Oscillator circuit, oscillator, electronic apparatus, and activation method of oscillator circuit
AssigneeSeiko Epson Corporation
InventorMasataka NOMURA
Life of this patent
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Abstract
An oscillator circuit includes a resonator (SAW resonator), an amplifier circuit, and a switching element (NMOS switch). The amplifier circuit has a feedback path from one end to the other end of the resonator, a first inductance element (elongated coil) provided in the feedback path, and a variable capacitance element (variable capacitance diode) provided in the feedback path in series with the first inductance element. The switching element is provided in parallel to a circuit part including the first inductance element and the variable capacitance element.
Claims20
An oscillator circuit comprising:
- a resonator;
- an amplifier circuit having a feedback path from one end to the other end of the resonator, a first inductance element provided in the feedback path, and a variable capacitance element provided in the feedback path in series with the first inductance element;
- and
- a switching element provided in parallel to a circuit part including the first inductance element and the variable capacitance element.
An activation method of an oscillator circuit including a resonator, and an amplifier circuit having a feedback path from one end to the other end of the resonator and provided with an inductance element and a variable capacitance element in series in the feedback path, the method comprising;
- short-circuiting both ends of a circuit part including the inductance element and the variable capacitance element in a predetermined period after a power supply is turned on;
- and
- terminating the short-circuiting of the circuit part after the predetermined period has elapsed.
Dependencies are inferred from the claim text.