Question

Draw the circuit diagram of voltage to current convertes and explain its working.

Answer 1

There are two types of voltage to current converter.

(a) Floating load

(b) Ground load

Here showing below floating load voltage to current converter. If the load of a circuit is not grounded, then it is called floating type load.

To explain this floating load type converter, we using a non- inverting amplifier where inverting terminal is connected with a feedback resistance with output of the circuit. A load voltage V is applied at the non-inverting terminal. At node B, the voltage will be same as that of A. (As per ideal Op-amp properties).

From The circuit, current I(B)⁻=0

Therefore, load current  I(L) is due to load resistance. Load current is directly proportional to the input voltage Vin. This amplifier converter is also known as trans-conductance amplifier