Quenchable VCO for switched band synthesizer applications

Details Quenchable VCO for switched band synthesizer applications Quenchable VCO for switched band synthesizer applications

1997-06-16

2000-06-06

Kinkead, Arnold

Oscillators

Plural oscillators

Selectively connected to common output or oscillator...

331179, 331117D, 331117R, H03B 500, H03B 512

Patent

active

060723718

ABSTRACT:
A quenchable VCO that is adapted to be used in switched band synthesizer applications. The VCO may be formed from a heterojunction bipolar transistor (HBT) in a common collector configuration. A quenching circuit which includes a p-i-n diode, is electrically coupled in series with the collector of the HBT. The p-i-n diode is adapted to be monolithically integrated with the HBT. Since the p-i-n diode is electrically connected to the collector of the HBT, as opposed to the base and emitter terminals of the HBT, which forms the main oscillator feedback loop, the Q-factor of the p-i-n diode will have relatively less loading on the phase noise of the HBT oscillator. Moreover, since the p-i-n diode is isolated from the base-emitter junction, the configuration will result in reduced frequency pulling and generation of spurious oscillation and transient effects due to the switching of the p-i-n diode quenched circuit. The use of a p-i-n diode for quenching of VCO also provides other inherent advantages over other types of semi-conductor switches, such as FET, Schottky diodes, PN diodes for quenchable VCO applications because p-i-n diodes are relative insensitive to RF and noise modulation. Because the p-i-n diode can be constructed from existing HBT collector-base MBE epitaxy layers, the quenching circuit can be manufactured relatively inexpensively.

REFERENCES:
patent: 4688004 (1987-08-01), Hirai et al.
patent: 4755772 (1988-07-01), Khanna
patent: 5686864 (1997-11-01), Martin et al.
patent: 5852384 (1998-12-01), Sakakura et al.
K.K. Agarwal, "Dielectric Resonator Oscillators Using GaAs/(Ga,A1)As Heterjunction Bipolar Transistors," 1986 IEEE MTT Symp. Dig., Baltimore, MD, pp. 95-98.
N. Hayama, et al., "A Low-Noise Ku-Band A1GaAs/GaAs HBT Oscillator," 1988 IEEE MTT Symp. Dig., New York, NY, pp. 679-682.
G. Dietz, "A 10-14 Ghz Quenchable MMIC Oscillator," 1991 IEEE MTT Symp. Dig., Boston, MA, pp. 23-26.

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