Resonant circuit and a voltage-controlled oscillator
First Claim
1. A resonant circuit, comprising;
- an induction element; and
a MOS variable capacitance element connected in parallel with said induction element, whereinsaid MOS variable capacitance element is divided into a plurality of elements which are connected in parallel with each other, and a plurality of bias terminals are provided for applying staircase different-step DC bias voltages respectively to gates of MOS transistors constituting the plural divided MOS variable capacitance elements, andsaid plural MOS variable capacitance elements have a common terminal to which a common control voltage is applied.
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Abstract
A voltage-controlled oscillator comprising a resonant circuit and MOS transistors which constitute a negative resistance circuit of a differential structure. The resonant circuit consists of an inductance element and a MOS variable capacitance element connected in parallel therewith. The MOS variable capacitance element is divided into plural pairs connected in parallel with each other. A voltage division circuit generates staircase different-step DC bias voltages to be applied respectively to the gates of the plural divided MOS transistors. The divided MOS variable capacitance elements have a common terminal to which a common control voltage is applied. The resonant circuit is capable of reducing a load on the control voltage generator and improving the characteristics of the voltage-controlled oscillator.
71 Citations
8 Claims
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1. A resonant circuit, comprising;
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an induction element; and a MOS variable capacitance element connected in parallel with said induction element, wherein said MOS variable capacitance element is divided into a plurality of elements which are connected in parallel with each other, and a plurality of bias terminals are provided for applying staircase different-step DC bias voltages respectively to gates of MOS transistors constituting the plural divided MOS variable capacitance elements, and said plural MOS variable capacitance elements have a common terminal to which a common control voltage is applied. - View Dependent Claims (2)
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3. A voltage-controlled oscillator,
a resonant circuit comprising an induction element and a MOS variable capacitance element connected in parallel with said induction element; - and
a negative resistance circuit of a differential structure connected to said resonant circuit, wherein said MOS variable capacitance element consists of a plurality of divided MOS variable capacitance elements connected in parallel with each other and having a common tennis to which a common control voltage is applied, said oscillator further having a means for generating staircase different-step DC bias voltages to be applied respectively to the gates of MOS transistors which constitute said plurality of divided MOS variable capacitance elements. - View Dependent Claims (4, 5, 6, 7, 8)
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Specification