OSCILLATED FREQUENCY CONTROL METHOD, VOLTAGE CONTROLLED PIEZOELECTRIC OSCILLATOR, VOLTAGE CONTROLLED PIEZOELECTRIC OSCILLATOR ADJUSTMENT SYSTEM AND METHOD FOR ADJUSTING VOLTAGE CONTROLLED PIEZOELECTRIC OSCILLATOR

Title:

Document Type and Number:

Japanese Patent JP2000031741

Kind Code:

A

Abstract:

To provide a voltage controlled piezoelectric oscillator circuit that does not employ a variable capacitor and a trimmer.

A variable voltage generating circuit 10 applies a power supply voltage VDD that is adjusted in response to a control voltage Vc to an oscillation circuit 20. A frequency adjustment circuit 30 adjusts a center of oscillated frequencies of the oscillation circuit 20. Furthermore, a memory 60 stores frequency setting data and voltage gradient data and the data are fed to a variable voltage generating circuit 10 and the frequency adjustment circuit 30 via a control circuit 50. When the power supply voltage VDD of the oscillation circuit 20 is fluctuated, since a parasitic capacitance depending on the voltage changes, the oscillated frequency of an oscillated signal SOSC is varied.

Inventors:

OKA MANABU
TAKADA YUTAKA
IMAI NOBUYUKI

Application Number:

JP8725699A

Publication Date:

January 28, 2000

Filing Date:

March 29, 1999

Export Citation:

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Assignee:

SEIKO EPSON CORP

International Classes:

H03B5/32; H03B5/12; (IPC1-7): H03B5/32; H03B5/12

Attorney, Agent or Firm:

Kawasakizaki Kenji (1 person outside)

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