A CMMB mobile TV tuner frontend with integrated RSSI for dual-band applications

This paper presents a dual band CMMB mobile TV tuner frontend RFIC with integrated Received Signal Strength Indicator (RSSI). The tuner RFIC includes two sets of receiver front-ends for terrestrial and satellite applications. The front-ends further include LNAs with dual gain adjusting, variable gain amplifiers (VGAs), and a mixer with two gm cells plus a common LO switch cell. The built-in Automatic Gain Control (AGC) loop meets wide dynamic range requirement of the mobile TV tuner. The tuner is integrated in a 0.5um SiGe BiCMOS technology and consumes 16mA current from 2.8V supply. The RSSI is fully integrated with only two off-chip capacitors for low pass filtering. The tuner frontend RFIC achieves 45dB of maximum gain, 70dB gain control range, and an IIP3 higher than 18 dBm in minimum gain mode.

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