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Patent Searching and Data


Title:
CURRENT SUPPLY CIRCUIT
Document Type and Number:
Japanese Patent JP2009157590
Kind Code:
A
Abstract:

To provide a current supply circuit excellent in current precision and start-up performance.

This current supply circuit is provided with an enablement detecting circuit 1, the first cascode circuit 2 for outputting a prescribed current in an enabling state, the second cascode circuit 3 for outputting a current in response to the output current of the first cascode circuit 2, the first potential generating circuit 4 for generating a potential of the second node Vb in the first cascode circuit 2, based on a potential of the first node Va in the first cascode circuit 2, the second potential generating circuit 5 for generating a potential of the fourth node Vd in the second cascode circuit 3, based on a potential of the third node Vc in the second cascode circuit 3, and a start-up circuit 6 for setting the potential of the third node Vc, irrespective of operations of the first cascode circuit 2 and the first potential generating circuit 4, just after getting to the enabling state. The output current of the second cascode circuit 3 is stabilized in a short time by the start-up circuit 6.


Inventors:
ISHIKAWA MIYUKI
Application Number:
JP2007334337A
Publication Date:
July 16, 2009
Filing Date:
December 26, 2007
Export Citation:
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Assignee:
TOSHIBA CORP
International Classes:
G05F3/26; H03F3/34
Attorney, Agent or Firm:
Kenji Yoshitake
Yasukazu Sato
Hiroshi Yoshimoto
Yasushi Kawasaki