Tuning control for a PVT-compensating tunable impedance circuit

Details Tuning control for a PVT-compensating tunable impedance circuit Tuning control for a PVT-compensating tunable impedance circuit

2007-11-27

2007-11-27

Cho, James H. (Department: 2819)

Electronic digital logic circuitry

Signal sensitivity or transmission integrity

Bus or line termination

C326S026000

Reexamination Certificate

active

11155161

ABSTRACT:
A tunable impedance circuit is provided wherein at least one of a plurality of impedance elements is combined with at least another of the plurality of impedance elements to produce a composite impedance. A control voltage is used to determine how many of the impedance elements are to be combined to produce the composite impedance. A current that is substantially invariant over a range of operating conditions is caused to flow through a control impedance to produce the control voltage.

REFERENCES:
patent: 6812735 (2004-11-01), Pham
patent: 7148720 (2006-12-01), Chen
patent: 2006/0181335 (2006-08-01), Hsu

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