Title:
電圧制御発振器及び周波数-電圧変換器
Document Type and Number:
Japanese Patent JP3567747
Kind Code:
B2
Abstract:
Disclosed are an integration circuit capable of substantially raising the ratio of a current to a capacitance, I/C, and voltage-controlled oscillator and frequency-voltage converter which employ the integration circuit. The integration circuit comprises an integrating capacitor, a current source, a switch, a detection circuit, and a control circuit. The current source supplies a current to the integrating capacitor. The switch is installed on a path along which a current is supplied from the current source to the integrating capacitor. The detection circuit detects a voltage developed at the integrating capacitor. The control circuit controls the switch so that a current will be supplied from the current source to the integrating capacitor during an integration period. The integration period falls into a current supply period and a stop period. The control circuit controls the switch so that a current will be supplied from the current source to the integrating capacitor during the current supply period and no current will be supplied from the current source to the integrating capacitor during the stop period.
Inventors:
Yuji Segawa
Kunihiko Goto
Kunihiko Goto
Application Number:
JP21659298A
Publication Date:
September 22, 2004
Filing Date:
July 31, 1998
Export Citation:
Assignee:
富士通株式会社
International Classes:
G06G7/184; H03K7/06; H03K9/06; (IPC1-7): G06G7/184
Domestic Patent References:
| JP54026642A | ||||
| JP50017259A |
Attorney, Agent or Firm:
Tetsuo Hirado