Electronic switching circuit uses an auxiliary circuit arrangement to ensure that the output current is linearly related to voltage

摘要

The circuit has an input applied via a resistor (R1) that connects with a current mirror circuit consisting of two transistors (T1, T2). This connects with an auxiliary circuit having a differencing amplifier (OP1), an NPN transistor (T3) and a resistor (R3). The output current is linearly proportional to voltage. A number of variations are possible.