A low noise and highly linear wideband CMOS RF front-end circuits for digital TV tuners

This paper presents an integrated low noise and highly linear wideband RF front-end circuits for a digital terrestrial and cable TV tuner, which are used as a part of double conversion zero-IF tuner. The low noise amplifier (LNA) shows a low noise figure and high linearity by adopting a noise canceling technique based on current amplification. The up-conversion mixer has high linearity by employing a third order intermodulation cancellation technique. The RF front-end circuits are designed in a 0.18 ¿m CMOS and draw 58 mA from a 1.8 V supply voltage. The RF front-end circuits show a voltage gain of 30 dB, an average single side-band noise figure of 4 dB, an IIP2 of 40 dBm, and an IIP3 of -3 dBm for the entire band from 48 MHz to 862 MHz.