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Title:
OSCILLATION CIRCUIT
Document Type and Number:
Japanese Patent JP2004349831
Kind Code:
A
Abstract:

To provide an oscillation circuit with a simple configuration and low power consumption wherein a consumed current is small.

The oscillation circuit is provided with: a capacitor Co for charging / discharging a current; a charge / discharge circuit 1 for controlling the current; a first comparator (COMP1) 2 for detecting a charging voltage across the capacitor Co with a first reference voltage Vref1; a second comparator (COMP2) 3 for detecting a charging voltage across the capacitor Co with a second reference voltage Vref2; and a bias current control circuit 4 for respectively receiving an output of the first comparator 2 and an output of the second comparator 3. The bias current control circuit 4 cuts off bias currents of the first and second comparators 2, 3 and alternately invalidates the comparators to control a charging / discharging period of the capacitor Co.


Inventors:
MIZOE KIMIYOSHI
Application Number:
JP2003142166A
Publication Date:
December 09, 2004
Filing Date:
May 20, 2003
Export Citation:
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Assignee:
FUJI ELEC DEVICE TECH CO LTD
International Classes:
H03K3/354; H03K3/0231; H03K4/06; (IPC1-7): H03K3/0231; H03K3/354; H03K4/06
Attorney, Agent or Firm:
Takeshi Hattori