Title:
V/F CONVERSION CIRCUIT
Document Type and Number:
Japanese Patent JP3697678
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To provide a V/F conversion circuit where a control range of an input voltage is traced with the input voltage up to a higher frequency.
SOLUTION: An I/F conversion circuit is made up of a charging circuit that charges a capacitor with a current depending on the capacitance and an output current, a discharging circuit that discharges the capacitor with a current depending on the output current, and a triangle wave generating circuit that has a feedback circuit for oscillation. Then a resistor is placed between the output of the triangle wave generating circuit and the capacitor and the feedback circuit receives an output voltage of the triangle wave generating circuit to select charging/discharging by the charging circuit and the discharge circuit.
Inventors:
Hiroyuki Ishikawa
Eiji Nakagawa
Eiji Nakagawa
Application Number:
JP13607797A
Publication Date:
September 21, 2005
Filing Date:
May 09, 1997
Export Citation:
Assignee:
ROHM Co., Ltd.
International Classes:
H03K4/50; H03K7/06; (IPC1-7): H03K4/50; H03K7/06
Domestic Patent References:
| JP4215317A | ||||
| JP6350446A | ||||
| JP5338257A |
Attorney, Agent or Firm:
Kajiyama Hiroshi
Fujio Yamamoto
Fujio Yamamoto