Comparative Analysis of CMOS OTA

Abstract

The Operational Transconductance amplifiers are significant building blocks for different analog circuits and systems which were previously implemented by using OPAMP. Recently, research is going on for implementing OTA circuits which will be highly linear, consumes lesser power and operate at lower supply voltage. Previous OTAs seldom worked over 200MHz whereas, the higher frequency OTA can be used as basic building block in several RF as well as microwave applications. The performance analysis of conventional OTA techniques and suggesting the topology, using advanced process technology that can break the previous frequency barrier is a key objective of this paper. Study and Analysis of different OTA topologies has been done. The appropriate topology is suggested which has a perfect balance between complexity and performance. The research includes analysis and comparison of OTA topologies from the point of view of effect of technology scaling on various performance parameters such as transconductance, supply voltage, Power consumption, dc gain, Frequency range, etc.