Patent ID: 6288609
Filing Date: 2001-09-11
Classification: H03G

Abstract:
A gain controllable low noise amplifier (LNA) with automatic linearity enhancement comprising:an amplifier stage for amplifying a radio frequency (RF) input signal;a dynamically controllable feedback loop amplifier stage for providing negative feedback to the feedback amplifier;a bias controller coupled to the dynamically controllable feedback loop amplifier stage for monitoring a receiver automatic gain control (AGC) system and providing a dynamic bias to the dynamically controllable feedback loop amplifier stage to improve linearity to the LNA in the presence of strong on-channel and off-channel signal conditions; andat least one variable gain amplifier (VGA) for amplifying an output of the first feedback amplifier stage and supplying an RF output signal; andan AGC control system to control the gain of the LNA and for providing a scaled biased voltage for bias control.