Title:
SAW-TOOTH WAVE GENERATOR CIRCUIT
Document Type and Number:
Japanese Patent JP3870916
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To quickly generate a saw-tooth wave voltage having a stabilized amplitude.
SOLUTION: The saw-tooth generation circuit is provided with voltage sources 1, 8 for determining the reference voltage, a comparison circuit 2 for comparing the reference voltage VH of the voltage source 1 with the output voltage VOUT of a saw-tooth wave, two capacitors C1, C2 for alternately repeating charging/discharging in accordance with the compared result of the comparison circuit 2, a constant current circuit 7 for charging the capacitors C1, C2 with a current of a size for determining the oscillation frequency of the saw-tooth wave, switch circuits 3, 6 for forming respective discharge circuits of the capacitors C1, C2, and switch circuits 4, 5 for respectively connecting the capacitors C1, C2 to the constant current circuit 7 so as to alternately charge the capacitors C1, C2. Thus saw-tooth wave having a prescribed amplitude corresponding to the reference voltage VH and VL can be generated from an output terminal 9.
Inventors:
Satoshi Sugawara
Application Number:
JP2003070198A
Publication Date:
January 24, 2007
Filing Date:
March 14, 2003
Export Citation:
Assignee:
Fuji Electric Holdings Co., Ltd.
International Classes:
H02M3/00; H03K4/08; H03K4/06; (IPC1-7): H03K4/08; H03K4/06; //H02M3/00
Domestic Patent References:
| JP60235520A |
Foreign References:
| WO1999053609A1 |
Other References:
Flynn, M.P. Lidholm, S.U. , A 1.2- mu m CMOS current-controlled oscillator ,Solid-State Circuits, IEEE Journal of,1992年 7月,Volume: 27, Issue: 7,982- 987
Attorney, Agent or Firm:
Takeshi Hattori