A system, comprising: a front end circuit configured to receive an input voltage and to provide a regulated front end direct current voltage; a multichannel source circuit coupled to the front-end circuit, the multichannel source circuit comprising a controller, a reference voltage circuit, and a plurality of source circuits (206A, 206B, 206C,... 206n), wherein each source circuit in the plurality of source circuits (206A, 206B, 206C,... 206n) represents a distinct output channel, and wherein the multichannel source circuit is configured to generate a constant current output for each source circuit in the plurality of source circuits (206A, 206B, 206C,... 206n), a plurality of loads (106A- 106 n), wherein each load in the plurality of loads (106A - 106n) is connected to a corresponding source circuit in the plurality of source circuits (206A - 206n) and is configured to receive the correspoding constant current output via the corresponding source circuit, characterized in that the controller is configured to generate an input to the reference voltage circuit, wherein the reference voltage circuit is configured to generate a reference voltage and to provide the reference voltage to the plurality of source circuits (206A, 206B, 206C,... 206n), and wherein the reference voltage is based upon the generated input, wherein the input is a pulse width modulation signal, wherein the reference voltage circuit comprises a first resistor and a first transistor coupled to a low side of the front end DC voltage, and a second resistor and second transistor coupled to a high side of the front end DC voltage, and wherein the reference voltage is a modified pulse width modulation signal based on the pulse width modulation signal. a front end circuit configured to receive an input voltage and to provide a regulated front end direct current voltage; a multichannel source circuit coupled to the front-end circuit, the multichannel source circuit comprising a controller, a reference voltage circuit, and a plurality of source circuits (206A, 206B, 206C,... 206n), wherein each source circuit in the plurality of source circuits (206A, 206B, 206C,... 206n) represents a distinct output channel, and wherein the multichannel source circuit is configured to generate a constant current output for each source circuit in the plurality of source circuits (206A, 206B, 206C,... 206n), a plurality of loads (106A- 106 n), wherein each load in the plurality of loads (106A - 106n) is connected to a corresponding source circuit in the plurality of source circuits (206A - 206n) and is configured to receive the correspoding constant current output via the corresponding source circuit, characterized in that the controller is configured to generate an input to the reference voltage circuit, wherein the reference voltage circuit is configured to generate a reference voltage and to provide the reference voltage to the plurality of source circuits (206A, 206B, 206C,... 206n), and wherein the reference voltage is based upon the generated input, wherein the input is a pulse width modulation signal, wherein the reference voltage circuit comprises a first resistor and a first transistor coupled to a low side of the front end DC voltage, and a second resistor and second transistor coupled to a high side of the front end DC voltage, and wherein the reference voltage is a modified pulse width modulation signal based on the pulse width modulation signal.