Title:
CURRENT SOURCE/SINK WITH HIGH OUTPUT IMPEDANCE USING BIPOLAR TRANSISTOR
Document Type and Number:
Japanese Patent JP2004357299
Kind Code:
A
Abstract:
To provide a circuit and method with which a cascode current source/sink with high output impedance can be realized.
The dependency on the external load is reduced by directing a compensation current corresponding to change in base current of the cascode (Q1) in an approach such that the compensation current cancels out the error of the cascode (Q1). A biasing circuit (200) is included and arranged such that change in base current of the cascode (Q1) is detected and a corresponding current is summed at the emitter of the cascode (Q1) such that the collector current of the cascode (Q1) remains unchanged.
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Inventors:
MARCO KOOSHI
BRIGHT WILLIAM J
KINYUA MARTIN KITHINJI
BRIGHT WILLIAM J
KINYUA MARTIN KITHINJI
Application Number:
JP2004157618A
Publication Date:
December 16, 2004
Filing Date:
May 27, 2004
Export Citation:
Assignee:
TEXAS INSTRUMENTS INC
International Classes:
H03F1/22; G05F3/26; (IPC1-7): H03F1/22
Attorney, Agent or Firm:
Sadao Kumakura
Fumiaki Otsuka
Toshio Imajo
Takaki Nishijima
Fumiaki Otsuka
Toshio Imajo
Takaki Nishijima