A Highly Linear Broadband Variable Gain LNA for TV Applications

摘要

A broadband variable-gain low noise amplifier with triple output for TV tuners has been demonstrated in a 0.18μm SiGe technology. The gain varies continuously from 27dB to -28dB and has better than 1dB precision over a 1GHz bandwidth. At 27dB gain the amplifier shows 6.5dB NF, 82dBmV OIP3 and 121dBmV OIP2. OIP3 is above 73dBmV down to -21dB gain. With all three outputs enabled the circuit draws 170mA from a 3.3V supply.