Patent ID: 9535445
Date: 2017-01-03
CPC Classifications: G05F

Claim:
1. A circuit, comprising: a current source; a plurality of first transistors coupled in parallel to the current source such that each first transistor conducts a target current; a plurality of second transistors matched to the plurality of first transistors; a plurality of switches corresponding to the plurality of second transistors, each switch being coupled in series with its corresponding second transistor, wherein the plurality of second transistors and the plurality of first transistors comprise a current mirror such that each second transistor conducts the target current when its corresponding switch is on; a control logic circuit configured to cycle the switches on and off with regard to frames over a current generation cycle such that each switch is on in the same number of frames in the current generation cycle, wherein the control logic circuit comprises a shift register having a plurality of flip-flops corresponding to the plurality of switches, wherein each flip-flop is configured to control its corresponding switch; a bipolar junction transistor temperature transducer; and an Analog-to-Digital Converter (ADC) configured to digitize a voltage across the bipolar junction transistor temperature transducer to produce a digitized voltage, and to drive the control logic circuit with the digitized voltage.