheme employing three external inductors, one for each TV band, achieves better than 78/83-dB harmonic-rejection for the VHFI/VHFIII bands. A single LC-tank VCO with a programmable divider that has a 50% duty cycle correction scheme covers the entire TV band with accurate LO phases. A digital automatic gain control (AGC) scheme detects the presence of ACI and/or GSM burst-mode blockers through an RF wideband peak detector (WBPD) and adjusts the receiver gain for optimum dynamic range. The RF tuner is fabricated in 65-nm CMOS technology with silicon area of only 1.25 $hbox{mm}^{2}$ and draws 37/19 mA for analog TV and FM radio receiver modes, respectively.