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US 8,076,982 B2Granted
Voltage-controlled variable frequency oscillation circuit and signal processing circuit
AssigneeSony Corporation
InventorNorihito Suzuki
Life of this patent
Estimating the term…
Abstract
A voltage-controlled variable frequency oscillation circuit, includes: an oscillation circuit section including a resonance circuit which includes a coil and a variable capacitance element, and a negative resistance circuit; and a first resistor connected between the oscillation circuit section and a first one of a pair of terminals of a power supply.
Claims16
A voltage-controlled variable frequency oscillation circuit, comprising:
- an oscillation circuit section including a resonance circuit which includes a coil and a variable capacitance element, and a negative resistance circuit;
- and
- a first resistor connected between the resonance circuit of said oscillation circuit section and a first one of a pair of terminals of a power supply, wherein said first resistor includes a plurality of resistance elements and a plurality of switch circuits, said switch circuits being individually controlled with a controlling signal between on and off to variably control the resistance value of said first resistor ;
- a second resistor connected between the negative resistance circuit of said oscillation circuit section and a second one of the terminals of the power supply,
- wherein both of said first resistor and said second resistor have a variably controllable resistance value, and
- wherein both of said first resistor and said second resistor are formed from a plurality of resistance elements and a plurality of switch circuits, and said switch circuits are individually controlled between on and off to variably control the resistance value of said first and second resistors.
3 more elements
A voltage-controlled variable frequency oscillation circuit, comprising:
- an oscillation circuit section including a resonance circuit which includes a coil and a variable capacitance element, and a negative resistance circuit,
- a first resistor connected between the resonance circuit of said oscillation circuit section and a first one of a pair of terminals of a power supply, wherein said first resistor includes a plurality of resistance elements and a plurality of switch circuits, said switch circuits being individually controlled with a controlling signal between on and off to variably control the resistance value of said first resistor,
- a second resistor connected between the negative resistance circuit of said oscillation circuit section and a second one of the terminals of the power supply,
- wherein both of said first resistor and said second resistor have a variably controllable resistance value,
- wherein said resonance circuit includes a variable capacitance circuit whose capacitance is variably controlled in accordance with an oscillation frequency, and
- the resistance value of both of said first and second resistors is varied in response to variation control of the capacitance in accordance with the oscillation frequency.
3 more elements
A voltage-controlled variable frequency oscillation circuit, comprising:
- an oscillation circuit section including a resonance circuit which includes a coil and a variable capacitance element, and a negative resistance circuit,
- a first resistor connected between the resonance circuit of said oscillation circuit section and a first one of a pair of terminals of a power supply, wherein said first resistor includes a plurality of resistance elements and a plurality of switch circuits, said switch circuits being individually controlled with a controlling signal between on and off to variably control the resistance value of said first resistor,
- a second resistor connected between the negative resistance circuit of said oscillation circuit section and a second one of the terminals of the power supply,
- wherein both of said first resistor and said second resistor have a variably controllable resistance value;
- and
- a detection circuit for detecting the amplitude of an oscillation output signal of said oscillation circuit section and variably controlling the resistance value of both of said first and second resistors.
3 more elements
A signal processing circuit, comprising:
- a voltage-controlled variable frequency oscillation circuit including:
- an oscillation circuit section including a resonance circuit which includes a coil and a variable capacitance element and a negative resistance circuit,
- (ii) a first resistor connected between said oscillation circuit section and a first one of a pair of terminals of a power supply,
- (iii) a second resistor connected between said oscillation circuit section and a second one of the terminals of the power supply;
- and
- a processing circuit configured to carry out a predetermined signal process using an oscillation frequency signal from said voltage-controlled variable frequency oscillation circuit,
- wherein both of said first and second resistors have a resistance value which is variably controlled with adjustment data,
- wherein both of said first resistor and said second resistor are formed from a plurality of resistance elements and a plurality of switch circuits, and said switch circuits are individually controlled between on and off to variably control the resistance value of said first and second resistors.
5 more elements
A signal processing circuit, comprising:
- a voltage-controlled variable frequency oscillation circuit including:
- an oscillation circuit section including a resonance circuit which includes a coil and a variable capacitance element and a negative resistance circuit;
- (ii) a first resistor connected between said oscillation circuit section and a first one of a pair of terminals of a power supply, wherein said first resistor includes a plurality of resistance elements and a plurality of switch circuits, said switch circuits being individually controlled with a controlling signal between on and off to variably control the resistance value of said first resistor;
- (iii) a second resistor connected between said oscillation circuit section and a second one of the terminals of the power supply;
- and
- a processing circuit configured to carry out a predetermined signal process using an oscillation frequency signal fom said voltage-controlled variable frequency oscillation circuit,
- wherein both of said first and second resistors have a resistance value which is variably controlled with adjustment data,
- wherein said resonance circuit includes a variable capacitance circuit whose capacitance is variably controlled in accordance with an oscillation frequency, and
- wherein the resistance value of both of said first and second resistors is varied in response to variation control of the capacitance in accordance with the oscillation frequency.
6 more elements
A signal processing circuit, comprising:
- a voltage-controlled variable frequency oscillation circuit including:
- an oscillation circuit section including a resonance circuit which includes a coil and a variable capacitance element and a negative resistance circuit;
- (ii) a first resistor connected between said oscillation circuit section and a first one of a pair of terminals of a power supply, wherein said first resistor includes a plurality of resistance elements and a plurality of switch circuits, said switch circuits being individually controlled with a controlling signal between on and off to variably control the resistance value of said first resistor;
- (iii) a second resistor connected between said oscillation circuit section and a second one of the terminals of the power supply;
- and
- a processing circuit configured to carry out a predetermined signal process using an oscillation frequency signal from said voltage-controlled variable frequency oscillation circuit,
- wherein both of said first and second resistors have a resistance value which is variably controlled with adjustment data;
- and
- a detection circuit for detecting the amplitude of an oscillation output signal of said oscillation circuit section and variably controlling the resistance value of both of said first and second resistors.
6 more elements
Dependencies are inferred from the claim text.