Linear tuning circuit and tuning method thereof

Details Linear tuning circuit and tuning method thereof Linear tuning circuit and tuning method thereof

2006-03-07

2006-03-07

Chang, Joseph (Department: 2817)

Tuners

Tuner unit directly responsive to voltage and/or current...

Reactance tuning

C331S1170FE

Reexamination Certificate

active

07009472

ABSTRACT:
A linear tuning varactor circuit has the first single-end varactor circuit, the second single-end varactor circuit and a voltage divider. The first single-end varactor circuit has tuning terminal receiving the tuning voltage to change the capacitance thereof The second single-end varactor circuit has a reference voltage terminal receiving the reference with constant voltage. The first single-end varactor circuit and the second single-end varactor circuit are coupled to each other in series and have a node. The voltage divider is coupled to the tuning terminal, the reference voltage terminal and the node. The node has a divided voltage, which results from dividing a voltage difference between the tuning voltage and the reference voltage by the voltage divider with a pre-set voltage dividing ratio.

REFERENCES:
patent: 6469587 (2002-10-01), Scoggins
patent: 6833769 (2004-12-01), Seppinen et al.

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