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This circuit serves to supply a low-ohmic output with an output voltage which is of the same magnitude as an voltage applied, irrespective of current, voltage and resistance tolerances.
English (United States)
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Impedance Converting Circuit
This circuit serves to supply a low-ohmic output with an output voltage which
is of the same magnitude as an voltage applied, irrespective of current, voltage
and resistance tolerances.
The principal part of the circuit is a current switch, the two branches of which
are formed by two NPN transistors TA and TB. Input voltage V REF is applied to
the base of TA, while output voltage V OUT is generated at the base of TB.
Output current I OUT is drawn from an NPN feedback transistor TR, whose
emitter is connected to node V OUT. The base of transistor TR is dotted with the
collector of transistors TB and T6. TR ensures that the level of V OUT is
practically independent of the magnitude of output current I OUT, so that the
output is low-ohmic.
A first current mirror consisting of NPN transistors T1, T2 and T3 serves as a
source for the common emitter current IEE of the current switch. Reference
current IP for this first current mirror is supplied by a second current mirror
consisting of PNP transistors T4, T5, T6, and T7 in connection with a current
source consisting of transistor T8 and its appertaining resistor and outer control
All three transistors T1, T2, T3 of the first current mirror have identical sizes
and characteristics, so that emitter current IEEE is always twice as high as
reference current IP applied to T1. Current IP is generated in T5 of the second
current mirror, the other output of which - the collector of T6 -...