Variable capacitance circuit, variable capacitance thin film...

Details Variable capacitance circuit, variable capacitance thin film... Variable capacitance circuit, variable capacitance thin film...

2006-02-21

2006-02-21

Ham, Seungsook (Department: 2817)

Wave transmission lines and networks

Coupling networks

Frequency domain filters utilizing only lumped parameters

C333S172000, C333S185000, C327S334000

Reexamination Certificate

active

07002435

ABSTRACT:
There is disclosed a variable capacitance circuit which comprises: first to Nth variable capacitance elements C1-CN (N is an odd number) sequentially connected in series between an input terminal I and an output terminal O, whose capacitances change depending on voltage applied thereto; an ith bias line on the input terminal side provided between an input terminal portion of the first variable capacitance element and a connection point between a 2ith variable capacitance element and a (2i+1)th variable capacitance element; and an ith bias line on the output terminal side provided between an output terminal portion of the Nth variable capacitance element and a connection point between a (2i−1)th variable capacitance element and the 2ith variable capacitance element, where N and i are integers satisfying N=2n+1, n≧1, 1≦i≦n. With the arrangement of the variable capacitance circuit, it is possible to provide a variable capacitance thin film capacitor device whose capacitance change ratio is small in a radio frequency region and large in a direct current region can be provided. Furthermore, a radio frequency device utilizing the variable capacitance thin film capacitor device can be provided.

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patent: 08-509103 (1996-09-01), None
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