Voltage controlled oscillator having a current mirror circuit as

Details Voltage controlled oscillator having a current mirror circuit as Voltage controlled oscillator having a current mirror circuit as

1994-04-26

1995-11-14

Mis, David

Oscillators

Combined with particular output coupling network

331 34, 331 57, 331177R, 331182, H03B 500, H03B 524, H03L 7099

Patent

active

054670608

ABSTRACT:
A voltage controlled oscillator circuit is provided with a voltage controlled current source supplying a first current which is controlled responsive to a control voltage; and a current mirror circuit including input side circuit means and output side circuit means. The input side circuit means receives the first current from the voltage controlled current source. The claimed voltage controlled oscillator circuit further includes an oscillator circuit using the output side circuit means of the current mirror circuit as current source means and having an oscillation frequency which is controlled responsive to a second current of the output side circuit means; and an output circuit obtaining an oscillation output of the oscillator circuit. The oscillation output of the oscillator includes complementary outputs, wherein the output circuit includes two source follower circuits coupled to the complementary outputs, two pseudo resistor circuits, and another current mirror circuit, and wherein the two source follower circuits are respectively coupled to input side means and output side means of the another current mirror circuit through the pseudo resistor circuits, and the output is obtained from between the output side means of the another current mirror circuit and the source follower circuit.

REFERENCES:
patent: 5061907 (1991-10-01), Rasmussen
patent: 5075640 (1991-12-01), Miyazawa
patent: 5105169 (1992-04-01), Yamazaki et al.
patent: 5142249 (1992-08-01), Hirotomi

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