AMPLIFIER, AND METHOD OF CONTROLLING GAIN OF LOW NOISE AMPLIFIER (LNA)

摘要

PROBLEM TO BE SOLVED: To provide a differential low noise amplifier (LNA) with common mode feedback and gain control and a method of controlling a gain of the same. SOLUTION: An amplifier can include: a first differential input configured to receive a differential signal; a first current source coupled to the first differential input; a first current load receiving a first bias voltage and coupling an input stage to a first power source; and a first pair of common mode feedback transistors coupled to an output of the first current load and configured to limit a current to the first current source. The input stage provides an amplified signal to an additional stage having structure similar to the input stage, configured to further amplify the amplified signal. COPYRIGHT: (C)2009,JPO&INPIT