Voltage controlled oscillator with improved tuning linearity

Details Voltage controlled oscillator with improved tuning linearity Voltage controlled oscillator with improved tuning linearity

1995-06-20

1996-10-15

Mis, David

Oscillators

Solid state active element oscillator

Transistors

331 36C, 331 96, 331175, 331177V, H03B 518

Patent

active

055658210

ABSTRACT:
The object of the invention is a voltage controlled oscillator with improved tuning linearity, which comprises an oscillating transistor (T, 1), a resonator circuit (C11, C12, 11, 12, 19, 20) formed by a capacitance diode (D, 20) and an inductance (L1, 19), whereby the resonator circuit is connected to one of the transistor's (T, 1) electrodes and defines together with the transistor's internal capacitance and external capacitances the oscillator output frequency provided by the transistor. The output frequency can be changed with an external control voltage (V.sub.cntrl) supplied to the cathode of the capacitance diode (D, 20), the control voltage having minimum and maximum values, whereby the oscillator output frequency (f.sub.vco) is arranged to change within a certain frequency band in accordance with the control voltage (V.sub.cntrl). The resonance circuit (RES) is arranged at the current draining electrode (collector) of the transistor to have an effect on the linearity between the control voltage (V.sub.cntrl) and the output frequency (f.sub.vco). The resonance circuit according to the invention provides an approximately linear tuning sensitivity also at low control voltages.

REFERENCES:
patent: 3582823 (1971-06-01), Pasos
patent: 4492934 (1985-01-01), Sugimoto
patent: 5357222 (1994-12-01), Hietala
patent: 5373264 (1994-12-01), Higgins, Jr.
Finnish Office Action and English Translation thereof, dated 15 Mar. 1995, Nokia Mobile Phones Ltd., Application No. 942996.

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