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Shown in the drawing is a device for converting a positive or negative input voltage into a current on terminal output OUT.
English (United States)
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Voltage to Current Converter
Shown in the drawing is a device for converting a positive or negative input
voltage into a current on terminal output OUT.
The complete converter comprises two symmetrical circuits 1 and
2, one for converting the positive input voltages and the other for
converting the negative input voltages, respectively. Both circuits
operate in the same way and consequently only circuit 1 is described.
Components in circuit 2 have the same numbers, though with prime
signs, as in circuit 1.
The arrangement of transistors T1 to T6 provide for a voltage on node A
equal to zero. Transistors T5 and T6 connected to resistors R5 and R6
comprise a current mirror, which makes equal the currents in the branches
comprising transistors T1+ T4 and transistors T2+ T3. Consequently, the base-
to-emitter voltages of transistors T1+ T4 and T2 + T3 are equal, and the voltage
on node A is equal to zero. Thus a current IE = V(IN)/ RE flows in resistor RE.
This current is split in the two branches connected between nodes A and B so
that the collector current of transistor T8 is equal to IE plus the base current of
To eliminate this base current in the output current, transistors T7 and T9 are
provided. A resistor R9 is connected to the emitter of transistor T9, the value of
which is twice the value of resistor R8 connected to the emitter of transistor T3.
Consequently, the same current flows in the collector-to-emitter paths of
transistors T1 and T7, a...