Voltage-controlled oscillator having three or more varactor diodes
First Claim
1. A voltage-controlled oscillator having a non-switching continuous frequency band, comprising:
- (a) an oscillating circuit;
(b) a series circuit of a coupling capacitor and a resonant circuit coil, connected to said oscillating circuit;
(c) a series circuit of three or more varactors, which series circuit is connected via said series circuit of said coupling capacitor and said resonant circuit coil to said oscillating circuit so far as to form a series resonant circuit; and
(d) means for supplying a D.C. bias voltage to each of said varactors.
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Accused Products
Abstract
In a voltage-controlled oscillator having an LC resonant circuit including a varactor circuit so that resonant frequency is controlled by a D.C. bias or control voltage applied to the varactor circuit, three or more varactors are connected in series in one embodiment so that a high-frequency voltage applied to the varactor circuit is divided into a plurality. The varactors may be connected in the same direction or opposite direction. In another embodiment, a plurality of series circuits of varactors are connected in parallel to provide the varactor circuit, where each series circuit comprises two or more varactors. A series-parallel connection of a plurality of varactors may be arranged in a matrix. In order to reduce undesirable stray capacitance, some or all varactors are attached to a printed circuit board so that they are normal to the plane of the printed circuit board. In one embodiment an auxiliary printed circuit board is employed so that some varactors are spaced from a main circuit board. The voltage-controlled oscillator of the invention shows high carrier-to-noise ratio throughout a wide frequency range.
23 Citations
11 Claims
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1. A voltage-controlled oscillator having a non-switching continuous frequency band, comprising:
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(a) an oscillating circuit; (b) a series circuit of a coupling capacitor and a resonant circuit coil, connected to said oscillating circuit; (c) a series circuit of three or more varactors, which series circuit is connected via said series circuit of said coupling capacitor and said resonant circuit coil to said oscillating circuit so far as to form a series resonant circuit; and (d) means for supplying a D.C. bias voltage to each of said varactors. - View Dependent Claims (2, 3, 4, 5)
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6. A voltage controlled oscillator having a non-switching continuous frequency band, comprising:
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(a) an oscillating circuit; (b) a series circuit of a coupling capacitor and a resonant circuit coil, connected to said oscillating circuit; (c) a parallel circuit of varactors, having one branch including a series connection of at least two varactors, which parallel circuit is connected via said series circuit of said coupling capacitor and said resonant circuit coil to said oscillating circuit so as to form a series resonant circuit; and (d) means for supplying a D.C. bias voltage to each of said varactors constituting said parallel circuit. - View Dependent Claims (7, 8, 9)
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10. A voltage controlled oscillator having a non-switching continuous frequency band, comprising:
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(a) an oscillating circuit; (b) a series circuit of a coupling capacitor and a resonant circuit coil, connected to said oscillating circuit; (c) a matrix of a plurality of varactors, said matrix having a plurality of rows each having a series circuit of two or more varactors, said plurality of rows being connected in parallel, said matrix being connected via said series circuit of said coupling capacitors and said resonant coil to said oscillating circuit so as to form a series resonant circuit; and (d) means for supplying a D.C. bias voltage to each of said varactors constituting said matrix. - View Dependent Claims (11)
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Specification