Patent ID: 7634242
Filing Date: 2009-12-15
Classification: H03H

Abstract:
1. A system for implementing a tuner, said system comprising: a Radio Frequency (RF) circuit; a filter disposed in a signal path in said circuit; a first negative resistance unit in communication with said filter adapted to cancel one or more resistive elements in said filter, wherein said first negative resistance unit is adapted to cause said filter to act as an oscillator; and a frequency measurement unit in communication with said filter, wherein said frequency measurement unit is adapted to measure oscillations of said filter and to generate a number indicative of a center frequency of said filter therefrom, wherein said filter is a first filter element, said system further comprising a second filter element cascaded from said first filter element and in communication with a second negative resistance unit, wherein said second negative resistance unit is adapted to cause said second filter element to act as an oscillator, and wherein said frequency measurement unit is adapted to measure oscillations of said second filter element and to generate a number indicative of a center frequency of said second filter element therefrom.