Patent ID: 9252892
Filing Date: 2016-02-02
CPC Classification: G06F,H04B

Claim Text:
1. A radio frequency noise reduction device used in an electronic apparatus, the radio frequency noise reduction device comprising: a first bandpass filter adapted to receive a first signal from a first power plane where the first signal includes radio frequency noise and is referenced to chassis ground and where the first bandpass filter is further adapted to output only a first predetermined band of radio frequencies; a second bandpass filter adapted to receive a second signal from a second power plane physically isolated from the first power plane but electrically coupled to the first power plane and where the second signal is referenced to chassis ground and includes radio frequency noise and where the second bandpass filter is further adapted to output only the first predetermined band of radio frequencies; and a variable gain amplifier adapted to receive and amplify the output of the first bandpass filter and adapted to use the output of the second bandpass filter to control a gain of the variable gain amplifier wherein the output of the variable gain amplifier is connected to the second power plane and wherein the variable gain amplifier is further adapted to produce an output signal that cancels radio frequency noise on the second power plane.