Current mirror circuit and semiconductor integrated circuit havi

Details Current mirror circuit and semiconductor integrated circuit havi Current mirror circuit and semiconductor integrated circuit havi

1998-06-30

1999-09-14

Pascal, Robert

Amplifiers

With semiconductor amplifying device

Including current mirror amplifier

323315, H03F 304

Patent

active

059528842

ABSTRACT:
A current mirror circuit has a reference current source for supplying a reference current, and a plurality of field effect transistors including an input circuit connected to the reference current source and supplied with the reference current and at least an output circuit connected to the input circuit in a current mirror fashion. The input circuit has first and second input transistors connected in series with each other. The gates of the first and second input transistors are connected both to the drain of the second input transistor. The drain of the second input transistor is connected to the reference current source. The output circuit has first and second output transistors connected in series with each other. The source of the first output transistor is connected to the source of the first input transistor. The gates of the first and second output transistors are connected to the gates of the first and second input transistors, respectively. Further, an output current is produced from the drain of the second output transistor. The second input transistor is operated with a voltage not higher than the threshold voltage of the first input transistor. As a result, the output impedance can be increased even with a low source voltage, and the mirror ratio can be set with a high accuracy.

REFERENCES:
patent: 4284959 (1981-08-01), Heagerty et al.
patent: 4477782 (1984-10-01), Swanson
patent: 5444363 (1995-08-01), Cabler
patent: 5568082 (1996-10-01), Hedberg
patent: 5835994 (1998-11-01), Adams
patent: 5892402 (1999-04-01), Tsubaki et al.

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