Based on the noise characteristics of electron multiplying CCDs

selecting suitable operation mode is favorable to make devices work at best state and obtain optimum image quality. This paper introduces the operation principle of inverted mode and non-inverted mode. The performance of dark current and clock induced charge is analyzed and compared under different operation modes. A mathematical model of optimum operation mode is constructed

taking operating temperature

integration time and total number of parallel transfers as parameters. Integration critical point is calculated and optimum operation mode is determined. According to the parameters of practical devices

the noise performance curve under optimum operation mode is simulated. The result offers the reliable theoretical basis for the operation mode selection of electron multiplying CCDs. It is of vital directive significance to the application and design of electron multiplying CCDs.