Patent ID: 7408594
Filing Date: 2008-08-05
Classification: H04B

Abstract:
1. A method of automatically switching on/off a low noise amplifier (LNA) that serves to boost weak video signals in a TV tuner ( 2 ), the method comprising: (a) determining ( (b) if the determination in step (a) is negative, switching off said LNA ( (c) if the determination in step (a) is positive, determining ( (d) if the determination in step (c) is negative, switching off said LNA ( (e) if the determination in step (c) is positive, switching on said LNA ( (f) measuring a change in signal-to-noise ratio of the LNA-amplified tuned-in signal after switching on said LNA in step (e), and (g) if said measured change in step (f) is an increase and exceeds a predetermined threshold (