Abstract An oscillation circuit includes as its principal components a Clapp capacitor and two feedback capacitors connected to each other and a resonance coil. A first series circuit including a first variable-capacitance diode and a first DC cutoff capacitor is connected in parallel with the resonance coil, while a second series circuit including a second variable-capacitance diode and a second DC cutoff capacitor is connected to a first diode such that a certain polarity terminal of the second variable-capacitance is faced against the same polarity terminal of the first diode. One end of the second DC cutoff capacitor in the second series circuit is connected to the one of the feedback capacitors. Furthermore, means is provided at the joint of the first variable-capacitance diode and the first DC cutoff capacitor for applying a DC voltage to enable the first and second variable-capacitance diodes.
An oscillation circuit includes as its principal components Clapp capacitor means, amplifier means, two feedback capacitor means connected to each other and resonance coil means, said oscillation circuit comprising: first variable-capacitance diode means; first capacitor means, to form first series circuit including the first variable-capacitance diode means and the first capacitor means, is connected in parallel with the resonance coil means; second variable-capacitance diode means; second capacitor means to form second series circuit including the second variable-capacitance diode means and the second capacitor means; and means for applying a voltage to enable the first and the second diode means, wherein one end of the second diode means of the second series circuit is connected to the first diode means such that a certain polarity terminal of the second diode means is faced against the same polarity terminal of the first diode means, and one end of the second capacitor means of the second series circuit is connected with the feedback capacitor means connected to the Clapp capacitor means.
Claim 2
Dependent Claim
168 words
An oscillation circuit includes as its principal components Clapp capacitor means, amplifier means, two feedback capacitor means connected to each other and resonance coil means, said oscillation circuit comprising: first variable-capacitance diode means; first capacitor means, to form first series circuit including the first variable-capacitance diode means and the first capacitor means, is connected in parallel with the resonance coil means; second variable-capacitance diode means; second capacitor means to form second series circuit including the second variable-capacitance diode means and the second capacitor means; and means for applying a voltage to enable the first and the second diode means, wherein one end of the second diode means of the second series circuit is connected to the first diode means such that a certain polarity terminal of the second diode means is faced against the same polarity terminal of the first diode means, and one end of the second capacitor means of the second series circuit is connected with the feedback capacitor means connected to the Clapp capacitor means.