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US 7,064,557 B2Granted
Calibration circuit and method for filter bandwidth which is parasitic capacitance sensitive or insensitive
AssigneeBroadcom Corporation
InventorsMeng-An Pan, Stephen Wu
Life of this patent
Estimating the term…
Abstract
A calibration circuit and method causes a cutoff frequency to match the design frequency of low pass filter by adjusting a capacitor array in the low pass filter.
Claims16
A method, comprising:
- measuring a difference in voltage between a first and second element of a filter when an equal current is applied to both elements;
- and
- adjusting at least one of the first or second elements if there is a measured difference in voltage, wherein the adjusting causes a characteristic of the filter to more closely match a design characteristic of the filter.
A system, comprising:
- means for measuring a difference in voltage between a first and second element of a filter when an equal current is applied to both elements;
- and
- means for adjusting at least one of the first or second elements if there is a measured difference in voltage, wherein the adjusting causes a characteristic of the filter to more closely match a design characteristic of the filter.
A system, comprising:
- a comparator capable of measuring a difference in voltage between a first and second element of a filter when an equal current is applied to both elements;
- and
- an engine, communicatively coupled to at least one of the first and second elements and communicatively coupled to the comparator, capable of adjusting at least one of the first or second elements if there is a measured difference in voltage, wherein the adjusting causes a characteristic of the filter to more closely match a design characteristic of the filter.
Dependencies are inferred from the claim text.