TRIANGULAR WAVEFORM GENERATING CIRCUIT, GENERATING METHOD, INVERTER USING THEM, LIGHT EMITTING DEVICE AND LIQUID CRYSTAL TELEVISION

WIPO Patent Application WO/2008/029509

A1

A charging/discharging circuit (32) charges or discharges a capacitor (C2) having an end the potential at which is fixed. A first comparator (COMP1) compares an output voltage (Vout) of the capacitor (C2) with a first threshold voltage (Vmin) to output a first comparison signal (S1) in accordance with a comparison result. An edge detecting circuit (34) detects the edges of an externally applied synchronization signal (SYNC_IN), the frequency of which is equal to approximately a half of a triangular waveform signal generated by the triangular waveform generating circuit (30), and outputs an edge detection signal (S4) that exhibits a predetermined level for each of the detected edges. A charging/discharging control part (40) refers to both the first comparison signal (S1) outputted by the first comparator (COMP1) and the edge detection signal (S4) outputted by the edge detecting circuit (34) to switch, in accordance with the level transitions of these signals, the charging/discharging states of the charging/discharging circuit (32). The voltage of the capacitor (C2) is outputted as a triangular waveform signal (Vosc).

JP3062161	TEST WAVEFORM GENERATING DEVICE
JP2944479	WAVEFORM PROCESSING DEVICE

HAGINO JUNICHI (JP)
FUKUMOTO KENICHI (JP)

PCT/JP2007/000949

March 13, 2008

September 03, 2007

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ROHM CO LTD (JP)
HAGINO JUNICHI (JP)
FUKUMOTO KENICHI (JP)

H03K4/06; H02M7/00

JP2002199242A	2002-07-12
JPS62169514A	1987-07-25
JP2003274668A	2003-09-26
JPH06230267A	1994-08-19
JP2004072657A	2004-03-04
JP2001345682A	2001-12-14
JP2004242403A	2004-08-26

MORISHITA, Sakaki (Ebisu-Nishi Shibuya-k, Tokyo 21, JP)

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