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US 5,686,863 AGranted
Tunable tone control circuit and a device and method for tuning the RC constants
AssigneeDallas Semiconductor Corporation
InventorFrank A. Whiteside
Life of this patent
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Abstract
An equalizer, for providing a tunable pole/zero compensated output signal, includes a integrated tone control circuit with a MOSFET-C configuration such that the spacing between the pole and the zero and the center frequency of the pole/zero pair can be tuned by varying the resistance of MOSFET resistors using variable voltage sources applied to the gates of the MOSFETs.
Claims12
An integrated tunable control circuit for producing a compensated output characterized by a pole/zero pair, said circuit comprising:
- a. a positive input, a negative input, a positive output and a negative output;
- b. a differential operational amplifier including a positive input electrically connected to said negative input of the circuit, a negative input electrically connected to said positive input of the circuit, a positive output electrically connected to said positive output of the circuit, and a negative output electrically connected to said negative output of the circuit;
- c. means for generating a pole/zero pair, said pole/zero pair including a pole and a zero, said generating means including a first resistive element coupled between said negative output of said differential operational amplifier and said positive input of said differential operational amplifier and a second resistive element coupled between said positive output of said differential operational amplifier and said negative input of said differential operational amplifier;
- d. means for positioning said pole/zero pair about a selected frequency;
- and
- e. separation means for varying the spacing of said pole and said zero from the selected frequency.
3 more elements
Dependencies are inferred from the claim text.