Oscillators – Solid state active element oscillator – Transistors
Patent
1989-10-18
1990-12-04
Pascal, Robert J.
Oscillators
Solid state active element oscillator
Transistors
331177R, H03B 524
Patent
active
049756621
ABSTRACT:
A voltage controlled oscillator (VCO) circuit includes a current mirror circuit section and oscillator circuit section to provide an oscillation frequency based on the output current of the current mirror circuit section. To vary the oscillation over a wide range, a fixed reference voltage circuit is connected to the current mirror circuit, and either a source follower circuit made of a MOSFET or a FET or an emitter follower circuit made of a bipolar transistor is included is also connected to the current mirror circuit to selectively varying the output current of the current mirror circuit section upon application of a control voltage applied to the follower circuit. Thus, the follower circuit is controlled by a control voltage while the output current of the current mirror circuit varies depending on the magnitude of the control voltage, and, in turn, the oscillating frequency of the oscillator circuit section varies over a wide frequency range, e.g., in excess of 100 dB, in accordance with the output current.
REFERENCES:
patent: 3610954 (1970-10-01), Treadway
patent: 4623851 (1986-11-01), Abou
Carothers, Jr. W. Douglas
Pascal Robert J.
Seiko Epson Corporation
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