Implementation of a BiCMOS Bandgap Reference Source Based on Matching Improvement
Bo Xu, IC Design · Microelectronics · 2008
A temperature compensation method based on matching improvement was proposed,and a practical bandgap reference source with low temperature coefficient and high precision was implemented by using a new BiC-MOS low-voltage cascode circuit structure.Based on SMIC's 0.35μm mixed-signal technology,the circuit was simulated using HSpice and Cadence Spectre.Results from Monte Carlo simulation and process corner analysis showed that the matching improvement method was feasible.The circuit has a temperature coefficient of 8.85 ppm/℃in the temperature range from -40℃to 80℃,and a power sensitivity of about 0.516%.