TEMPERATURE COMPENSATION OSCILLATOR

Title:

TEMPERATURE COMPENSATION OSCILLATOR

Document Type and Number:

WIPO Patent Application WO/2002/019514

Kind Code:

A1

Abstract:

A temperature sensing circuit (13) measures the temperature of an oscillation circuit (47). A tertiary term voltage generating circuit of a control voltage generating circuit (23) generates a tertiary term voltage used as a control voltage according to the output voltage of the temperature sensing circuit (13). A frequency adjusting circuit (45) varies the oscillation frequency of the oscillation circuit (47) according to the control voltage. The tertiary term voltage generating circuit has a first MOS transistor (37) the source of which is connected to a first power supply line (25), a second MOS transistor (35) the source of which is connected to a second power supply line (26), and digital control voltage dividing circuits (31, 33) for generating first and second gate voltages according to the output voltage of the temperature sensing circuit (13). The first and second gate voltages are applied to the gates of the first and second MOS transistors (37, 35), respectively. The connection node (44) to which the drains are commonly connected are made the output end of the control voltage.

More Like This:

WO/1999/023753	CRYSTAL OSCILLATOR WITH AGC AND ON-CHIP TUNING
JP2006005558	HIGH-FREQUENCY OSCILLATOR
WO/2000/007290	MULTIPLE-PHASE-INTERPOLATION LC VOLTAGE-CONTROLLED OSCILLATOR

Inventors:

FUKAYAMA HIROYUKI (JP)
SAKURAI YASUHIRO (JP)

Application Number:

PCT/JP2001/007372

Publication Date:

March 07, 2002

Filing Date:

August 28, 2001

Export Citation:

Click for automatic bibliography generation Help

Assignee:

CITIZEN WATCH CO LTD (JP)
FUKAYAMA HIROYUKI (JP)
SAKURAI YASUHIRO (JP)

International Classes:

H03B5/04; H03B5/32; H03B5/36; (IPC1-7): H03B5/32

Foreign References:

JPH08116214A	1996-05-07
JPH114119A	1999-01-06
JP2000188514A	2000-07-04
JP2001068933A	2001-03-16
JP2001127549A	2001-05-11

Other References: