Variable-reactance circuit

Details Variable-reactance circuit Variable-reactance circuit

1996-08-14

1998-09-29

Mis, David

Oscillators

Solid state active element oscillator

Transistors

331117R, 333214, H03B 512, H03H 1100

Patent

active

058150447

ABSTRACT:
A variable-reactance circuit comprising an amplifying section, a first differential section and a second differential section. The amplifying section has first to third bipolar transistors. These transistors are driven by three constant-current sources, respectively. The first differential section receives an output signal of the amplifying section. The first differential section has fourth and fifth bipolar transistors, which are driven by a first variable-current source. The second differential section receives the output signal of the amplifying section. The second differential section has sixth and seventh bipolar transistors, which are driven by a second variable-current source. The output currents of the first and second variable-current sources are controlled by two control signals, respectively.

REFERENCES:
patent: 4553107 (1985-11-01), Ogawa
patent: 5030927 (1991-07-01), Itoh

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