Asad Abidi References Supplied on Request Paul Brokaw's stamp on analog IC design P aul Brokaw may be known to most IC de--signers as the inventor of the industry standard two-transistor bandgap voltage reference named after him, but Brokaw has made many Digital Object Identifier 10.1109/MSSC.2020.3039399 Date of current version: 25 January 2021 28 W I N T E R 2 0 2 1 distinct contributions to circuit design and the culture of design, all of which have left a strong and lasting legacy. Among IC designers, Paul Brokaw is one of the greats. Every mixed-signal IC uses a voltage reference. Except for a very few that use a buried Zener diode that requires special masks for fabrication, all of the rest are Brokaw's bandgap circuit [1] (cited ~600 times). Even voltage references in CMOS cannot be built without IEEE SOLID-STATE CIRCUITS MAGAZINE two p-n junctions (usually parasitic bipolar transistors) biased at unequal current density and configured as a variant on Brokaw's circuit. This came fast on the heels (within 1.5 years) of Kuijk's first description of the bandgap principle with a three-transistor circuit. But Brokaw's circuit (Figure 1) allowed the output to be defined by a resistor ratio, as a multiple (greater than one) of the 1943-0582/21©2021IEEE