Voltage-controlled variable capacitor

Details Voltage-controlled variable capacitor Voltage-controlled variable capacitor

1991-08-02

1992-11-24

Howell, Janice A.

Electrical transmission or interconnection systems

Nonlinear reactor systems

Parametrons

307490, 307491, 307494, 307355, H03G 302, H03F 345

Patent

active

051665603

ABSTRACT:
An integratable temperature-stable voltage controlled capacitor circuit comprising a variable gain current amplifier connected in parallel and between a reference capacitor and an input-output port. The current amplifier reproduces the current from the reference capacitor, amplifies it, and then adds it in phase to the original current at the input/output port. The equivalent capacitance realized at the input/output port is a linear function of the current amplification and the applied control voltage. The magnitude of the current amplification is determined by a ratio of at least two bias currents applied to the amplifier from two different current sources. Since the gain is dependent on a ratio of bias currents and since temperature affects the bias currents equally when the voltage variable capacitor circuit is integrated on a single chip, this design provides for greater temperature stability.

REFERENCES:
patent: 3422369 (1969-01-01), Campbell
patent: 4147943 (1979-04-01), Peterson
patent: 4156283 (1979-05-01), Gilbert
patent: 4303894 (1981-12-01), Akazawa
patent: 4516041 (1985-05-01), Quan
patent: 4533881 (1985-08-01), Monett
patent: 4563634 (1986-01-01), Lehle
patent: 4575687 (1986-03-01), Moore, Jr.
patent: 4716315 (1987-12-01), Bell
patent: 4785250 (1988-11-01), Lawton
patent: 5021692 (1991-06-01), Hughes
patent: 5023489 (1991-06-01), Macbeth
patent: 5081423 (1992-01-01), Koyama et al.

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