Before revision: This circuit is named after its inventor, Bob Widlar, and was patented in 1967.RJ Widlar: US Patent Number 03320439; Filed May 26, 1965; Granted May 16, 1967: Low-value current source for integrated circuitsSee Widlar: Some circuit design techniques for linear integrated circuits and Design techniques for monolithic operational amplifiers Analysis 250px|Figure 1: A version of the Widlar current source using bipolar transistors.
After revision: DCThis circuit is named after its inventor, Bob Widlar, and was patented in 1967.RJ Widlar: US Patent Number 03320439; Filed May 26, 1965; Granted May 16, 1967: Low-value current source for integrated circuitsSee Widlar: Some circuit design techniques for linear integrated circuits and Design techniques for monolithic operational amplifiers Analysis 250px|Figure 1: A version of the Widlar current source using bipolar transistors.