Millimeter wave, lumped element, VCO with ultrabroadband tuning

Oscillators – Combined with particular output coupling network – Wave filter

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Details

331 96, 331107DP, 331107G, 331177V, H03B 912

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active

049739212

ABSTRACT:
A varactor tuned oscillator (10), VCO, operational in the millimeter wave range including frequencies greater than 30 GHz, includes a lumped element active circuit (12) with a negative resistance, a lumped element tuning circuit (16) coupled to the active circuit and providing resonant circuitry in combination therewith, and a VCO output (26) reactively terminated at the fundamental frequency of oscillation and generating a higher order output harmonic at least as high as the second order. The reactive termination at fundamental frequency eliminates the intrinsic diminishing effect on tuning range of resistive loading, to extend tuning range and provide an ultrabroadband VCO. The VCO output (26) is resistively loaded at the higher order harmonic. The output is obtained from the higher order harmonic generated in-situ in the active element (14). Measured performance included continuous tuning from 46 to 66 GHz, a 20 GHz tuning range, with a maximum power output of +6 dBm.

REFERENCES:
patent: 4025881 (1977-05-01), Cohen et al.
patent: 4246550 (1981-01-01), Cohen
patent: 4728907 (1988-03-01), Cohen
"Wide Range Tuning of Solid State Microwave Oscillators", D. Cawsey, IEEE Journal of Solid State Circuits, Apr. 1970, pp. 82-84.
"FM and AM Noise in Microwave Oscillators", S. Hamilton, Microwave Journal, Jun. 1978, pp. 105-109.
"Varactor Tuned Gunn Oscillators with Wide Tuning Range for the 25 to 75 GHz Frequency Band", L. Cohen, IEEE-MIT-S International Microwave Symposium, Apr. 1979.
"A Wideband, Backshort-Tunable Second Harmonic W Band Gunn Oscillator", H. Barth, 1981 IEEE MIT-S Symposium Digest, pp. 334-337.
"Active Phase Shifters for the Millimeter and Microwave Bands", L. Cohen, 1984 IEEE MIT-S Digest; pp. 397-399.
"Wideband Electronically Tunable GaAs Gunn VCO's at W-Band (75-110 GHz)", J. Ondria, 1985 IEEE MIT-S Symposium Digest, pp. 375-378.
"Frequency/Temperature Compensated Millimeter-Wave Oscillators and Broadband VCO's in Lumped-Element and Printed-Circuit Forms", L. Cohen et al., 1986 IEEE MIT-S International Microwave Symposium Digest, pp. 169-172.
Avantek Product Guide Catalog, 1987, p. 67.
"Recent Advances in the Modelling and Performance of Millimeter Wave InP and GaAs Gunn VCO's and Oscillators", L. Cohen and E. Sard, 1987 IEEE-MIT-S International Microwave Symposium Digest, pp. 429-432.
"4 to 40 GHz Even Harmonic Schottky Mixer", J. Merenda et al., 1988 IEEE MIT-S International Microwave Symposium Digest, pp. 695-698.
"CMW Series Wideband Electronically-Tuned Gunn Oscillators", Central Microwave Company, Maryland Heights, Mo., Jun. 1988.
"Millimeter Wave, Lumped Element Gunn VCO's with Ultrawide-band (20 GHz) Tuning", L. Cohen and E. Sard, 1989 IEEE-S International Microwave Symposium, Jun. 13-15 1989.
"Microwave Oscillator Circuits", S. Hamilton, Microwave Journal, Apr. 1978, pp. 63-66 and 84.

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