CSEIT1951191 | Received : 02 Jan 2019 | Accepted : 25 Jan 2019 | January-February -2019 [ 5 (1) : 574-585 ] International Journal of Scientific Research in Computer Science, Engineering and Information Technology © 2019 IJSRCSEIT | Volume 5 | Issue 1 | ISSN : 2456-3307 574 Implementation and Characterization of High Slew Rate CMOS Op-Amp Dr. Priyesh P. Gandhi General Manager, Prakruti Consultancy Services, Vadodara, Gujarat, India ABSTRACT Operational Amplifiers (Op-Amp) are one of the most widely used building blocks for analog and mixed-signal systems. They are employed from dc bias applications to high speed amplifiers and filters. Different architectures like Two-Stage Op-Amp and Folded Cascode Op-Amp are simulated with different characteristics like slew rate, offset voltage, gain. For improving the slew rate, few modifications are carried out by adding current replication branch and auxiliary circuits in Op-Amp. Keywords : Operational Amplifiers (Op-Amp), Slew Rate, CMOS, Propagation delay, Offset Voltage, Power Dissipation. I. INTRODUCTION An Operational Amplifier is a high-gain direct- coupled amplifier that is remarkably used in feedback connections. The word Operational Amplifier evolved from original applications in analog computation where the circuits are used to perform various mathematical operations like summation, integration, subtraction & derivation. Due to the performance and economic advantages of available units, present applications extend far beyond from the original applications, modern Op-Amps are used as general purpose analog data-processing elements. [12] . The range of Op-Amp usage began to expand toward the present spectrum of applications in the early 1960s because various manufacturers were developing modular, solid-state circuits. As the improvement in processing and designs, the integrated circuit will invade more areas once considered exclusively the domain of the discrete design, and it is probable that the days of the discrete-component circuit, except for specials with limited production requirements, are numbered.[13] Figure 1. Circuit symbol of Op-Amp An Operational Amplifier (Op-Amp) is an integrated circuit (IC) which operates as a voltage amplifier. It has a differential input. That mean, it has two inputs which are in opposite polarity. An Op-Amp has a very high gain and single output, which means that the output signal is a large amount than input signal. An Op-Amp is regularly represented in a circuit diagram as shown in figure 1. The Op-Amp has many other applications in signal processing, measurement, and instrumentation etc.