Tunable active filter

Details Tunable active filter Tunable active filter

H - Electricity

03

F

330/103, 333/51

H03F 1/34 (2006.01) H03G 5/00 (2006.01) H03H 11/12 (2006.01)

Patent

CA 1206543

- 11 - TUNABLE ACTIVE FILTER Abstract A tunable high-pass or low-pass filter employs a balanced amplifier having electronically controlled resistance elements in either two input or two feedback paths (or both). A reactive element is placed in each of the other pair of paths. Especially low distortion results from this arrangement, allowing convenient integrated circuit implementation with a nonlinear device (e.g., MOS transistor) as a voltage-controllable element. Multiple stages can be cascaded and controlled from a reference clock or other precision source for high accuracy.

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