Patent ID: 8188784

Claim:
A system for providing a desired power to a load, the system comprising: a current detection module configured to generate a current signal based on a current flowing through the load; a voltage detection module configured to generate a voltage signal based on a voltage across the load; a multiplier module configured to generate an output signal based on an analog multiplication of i) the current signal and ii) the voltage signal; a comparing module configured to perform a comparison of the output signal to a power reference signal, wherein the power reference signal is based on the desired power; a voltage source configured to control the voltage across the load based on the comparison of the output signal to the power reference signal; and a reference voltage generator configured to generate a reference signal based on the comparison of the output signal to the power reference signal, wherein: the voltage source is configured to generate the voltage across the load based on the reference signal, the reference signal is differential and comprises two single-ended reference signals, and the voltage source comprises: two operational amplifiers with first inputs, second inputs, and outputs, respectively, and two voltage-controlled current sources with control terminals in communication with a respective one of the outputs of the two operational amplifiers.