Oscillation circuit and oscillator
First Claim
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1. An oscillation circuit comprising:
- a cross-coupled circuit having a first active element and a second active element that are differentially connected to each other,a capacitor connected between the drain terminal of the first active element and the drain terminal of the second active element,wherein the oscillation circuit oscillates in a resonance frequency of a resonator connected between the first active element and the second active element,a source terminal of the first active element is connected to GND through a first source load circuit,a source terminal of the second active element is connected to GND through a second source load circuit,a drain terminal of the first active element is connected to a voltage source through a first drain load circuit,a drain terminal of the second active element is connected to a voltage source through a second drain load circuit,a first source impedance includes an impedance of the first source load circuit and an impedance of the resonator,a first drain impedance includes an impedance of the first drain load circuit and an impedance of the capacitor,a second source impedance includes an impedance of the second source load circuit and the impedance of the resonator,a second drain impedance includes an impedance of the second drain load circuit and the impedance of the capacitor,the impedance of the capacitor is equal to a parallel capacitance of the resonator,the first source impedance is equal to or greater than the first drain impedance, andthe second source impedance is equal to or greater than the second drain impedance.
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Abstract
An oscillation circuit includes a cross-coupled circuit having a first active element and a second active element which are differentially connected to each other. The oscillation circuit oscillates in a resonance frequency of a resonator connected between the first active element and the second active element.
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Citations
6 Claims
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1. An oscillation circuit comprising:
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a cross-coupled circuit having a first active element and a second active element that are differentially connected to each other, a capacitor connected between the drain terminal of the first active element and the drain terminal of the second active element, wherein the oscillation circuit oscillates in a resonance frequency of a resonator connected between the first active element and the second active element, a source terminal of the first active element is connected to GND through a first source load circuit, a source terminal of the second active element is connected to GND through a second source load circuit, a drain terminal of the first active element is connected to a voltage source through a first drain load circuit, a drain terminal of the second active element is connected to a voltage source through a second drain load circuit, a first source impedance includes an impedance of the first source load circuit and an impedance of the resonator, a first drain impedance includes an impedance of the first drain load circuit and an impedance of the capacitor, a second source impedance includes an impedance of the second source load circuit and the impedance of the resonator, a second drain impedance includes an impedance of the second drain load circuit and the impedance of the capacitor, the impedance of the capacitor is equal to a parallel capacitance of the resonator, the first source impedance is equal to or greater than the first drain impedance, and the second source impedance is equal to or greater than the second drain impedance.
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2. The oscillation circuit according to claim 1, wherein each of the first source load circuit, the second source load circuit, the first drain load circuit, and the second drain load circuit includes a static current circuit.
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3. The oscillation circuit according to claim 1, wherein each of the first source load circuit and the second source load circuit includes a capacitor and an inductor connected in parallel to each other, and
wherein each of the first drain load circuit and the second drain load circuit includes a capacitor and an inductor connected in parallel to each other.
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4. The oscillation circuit according to claim 1, wherein each of the first source load circuit, the second source load circuit, the first drain load circuit, and the second drain load circuit includes a static current circuit, and
wherein an amplitude fixation circuit is disposed between the source terminal and the drain terminal of the first active element and between the source terminal and the drain terminal of the second active element.
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5. The oscillation circuit according to claim 4, wherein a capacitor is disposed between the gate terminal of the first active element and the drain terminal of the second active element and between the gate terminal of the second active element and the drain terminal of the first active element.
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6. The oscillation circuit according to claim 4 further comprising:
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a first amplifier disposed between the gate terminal and the drain terminal of the first active element; and a second amplifier disposed between the gate terminal and the drain terminal of the second active element.
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Specification
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Current AssigneeSeiko Epson Corporation (Seiko Group)
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Original AssigneeSeiko Epson Corporation (Seiko Group)
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InventorsYajima, Aritsugu, Adachi, Takehiko
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Primary Examiner(s)Kinkead; Arnold
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Assistant Examiner(s)Tan; Richard
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Application NumberUS12/037,562Publication NumberTime in Patent Office833 DaysField of Search331/108.R, 331/116.R, 331/116.FE, 331/117.FE, 331/154, 331/158, 331/162, 331/175, 331/185, 331/186, 331/107.AUS Class Current331/107.00ACPC Class CodesH03B 5/326 the resonator being an acou...
