Overview of OPAMP and OTA based Integrators

Abstract: The circuit realization of lossless and lossy integrators using active devices like opamp and OTA have been discussed. The realization of integrator in single ended and fully differential configurations is considered. The voltage- mode and current-mode integrators reported in the literature have been considered. The realization of OTA-based transadmittance type integrator has been considered. The OTA based integrator circuits have been simulated in PSPICE using a behavioral macro-model of the OTA as well with a practical CMOS OTA circuit. The amplitude and phase response plots obtained for OTA based integrators are presented.

Keywords: Opamp; Operational Transconductance Amplifier (OTA); Lossless and lossy integrator; Voltage-mode and current-mode integrator