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US 2006/0066392 A1Published application
Method and apparatus for tuning GMC filter
AssigneeSilicon Laboratories Inc.
InventorsGolam Chowdhury, Douglas Holberg
Life of this patent
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Abstract
A system and method for providing a tunable GMC filter is disclosed wherein a transconducted element having an attenuator in a feedback loop therewith is allowed to oscillate at a first oscillation frequency. An input to the filter enables tuning of the oscillation frequency to a pre-determined frequency.
Claims22
A tunable GMC filter, comprising:
- a transconductance element;
- an attenuator connected in a negative feedback loop with the transconductance element, wherein the transconductance element and the attenuator form an oscillation circuit having an oscillation frequency;
- and
- an input for receiving a current for tuning the oscillation frequency of the transconductance element to a predetermined frequency.
1 more element
A tunable GMC filter, comprising:
- a transconductance element;
- an attenuator connected in a negative feedback loop with the transconductance element, wherein the transconductance element and the attenuator form an oscillation circuit having an oscillation frequency;
- an input for receiving a current for tuning the oscillation frequency of the transconductance element to a predetermined frequency;
- a comparator for driving an output of the transconductance element between a first level and a second level;
- and
- a current generator for generating the current applied to the input, the generated current responsive to a frequency of the output of the comparator.
3 more elements
A method for tuning a GMC filter, comprising the steps of:
- allowing the GMC filter to oscillate at an oscillation frequency;
- determining a difference between the oscillation frequency and a predetermined frequency;
- and
- providing a tuning current to the GMC filter responsive to the determined difference.
1 more element
Dependencies are inferred from the claim text.