Patent ID: 8773170

Claim:
A voltage-to-current converter circuit configured to accept a reference voltage (Vref) and produce a precision reference current (Idc) for a load (Z_Load), the voltage-to-current circuit comprising: an amplifier (AMP) including a non-inverting (+) input, an inverting (−) input and an output; a transistor (M 1 ) including a control terminal (gate or base), a first current path terminal (source or emitter) and a second current path terminal (drain or collector), with a current path between the first and second current path terminals, wherein the control terminal (gate or base) of the transistor (M 1 ) is driven by the output of the amplifier (AMP); a first capacitor (C 1 ) connected between the inverting (−) input of the amplifier and the first current path terminal (source or emitter) of the transistor (M 1 ); a first resistor (R 1 ) including a first terminal and a second terminal, wherein the first terminal of the first resistor (R 1 ) is connected to the inverting (−) input of the amplifier (AMP); and a second resistor (R 2 ) including a first terminal and a second terminal, wherein the first terminal of the second resistor (R 2 ) is connected to the first current path terminal (source or emitter) of the transistor (M 1 ), and the second terminal of the second resistor (R 2 ) is connected to the second terminal of the first resistor (R 1 ); wherein the precision reference current (Idc) is produced at the second current path terminal (drain or collector) of the transistor (M 1 ).