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US 7,689,193 B2Granted
Self-aligning resonator filter circuits
AssigneeFreescale Semiconductor, Inc.
InventorsDavid P. Lester, Allan P. Chin, Luciano Zoso
Life of this patent
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Abstract
An embodiment of a self-aligning resonator filter circuit includes a tunable resonator having a filter output node, an oscillator having an 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 is configured to measure a phase difference across the resistance element, and to adjust the tunable resonator in response to the phase difference.
Claims18
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.
6 more elements
A self-aligning resonator filter circuit comprising:
- a circuit input node;
- a first tunable resonator having a first 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 first resistance element connected between the oscillator output node and the first filter output node when the self-aligning resonator filter circuit is in a first tuning mode;
- a first phase detector loop controller coupled between the oscillator output node and the first filter output node, the first phase detector loop controller being configured to measure a first phase difference across the first resistance element, and to adjust the first tunable resonator in response to the first phase difference;
- and
- a first switch coupled to the circuit input node, the first resistance element, and the first filter output node, wherein the first switch is controllable to switch between a run state corresponding to a run mode for the self-aligning resonator filter circuit and a first tuning state corresponding to the first tuning mode, and wherein the first switch is configured to disconnect the first resistance element from the first filter output node when the self-aligning resonator filter circuit is in the run mode, and to connect the first resistance element to the first filter output node when the self-aligning resonator filter circuit is in the first tuning mode.
4 more elements
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, wherein the phase detector loop controller is configured to measure a phase difference across the resistance element, and to adjust the tunable resonator in response to the phase difference such that the phase difference is driven toward zero degrees;
- a circuit input node;
- and
- a switch coupled to the circuit input node, the resistance element, and the filter output node, wherein the switch is 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, and wherein the switch is 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.
5 more elements
Dependencies are inferred from the claim text.