Title:
チャージポンプ回路
Document Type and Number:
Japanese Patent JP5011182
Kind Code:
B2
Abstract:
There is provided a charge pump circuit which can prevent EMI noise of a frequency component independent of an operation clock frequency from occurring at the time of a change from a disable state to an enable state. The charge pump circuit includes a detection signal synchronization circuit which outputs a synchronization detection signal generated by synchronizing a detection signal outputted from a level detection circuit to a clock signal outputted from an oscillator circuit. The synchronization detection signal is used as a pump enable signal, and a first pump capacitance and a second pump capacitance in a pump circuit body are charged and discharged in response to the synchronization detection signal and the clock signal outputted from the oscillator circuit.
Inventors:
Takanobu Suzuki
Yata Susumu
Yata Susumu
Application Number:
JP2008075148A
Publication Date:
August 29, 2012
Filing Date:
March 24, 2008
Export Citation:
Assignee:
Renesas Electronics Corporation
International Classes:
H02M3/07; H02M3/00
Domestic Patent References:
| JP200520971A | ||||
| JP2156499A | ||||
| JP200232987A | ||||
| JP2001338493A | ||||
| JP2007312492A | ||||
| JP7154962A | ||||
| JP11317089A | ||||
| JP2000270541A | ||||
| JP2001238435A |
Foreign References:
| US6232830 | ||||
| US20020130701 | ||||
| US20070120591 |
Attorney, Agent or Firm:
Yoshitake Hidetoshi
Takahiro Arita
Takahiro Arita