Other

Leo Wu

John Y Ma

A TVRO receiver utilizes an improved voltage-controlled oscillator (VCO) of the surface mounted type which has a wide bandwidth of operation extending into the microwave frequency range. The VCO comprises a dielectric substrate with a patterned-metal layer on one side and a surface mounted oscillator on the patterned-metal side of the substrate. The oscillator comprises amplifying means which produce an oscillating output by the use of regenerative feedback means including an open-circuit-stub inductance formed in the patterned metal layer, and a tunable resonant circuit coupled to the amplifying means in order to control the frequency of the oscillating output. The resonant circuit includes a short-circuit-stub capacitance formed within the patterned middle layer, at least one variable capacitance diode in series with the short-circuit stub, and means for applying a controllable tuning potential to the resonant circuit.

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San Jose, CA, United States of America

Leo Wu