Patent ID: 7689193
Filing Date: 2010-03-30
Classification: H03J

Abstract:
1. A self-aligning resonator filter circuit comprising: a tunable resonator having a filter output node; an oscillator having an oscillator output node, the oscillator being configured to generate a tuning signal at the oscillator output node; a resistance element connected between the oscillator output node and the filter output node when the self-aligning resonator filter circuit is in a tuning mode; and a phase detector loop controller coupled between the oscillator output node and the filter output node, the phase detector loop controller being configured to measure a phase difference across the resistance element, and to adjust the tunable resonator in response to the phase difference; a circuit input node; and a switch coupled to the circuit input node, the resistance element, and the filter output node, the switch being controllable to switch between a run state corresponding to a run mode for the self-aligning resonator filter circuit and a tuning state corresponding to the tuning mode; the switch being configured to disconnect the resistance element from the filter output node when the self-aligning resonator filter circuit is in the run mode, and to connect the resistance element to the filter output node when the self-aligning resonator filter circuit is in the tuning mode.