Title:
A SAWTOOTH WAVE GENERATING APPARATUS, A METHOD OF GENERATING SAWTOOTH WAVE, A CONSTANT CURRENT CIRCUIT, AND A METHOD OF ADJUSTING AMOUNT OF CURRENT FROM THE SAME
Document Type and Number:
WIPO Patent Application WO2004062104
Kind Code:
B1
Abstract:
A sawtooth wave generating apparatus 1 includes a base frequency generating section 10 and a frequency generating section 20 for generating the frequency of a reference signal, a sawtooth wave forming section 30 which forms a sawtooth wave based on the reference signal, a voltage comparator 60 which compares the voltage value of the sawtooth wave formed by the sawtooth wave forming section 30 with a predetermined voltage value, a phase comparator 70 which compares the phase of the output signal from the voltage comparator 60 with the phase of the reference signal, and a low-pass filter (LPF) 80 which cuts out a high frequency component of the output signal from the phase comparator 70, and feeds back the resulting output signal to the sawtooth wave forming section 30.
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Inventors:
TAKEUCHI KESATOSHI (JP)
Application Number:
PCT/JP2003/016823
Publication Date:
January 06, 2005
Filing Date:
December 25, 2003
Export Citation:
Assignee:
SEIKO EPSON CORP (JP)
TAKEUCHI KESATOSHI (JP)
TAKEUCHI KESATOSHI (JP)
International Classes:
H03K4/50; H03K4/501; H03K4/502; H03L7/099; H03K3/0231; (IPC1-7): H03K4/00
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