Computer Science
Scientific paper
Jan 1976
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976itmtt..24...31c&link_type=abstract
IEEE Transactions on Microwave Theory and Techniques, vol. MTT-24, Jan. 1976, p. 31-39. Research supported by the Science Resear
Computer Science
Broadband, Gunn Diodes, Microwave Oscillators, Reactance, Tuning, Varactor Diodes, Capacitance, Concentric Cylinders, Design Analysis, Electrical Impedance, Electronic Packaging, Frequency Response, Microwave Coupling, Q Factors
Scientific paper
An experimental investigation into the effects of package and circuit reactances on wide-band varactor-tuned oscillators is described. The results are used to design an X-band Gunn coaxial oscillator with a tuning range in excess of 3 GHz. It is shown that the stray reactances, junction capacitance, and bond-wire inductance affect the varactor tuning characteristics. The characteristics are conveniently displayed by the reflection phase variation with tuning voltage and frequency. A general theory for wide-band varactor-tuned oscillators is presented which is related to the impedance characteristics. These results are used to design three coaxial varactor-tuned oscillators. The first two oscillators are series arrangements, while the third is a parallel arrangement. A simple circuit technique is employed to improve the tuning range of each arrangement. This technique is shown to increase the coupling to the varactor diode and decrease the oscillator Q by reactance compensation.
Corbey C. D.
Davies Richard
Gough R. A.
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