Oscillators – Solid state active element oscillator – Transistors
Patent
1986-12-19
1988-05-17
Grimm, Siegfried H.
Oscillators
Solid state active element oscillator
Transistors
331177R, H03B 536
Patent
active
047453753
ABSTRACT:
A variable frequency circuit for generating a frequency output variable in response to a control signal. The variable frequency circuit includes a ceramic resonator, an exciting amplifier for exciting an oscillation in the ceramic resonator, a first current supplying circuit for supplying a driving current to the exciting amplifier, a variable reactance circuit connected in parallel to the ceramic resonator, the variable reactance circuit operating as an equivalent reactance, a second current supplying circuit responsive to the control signal for supplying a variable driving current to the variable reactance circuit, and a coupling circuit for coupling the first current supplying circuit and the second current supplying circuit together for controlling the driving current of the first current supplying circuit in response to the variable driving current of the second current supplying circuit.
REFERENCES:
patent: 3986145 (1976-10-01), Hongu et al.
patent: 4581593 (1986-04-01), Okanobu
patent: 4587500 (1986-05-01), Tanaka et al.
Nikkei Electronics, pp. 141-163, Jan. 30, 1984.
Grimm Siegfried H.
Kabushiki Kaisha Toshiba
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