A Variable Gain Low-Noise Amplifier with Noise and Nonlinearity Cancellation for DVB Applications

摘要

A variable gain low-noise amplifier (LNA) RFIC with noise and nonlinearity cancellation is developed in 0.18-μm CMOS technology. This variable gain LNA is designed for the need of low power consumption and high performance in DVB applications. The variable gain LNA achieves the maximum gain of 9.2 - 14.4 dB from 50 MHz to 860 MHz, which also provides the dynamic range more than 30 dB. The input and output return losses less than -5.6 dB and -10 dB, respectively. The supply voltage is 1.8 V and power consumption is 19.8 mW. With the success of cancellation, the variable gain LNA with maximum gain has the measured noise figure of 2.5 - 3.5 dB and the measured OIP_3 of 10 - 17 dBm from 50 MHz to 860 MHz. The chip area of the implemented variable gain LNA RFIC is 0.78 × 0.85 mm~2.