Model for electrical simulation of photogate active pixel sensor

Abstract

A new electrical simulation model for photogate active pixel sensor in CMOS imagers is proposed. Review of three conventional models is done and shows lack of accuracy. Therefore photoelectric mechanisms and charges transfer of photogate pixel are analysed and lead to the definition of a Verilog-A description model. This model is then simulated into the Cadence design tool environment and simulation results show great improvements in simulation accuracy of the proposed model versus others ones.