(57) A current mirror circuit serves to produce an output current flowing in an output
branch corresponding to a reference current flowing in an input branch located between
a supply voltage terminal and ground. Located in the input branch is a first bipolar
transistor (10) through the collector/emitter circuit of which the reference current
furnished by a current source (14) connected to the collector flows. Through the collector/emitter
circuit of a second bipolar transistor (12) located in the output branch the output
current flows. The bases of the two transistors (10, 12) are connected to each other.
A further current mirror circuit (16, 18, 20) is provided having an input branch located
between the supply voltage terminal and ground and an output branch located between
the supply voltage terminal and the connected bases of the two bipolar transistors
(10, 12) for generating a base current (Ib) for these transistors. A current source (20) controlled by the collector voltage
of the first bipolar transistor (10) is located in the input branch of this further
current mirror circuit (16, 18, 20), the output current (2Ib) of said current source (20) being mirrored in the output branch of said further
current mirror circuit (16, 18, 20).
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