Tuning circuit for an RC filter

Details Tuning circuit for an RC filter Tuning circuit for an RC filter

1994-07-01

1997-04-29

Callahan, Timothy P.

Miscellaneous active electrical nonlinear devices, circuits, and

Specific identifiable device, circuit, or system

Unwanted signal suppression

327362, 327539, 330305, 333173, G25F 302, H03K 500

Patent

active

056253168

ABSTRACT:
A tuning circuit (202) uses a precision current reference (Iref) along with an analog-to-digital converter (218) to produce a digital output (228) to represent variations of internal resistance values. The precision current reference (Iref) is fed to an internal tuning resistor (R210) in order to provide an analog voltage signal to the analog-to-digital converter (218). The analog voltage signal changes in accordance with the variations in the tuning resistor value over process and temperature. The digital output (228) controls programmable capacitor arrays (C220, C222) which are included in the tuning circuit (202) as well as in an active RC filter (208) whose bandwidth is controlled by the programmable capacitor arrays (C220, C222) and internal resistors (R212, R214, R216).

REFERENCES:
patent: 4306203 (1981-12-01), Sasaki et al.
patent: 4691121 (1987-09-01), Van Roermund et al.
patent: 4851719 (1989-07-01), Hitomi
patent: 5331217 (1994-07-01), Moody et al.
patent: 5359552 (1994-10-01), Dhong et al
Gyrator Video Filter IC With Automatic Tuning, IEEE Journal of Solid-State Circuits, vol. SC-15, No. 6, Dec. 1980.

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