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US 6,288,611 B1Granted
Apparatus and method to trim a programmable low-frequency monolithic high-pass filter
AssigneeTexas Instruments Incorporated
InventorMehmet Ali Tan
Life of this patent
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Abstract
A high-pass filter has a variable resistance which can be varied by a trimming signal and a programming signal. The variable resistance has a common resistance which is controlled by the trimming signal or the programming signal through a common control line.
Claims4
A high-pass filter comprising:
- a variable resistance having a resistance which can be varied;
- a capacitor coupled to an output of said variable resistance;
- and
- an operational amplifier coupled to said output of said variable resistance and said capacitor;
- wherein said variable resistance may be varied in accordance with a discrete trimming signal and a discrete programming signal;
- wherein said trimming signal and said programming signal are summed together by an adder circuit.
3 more elements
Dependencies are inferred from the claim text.