High-power low-noise voltage-controlled oscillator

Details High-power low-noise voltage-controlled oscillator High-power low-noise voltage-controlled oscillator

1995-02-28

1998-02-03

Pascal, Robert

Oscillators

Solid state active element oscillator

Transistors

331175, 331177V, 331108R, H03B 512

Patent

active

057149143

ABSTRACT:
A high power, low noise voltage-controlled oscillator (VCO) eliminates the drive-stage amplifier and costly surface-acoustic wave (SAW) inter-stage filter in a transmitter such as a cellular radiotelephone. The VCO includes a resonant circuit, an active part connected to the resonant circuit, and a buffer amplifier, connected to the active part, for isolating the VCO from a load connected to the buffer amplifier. The active part includes at least one transistor in a Colpitts configuration; capacitances connected in parallel with junction capacitances of the transistor, each capacitance having a value that is greater than a value of the respective junction capacitance with which it is connected in parallel; and a resistance for providing negative feedback at low frequencies. A second resistance may be provided for reducing the gain of the active part when oscillation starts. The buffer amplifier is a linear amplifier including a transistor, and the active part and the buffer amplifier may be connected by a capacitance for reducing coupling between the active part and the buffer amplifier.

REFERENCES:
patent: 4134085 (1979-01-01), Driscoll et al.
patent: 4511861 (1985-04-01), Bell
patent: 4571557 (1986-02-01), Brandt
patent: 4590443 (1986-05-01), Ishigaki et al.
patent: 4593255 (1986-06-01), Matsuura
patent: 5144264 (1992-09-01), Chong et al.
patent: 5160902 (1992-11-01), Saeki et al.
"Balanced Meissner Oscillator Circuits" by Nickdemma, RF Design, Dec. 1993, pp. 72-74.
J. L.H. OOI, "Low Voltage VCO with Differential Control Voltage for Wideband Tuning," Motorola Technical Developments, vol. 9, p. 75 (Aug. 1989).
Y. Tarusawa et al., "Low-Noise 2-GHz-Band VCO Implementation for Frequency Synthesizers Used in Land Mobile Radio," Transactions of the Institute of Electronics, Information and Communication Engineers of Japan, vol. E72, No. 10, pp. 1111-1118 (Oct. 1, 1989).

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