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Simplified schematic diagram of the module output stage.

Simplified schematic diagram of the module output stage.

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Fig. 1. Block diagram of the 24 A transconductance amplifier using a...
Fig. 2. The transconductance amplifier constructed at Inmetro.
Fig. 3. The 4 A module (left) with the shunt resistor soldered at its...
Fig. 4. Simplified schematic diagram of the module input stage.
+4 Fig. 5. Simplified schematic diagram of the module output stage.
A 24 A, 100 kHz transconductance amplifier with stable current output constructed at Inmetro
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  • Sep 2021
A 24 A, 100 kHz transconductance amplifier was constructed at Inmetro as part of a trilateral South American project to develop a reference system for measuring electric power. It is based on a design conceived by NIST in the 1990s where a number of precision bipolar voltage-to-current converters are paralleled. The present design version includes...
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Context 1
... schematic diagrams of the module input and output stages are shown in Figs. 4 and 5, respectively. A voltage V in applied to the input terminal (Fig. 4) causes an output current flow in the shunt resistor R s (Fig. 5). The voltage drop in the shunt resistor is amplified by the differential unit gain amplifier U4, and its output is fed back through R 2 where it is compared with the input voltage at the inverting input of the operational amplifier ...
Context 2
... the module output stage in Fig. 5, as Q1 and Q2 baseemitter voltages cancel out, the voltage drop in R 3 is equal to the voltage drop in R 4 . Therefore, the collector current (and emitter current) of Q3 is approximately given by the current through R 3 multiplied by R 3 /R 4 . Transistors Q2 and Q3 form a Sziklai pair. The power transistors figure) to provide ...