Design of CMOS O.T.A Using 180 Nm Technologies for High Frequency Applications

Swathi Gangula

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25-Dec-23

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Design of CMOS O.T.A Using 180 Nm Technologies for High Frequency Applications

Author(s):

Swathi Gangula , Vignan’s Institute of Management and Technology for Women, Hyderabad, Telangana, India

Keywords:

Figure of Merit, Gain, phase margin, C.M.R.R, P.S.R.R, O.T.A

Abstract:

This paper deals with well-defined design criteria of CMOS operational Transconductance amplifiers for high frequency applications. The high frequency OTA can be used as a basic building block in several RF as well as for microwave frequency applications. The performance analysis of conventional O.T.A techniques, using advanced process technology that can break the previous frequency barrier is a key objective of this paper. Operational transconductance amplifier is simulated using cadence 180nm technology Initially D.C analysis is performed to find region of operation of all the transistors , results show that all the transistors are perfectly operating in the saturation region .Theoretical analysis of O.T.A is provided which is very good agreement with measured results. The linearity and intermodulation distortion properties of the O.T.A, which are of particular interest in microwave applications, are experimentally carried out. Using single stage amplifier .For high frequency demonstration purpose we built larger circuit. The comparative analysis of the conventional CMOS based O.T.A and the proposed O.T.A is carried out. A power supply sensitivity simulation at different frequencies are carried out and observed that at low frequencies this O.TA has high power supply rejection ratio of over 86db and at microwave frequencies the PSRR drops to 30 – 40 dB To the impact of high frequencies on-chip shunt capacitors are usually introduced at dc power supply nodes in microwave IC’S shows that significant saving in power , can be obtained without compromising for phase margin and slew rate and little compromise in few characteristics like gain.