Method of eliminating a DC component and filtering device...

Details Method of eliminating a DC component and filtering device... Method of eliminating a DC component and filtering device...

2006-06-06

2006-06-06

Contee, Joy K. (Department: 2686)

Telecommunications

Receiver or analog modulated signal frequency converter

Frequency modifying or conversion

C333S215000

Reexamination Certificate

active

07058382

ABSTRACT:
A radiotelephony device employing filters and methods for eliminating a DC component from an electronic signal provide for circuitry having a zero corresponding to a cut-off frequency, and circuitry for shifting the zero by an amount corresponding to the absolute value of that cut-off frequency. In such radiotelephony device, the filters and methods, which include integration and operation of gyrators, tend to be (a) suited for incorporation in integrated circuits by virtue of reducing the physical size of the required capacitors and (b) reduce time-dependent inertia.

REFERENCES:
patent: 3618133 (1971-11-01), Gingell
patent: 5390345 (1995-02-01), Wada et al.
patent: 5398002 (1995-03-01), Bang
patent: 5584068 (1996-12-01), Mohindra
patent: 5613234 (1997-03-01), Vella-Coleiro
patent: 5955985 (1999-09-01), Kemkemian et al.
patent: 6005506 (1999-12-01), Bazarjani et al.

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