Oscillators – Solid state active element oscillator – Transistors
Patent
1982-02-05
1985-01-08
LaRoche, Eugene R.
Oscillators
Solid state active element oscillator
Transistors
331168, 331177R, H03B 504, H03B 512
Patent
active
044929340
ABSTRACT:
A voltage controlled oscillator is provided with an LC parallel resonance circuit connected to the collector of one of a differential pair of transistors, and an amplifier and a capacitor which are connected between the collector of the one transistor and the base of the other transistor. The bases of the differential pair of transistors are equally biased. The emitters of the transistors are connected to a variable current source. The variable current source produces a current proportional to the square of control voltage. The frequency of the VCO can be changed by the control voltage with good linearity over a wide dynamic range. The variable current source causes the VCO characteristic to be linear. The value of the capacitor can be small, making the oscillator circuit well suited for integrated circuit fabrication.
REFERENCES:
patent: 3963996 (1976-06-01), Skerlos
patent: 3986145 (1976-10-01), Hongu et al.
patent: 4061987 (1977-12-01), Nagahama
patent: 4063193 (1977-12-01), Wilcox
patent: 4169248 (1979-09-01), Hongu et al.
patent: 4270102 (1981-05-01), Gawler et al.
Barnes, A. "L-C Oscillator With Stable Output Level" New Electronics, (6B) vol. 10, #10 (17 May 1977) p. 44.
LaRoche Eugene R.
Mis D. C.
Tokyo Shibaura Denki Kabushiki Kaisha
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