ANALYSIS OF CMOS BASED APPLICATION ON CIRCUIT SIMUALTOR

Abstract

In communication systems the data signal gets deteriorated while passing through the transmission medium to the receiver. It becomes difficult for the receiver to retrieve data from this signal since its too weak . This deterioration is often caused due to interference of noise present in the transmission medium . Therefore a low noise amplifier is used at the first stage of the receiver .This amplifier not only strengthens the data signal but also adds minimum noise possible. A good low noise amplifier should have low noise figure, high gain, high linearity, high stability , less sensitivity , and less area. All these attribute are not perfectly best in a practical LNA . Thus engineers design LNAs according to specifications and rely on trade of between different factor to achieve their goals. In this thesis we have worked on a existing LNA circuit and tried to improve its power consumption while keeping the noise figure same and trading off the gain. Also this LNA has been implemented on Cadence Virtuoso at 90nm technology . Use of Current mode to build ciruit has become a choice over voltage mode. This is because current mode can have many advantages like better bandwidth , better gain, better linearity, lower power consumption. In this thesis a have implement and verified a differential difference current conveyor transconductance amplifier (DDCCTA) using LTSPICE.