A Review About Analysis and Design Methodology of Two-Stage Operational Transconductance Amplifier (OTA)

Abstract

This article represents the analysis about OTA properties and its behavior. It is an essential building block analog circuit implemented using OP-amp. The two-stage OTA design methodology is based on sub-optimal method because it distinguishes its inter-related parameters such as settling time, performance parameters, and noise. The OTA circuit uses the methodology based on automatic selection and sizing of analog circuits. It is divided into two parts and for the part sizing process as well as final size uses a generic topology method. This circuit topology distribution is based on reuse library which is classified in the topology tree. It is most common region in which OTA using by the researchers because of it provides a highly linear properties, needs less operating supply voltage and having low power dissipation. Previous OTA’s only work up to 200 MHz frequency, but in recent time, it works on RF and microwave both applications. The proposed topology is providing a balance in between the performance and complexity both. For the comparison of OTA technologies, some parameters should kept in mind such as technology scaling on different-different parameters such as frequency range, power supply, transconductance, DC gain, and power consumption.