Abstract
It is a highly tough undertaking to build an analogue circuit, especially one that consumes little power [1-5]. A basic component in many analogue integrated circuits like ADC, Gm-C filter and Delta Sigma modulator is the Operational Transcondactance Amplifier commonly known as the OTA. In all of these integrated circuits, the structure of the OTA is of fundamental importance. Gain Bandwidth (GBW), DC Gain, Common Mode Rejection Ratio (CMRR) and average power are performance characteristics that decide the selection of the OTA [6]. A well-designed OTA that has outstanding processing attributes such as speed, power consumption, gain and GBW is an accomplishment in itself [15]. This chapter mainly examines the performance parameters theoretically as well as analytically, which determines the design of OTA. Optimization strategies which are applicable to low voltage and low power applications, notably at the level of the transistor are also examined.
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