A passive mixer-first receiver front-end without external components for mobile TV applications

This paper describes a passive mixer-first receiver front-end (RFE) for mobile TV covering 100MHz to 800MHz without any external components. The proposed input matching technique with RC discharging circuit achieves a simple topology with a low noise. The out-of-band linearity is enhanced using the low pass filtering of sampling capacitor, delivering an outstanding out-of-band linearity. The out-of-band IIP3 and IIP2 are 7dBm and 36dBm, respectively at the maximum gain setting of 36dB. The third and fifth harmonic rejection ratios (HRR) are 49dB and 42dB, respectively. The power consumption is 23mW and the maximum NF is 3.6dB. The active area occupies 0.33mm² in 65nm CMOS technology.