Circuit device for filtering or impedance matching

Details Circuit device for filtering or impedance matching Circuit device for filtering or impedance matching

2006-09-18

2008-12-30

Donovan, Lincoln (Department: 2816)

Miscellaneous active electrical nonlinear devices, circuits, and

Specific identifiable device, circuit, or system

Unwanted signal suppression

C327S311000, C333S017300, C455S307000

Reexamination Certificate

active

07471140

ABSTRACT:
A circuit device has a passive network (101) with an input (109) and an output, the output of the passive network (101) forming an output terminal (103) of the circuit device and a feedback path coupling the output terminal (103) of the circuit device to the input (109) of the passive network (101), the feedback path having an amplifier (107) configured to adjust an attenuation of the circuit device.

REFERENCES:
patent: 5708573 (1998-01-01), Lusher et al.
patent: 6204715 (2001-03-01), Sellnau et al.
patent: 6469562 (2002-10-01), Shih et al.
patent: 6737911 (2004-05-01), Ausserlechner
patent: 7212068 (2007-05-01), Onody
patent: 2004/0155702 (2004-08-01), Danielsson
Sallen et al., A Practical Method of Designing RC Active Filters, IRE Transactions-Circuit Theory, p. 74-85, 1955, Mar. 1955.
Weldon et al., A 1.75-GHz Highly Integrated Narrow-Band CMOS Transmitter with Harmonic-Rejection Mixers, IEEE Journal of Solid-State Circuits, vol. 36, No. 12, pp. 2003-2015, Dec. 2001.

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