Title:
オシレータ回路及び半導体記憶装置
Document Type and Number:
Japanese Patent JP4817960
Kind Code:
B2
Abstract:
An oscillator circuit (30) includes a capacitor (35), a first constant current source (33) electrically couplable to an end of the capacitor, a second constant current source (34) electrically ccuplable to the end of the capacitor (35), a control circuit (31, 32, 42) coupled to the end of the capacitor (35), a first reference potential (vrefh), and a second reference potential (vrefl) to switch, in response to a comparison of a potential at the end of the capacitor (35) with the first and second reference potentials (vrefh, vrefl), between a first operation to charge the capacitor (35) by electrically coupling the first constant current source (33) to the end of the capacitor (35) and a second operation to discharge the capacitor (35) by electrically coupling the second constant current source (34) to the end of the capacitor (35), and a circuit configured to have an output signal thereof exhibiting a signal transition in response to timing at which the switching occurs between the first operation and the second operation.
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Inventors:
Atsushi Takeuchi
Application Number:
JP2006138007A
Publication Date:
November 16, 2011
Filing Date:
May 17, 2006
Export Citation:
Assignee:
Fujitsu Semiconductor Limited
International Classes:
H03K4/06; G11C11/4076; H03K3/0231
Domestic Patent References:
| JP964699A |
Attorney, Agent or Firm:
Tadahiko Ito