Title :
A broadband VCO using dielectric resonators
Author :
Kandpal, P.C. ; Ho, C.
Author_Institution :
Rockwell Int., Dallas, TX, USA
Abstract :
An approach for obtaining broadband negative resistance in designing single-port voltage controlled oscillators (VCOs) is described. The circuit uses a varactor in the feedback path to obtain a variable reactance for maximizing the negative resistance. The concept is demonstrated by designing and fabricating a circuit that oscillates in the 3.5-6.5-GHz band, depending only on the selection of the dielectric resonator. Electronic tuning for automatic frequency control is provided by a tuning varactor coupled to the tank circuit. The VCO was used in a prototype broadband downconverter for 4-6-GHz microwave digital radio.<>
Keywords :
automatic frequency control; dielectric resonators; microwave oscillators; solid-state microwave circuits; tuning; varactors; variable-frequency oscillators; 3.5 to 6.5 GHz; SHF; VFO; automatic frequency control; broadband VCO; dielectric resonators; downconverter; feedback path; microwave digital radio; microwave oscillators; negative resistance; single-port; tank circuit; tuning varactor; variable reactance; voltage controlled oscillators; Automatic frequency control; Circuit optimization; Coupling circuits; Dielectrics; Electric variables control; Feedback circuits; Negative feedback; Prototypes; Varactors; Voltage-controlled oscillators;
Conference_Titel :
Microwave Symposium Digest, 1988., IEEE MTT-S International
Conference_Location :
New York, NY, USA
DOI :
10.1109/MWSYM.1988.22108
