VOLTAGE CONTROL OSCILLATION CIRCUIT - NIIGATA SEIMITSU CO LTD

Title:

VOLTAGE CONTROL OSCILLATION CIRCUIT

Document Type and Number:

WIPO Patent Application WO/2008/047692

Kind Code:

A1

Abstract:

A voltage control oscillation circuit includes: resistors (R1, R2); a positive feedback circuit of oscillation pair of transistors (M1, M2); variable-capacity diodes (D1, D2); and bias circuits (M4, M5) giving a fixed bias voltage to the variable-capacity diodes (D1, D2). By changing the capacity value of the variable-capacity diodes (D1, D2) by a synchronous voltage VT so as to control the oscillation frequency, it is possible to configure a voltage control oscillator without using an inductor not appropriate for an IC or constant current source which tends to cause a large current noise.

Inventors:

IKEDA TAKESHI (JP)
MIYAGI HIROSHI (JP)

Application Number:

PCT/JP2007/069895

Publication Date:

April 24, 2008

Filing Date:

October 04, 2007

Export Citation:

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Assignee:

NIIGATA SEIMITSU CO LTD (JP)
RICOH KK (JP)
IKEDA TAKESHI (JP)
MIYAGI HIROSHI (JP)

International Classes:

H03B5/20; H03K3/282

Foreign References:

JPS61253919A	1986-11-11
JPH06196974A	1994-07-15
JP2006012199A	2006-01-12
JPS60148203A	1985-08-05
JPH07288468A	1995-10-31
JPH0656743U	1994-08-05