Current mirror with low copying error

Details Current mirror with low copying error Current mirror with low copying error

1992-11-12

1994-04-26

Mottola, Steven

Amplifiers

With semiconductor amplifying device

Including current mirror amplifier

330288, H03F 304

Patent

active

053070275

ABSTRACT:
The disclosure relates to current mirrors in which a high level of copying error may arise out of the collapse of the gain of the transistors. The mirror includes, in its output arm, a "Darlington" type amplifier subjected to feedback by a buffered mirror. The error gets cancelled for a gain .beta.=1. A second Darlington amplifier mounted symmetrically with the first Darlington enables the V.sub.CE values of the transistors to be balanced. The disclosed device can be applied to current mirrors when the transistors are low-gain transistors (.perspectiveto.1).

REFERENCES:
patent: 3843933 (1974-10-01), Ahmed
patent: 4237414 (1980-12-01), Stein
RCA Technical Notes, No. 949, Dec. 31, 1973, 7 pages, Jonathan S. Radovsky, "Current-Mirror Amplifiers Having Current Gains Less Influenced by the Base Currents of Component Transistors".

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