Filter circuit

Details Filter circuit Filter circuit

2006-01-24

2008-12-30

Le, Dinh T. (Department: 2816)

Miscellaneous active electrical nonlinear devices, circuits, and

Specific identifiable device, circuit, or system

Unwanted signal suppression

C327S558000

Reexamination Certificate

active

07471141

ABSTRACT:
Disclosed is a filter circuit with an order of three or more, comprising at least one means for amplifying an in-band signal, wherein the frequency response of the filter output has a desirable attenuation characteristic obtainable with the order of the filter circuit. The gain of the amplifying means is variably controlled.

REFERENCES:
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patent: 5230011 (1993-07-01), Gielis et al.
patent: 5564089 (1996-10-01), Barrett, Jr.
patent: 5602847 (1997-02-01), Pagano et al.
patent: 5614860 (1997-03-01), Osaki et al.
patent: 5887030 (1999-03-01), Sasaki et al.
patent: 6011770 (2000-01-01), Tan
patent: 6791401 (2004-09-01), Miwa
C. Shi et al., “Design of a Low-Power CMOS Baseband Circuit for Wideband CDMA Testbed,” Proceedings of International Symposium on Low Power Electronics and Design (ISLPED 2000), Jul. 26-27, 2000, pp. 222-224, Figure 1.

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