Tuning circuit

Details Tuning circuit Tuning circuit

2006-06-21

2008-12-09

Le, Dinh T. (Department: 2816)

Miscellaneous active electrical nonlinear devices, circuits, and

Specific identifiable device, circuit, or system

Unwanted signal suppression

C327S552000

Reexamination Certificate

active

07463085

ABSTRACT:
The present invention relates to a filter and, more particularly, to a tuning circuit of a filter for correcting a cut-off frequency of the filter. The tuning circuit comprises a current generation unit having a first transistor and a variable resistor unit, and a capacitance correction unit having a second transistor, a capacitor unit, an up-down counter and a selection unit for selecting a control path of the up-down counter for varying the resistance or capacitance.

REFERENCES:
patent: 6577114 (2003-06-01), Roo
patent: 6842710 (2005-01-01), Gehring et al.
patent: 6862714 (2005-03-01), Jin et al.
patent: 7002404 (2006-02-01), Gaggl et al.
patent: 2004/0169565 (2004-09-01), Gaggl et al.
patent: 2004-0169565 (1992-06-01), None
patent: 408122845 (1996-05-01), None

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