Voltage Controlled Current Source (VCCS) Circuit:

An ideal form of a current source, whose output current I_out is controlled by an input voltage is shown in Fig. 36.35. Here, the output current I_out is dependent on input voltage V_in.

A practical circuit can be built, as shown in Fig. 36.36, with the output or load current through load resistor R_L controlled by the input voltage V_in. The current through load resistor R_L can be seen to be I_out = V_in/R₁ = KV_in.

Since, the output resistance is (ideally) zero, there is no voltage division at the output and the output voltage is independent of load.