Patent ID: 7737675
Filing Date: 2010-06-15
Classification: G05F

Abstract:
1. A reference current generator for generating a current substantially proportional to absolute temperature, comprising: an operational amplifier for generating the current substantially proportional to absolute temperature; an output circuit for outputting the current substantially proportional to absolute temperature delivered from said operational amplifier; a variable current source connected to an output of said operational amplifier for producing a variable current to vary the current substantially proportional to absolute temperature, said variable current source comprising a plurality of transistors; and a plurality of switches for selecting said plurality of transistors, said plurality of switches being selected to thereby generate the variable current, said third resistance element being connected to said variable current source to utilize a voltage drop across the third resistance element to cause said output circuit to output the current substantially proportional to absolute temperature, said second resistor and third resistor having the same resistance values as each other.