Band pass filter

Details Band pass filter Band pass filter

2006-07-25

2006-07-25

Le, Dinh T. (Department: 2816)

Miscellaneous active electrical nonlinear devices, circuits, and

Specific identifiable device, circuit, or system

Unwanted signal suppression

C327S557000

Reexamination Certificate

active

07081788

ABSTRACT:
A band pass filter includes a first band pass filter constructed of a biquad circuit and having a first center frequency, and a second bandpass filter constructed of a biquad circuit and having a second center frequency different from the first center frequency, and the first band pass filter and the second band pass filter are series connected, in which the first band pass filter and the second band pass filter have center frequency adjusting variable resistors varied at the same time, and a fixed resistor is connected in parallel to the center frequency adjusting variable resistor of one of the first band pass filter and the second band pass filter. As a result, the center frequency and/or the maximum gain can be made variable while the band width is fixed.

REFERENCES:
patent: 6057723 (2000-05-01), Yamaji et al.
patent: 6161425 (2000-12-01), Junker et al.
patent: 6791401 (2004-09-01), Miwa
M. E. Van Valkenburg, Analog Filter Design ,“Chapter 5, Chapter 7, Chapter 17”, Holt, Rinehart and Winston, 1982.

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