Title:
DIFFERENTIAL CURRENT OUTPUT UNIT
Document Type and Number:
Japanese Patent JP3761089
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To provide a differential current output unit in which a chip area is reduced by decreasing the number of capacitors in use, an output current is varied smoothly depending on a variation in differential input voltage, a variation in transistor characteristics, e.g. a current amplification factor, due to a temperature or the like, and which has substantially no effect on output current characteristics and in which stabilized operation is ensured.
SOLUTION: Output current characteristics are stabilized by constituting all circuits from the input to the output of a differential circuit and a current mirror circuit having a specified mirror ratio and a current flowing through upper and lower transistor circuits (i.e. a through current) is prevented by separating the upper and lower transistor circuits using a separation circuit.
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Inventors:
Kenji Otani
Fujii Norio
Fujii Norio
Application Number:
JP2003121152A
Publication Date:
March 29, 2006
Filing Date:
April 25, 2003
Export Citation:
Assignee:
ROHM Co., Ltd.
International Classes:
G05F1/12; H03F3/45; G05F1/10; G05F3/26; H02P1/16; H02P7/06; H03K3/00; (IPC1-7): H03F3/45; G05F1/12; G05F3/26
Domestic Patent References:
| JP2001112281A | ||||
| JP2002325479A |
Attorney, Agent or Firm:
Makoto Monda
Terumi Hemi
Terumi Hemi
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