Oscillators – Solid state active element oscillator – Transistors
Patent
1991-09-04
1992-07-14
Mis, David
Oscillators
Solid state active element oscillator
Transistors
331 36C, 331 99, 331117FE, 331177V, H03B 518, H03L 7099
Patent
active
051306751
ABSTRACT:
A voltage-controlled oscillator according to the present invention comprises: a transistor, where the drain electrode is grounded, the gate electrode is connected to a resonator whose resonant frequency is adjustable according to a voltage applied to a voltage-dependent capacitance diode electromagnetically coupled with the resonator, an output signal is output from the source electrode; a resistor connected in gate bias circuit or source voltage supply circuit for detecting a low-frequency noise component generated in the transistor, where the detected low-frequency noise component is amplified and fed back to the voltage-dependent capacitance diode so as to cancel a phase-noise component generated in the voltage-controlled oscillator. The above-described voltage-controlled oscillator may be further provided with a reference crystal oscillator to which the voltage-controlled oscillator is phase-locked. Thus, a microwave voltage-controlled oscillator excellent in phase-noise characteristics of the oscillated frequency is accomplished though there is employed a GaAs FET which is not good in a low-frequency noise characteristic.
REFERENCES:
patent: 4630004 (1986-12-01), Niehenke et al.
"The GAAS FET Oscillator--Its Signal and Noise Performance", Institute of Electrical and Electronics Engineers Proceedings of the 40th Annula Frequency Symposium, 1986.
"An Ultra-Low Noise Microwave Synthesizer", IEEE Transactions on Microwave Theory and Techniques, vol. 27, No. 12, Dec. 1979.
Patent Abstracts of Japan, vol. 014, No. 461 (E-987) Oct. 5, 1990.
Fujitsu Limited
Mis David
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