Apparatus for attenuating low frequency signals

Details Apparatus for attenuating low frequency signals Apparatus for attenuating low frequency signals

2009-03-30

2011-12-13

Le, Dinh T. (Department: 2816)

Miscellaneous active electrical nonlinear devices, circuits, and

Specific identifiable device, circuit, or system

Unwanted signal suppression

C327S552000, C327S559000

Reexamination Certificate

active

08076969

ABSTRACT:
A high pass filter has a cutoff frequency. The high pass filter includes a first amplifier to receive an input signal. The high pass filter attenuates low frequency signals of the input signal that are below the cutoff frequency. A second amplifier provides an output signal. The output signal comprising only high frequency signals of the input signal that are above the cutoff frequency. A capacitive element is coupled in between the first amplifier and the second amplifier. A variable frequency module controls a plurality of resistive paths of the high pass filter. Each resistive path corresponds to a different cutoff frequency for the high pass filter. The variable frequency module is configured to prevent any leakage current from draining the capacitive element.

REFERENCES:
patent: 4589136 (1986-05-01), Poldy et al.
patent: 5760642 (1998-06-01), Yada
patent: 6496341 (2002-12-01), Chen et al.
patent: 7317601 (2008-01-01), Chen
patent: 7440209 (2008-10-01), Sutardja

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