Title:
三角波発振回路
Document Type and Number:
Japanese Patent JP4750582
Kind Code:
B2
Abstract:
In a triangular-wave generating apparatus including an output terminal adapted to output an output voltage, an incorporated capacitor connected to the output terminal, a first variable current source adapted to charge the incorporated capacitor and a second variable current source adapted to discharge the incorporated capacitor, a charging/discharging current setting circuit sets a charging current in the first variable current source and sets a discharging current in the second variable current source. A level determining circuit determines whether or not the output voltage reaches one of predetermined voltages, to generate timing signals. A reference clock signal generating circuit generates a reference clock signal for defining a frequency of the output voltage. A charging/discharging current adjusting circuit adjusts the charging current and the discharging current in accordance with the timing signals and the reference clock signal.
Inventors:
Motoaki Toshiaki
Application Number:
JP2006050500A
Publication Date:
August 17, 2011
Filing Date:
February 27, 2006
Export Citation:
Assignee:
Renesas Electronics Corporation
International Classes:
H03K3/0231; H03K4/06
Domestic Patent References:
| JP200520179A | ||||
| JP200472657A | ||||
| JP2002176340A | ||||
| JP685625A | ||||
| JP440112A |
Attorney, Agent or Firm:
Ken Ieiri