International Journal of Electronics and Communication Engineering & Technology (IJECET), ISSN 0976 – 6464(Print), ISSN 0976 – 6472(Online) Volume 4, Issue 3, May – June (2013), © IAEME 24 DESIGN & CHARACTERIZATION OF HIGH SPEED POWER EFFICIENT CMOS COMPARATOR Priyesh P. Gandhi 1 , Dhanisha N. Kapadia 2 , N. M. Devashrayee 3 1 (EC Dept., Institute of Technology, Nirma University, Ahmedabad, India) 2 (EC Dept., L. C. Institute of Technology, Bhandu, Gujarat Technological University Ahmedabad, India) 3 (EC Dept., Institute of Technology, Nirma University, Ahmedabad, India) ABSTRACT In this paper authors have design the High Speed Power Efficient CMOS Voltage Comparator which can be realized in A/D Converters. The simulation is carried out in 130nm and 90nm technologies. The supply voltage for this comparator is 1v and 0.9v for 130nm and 90nm respectively. The Characterization of comparator is done in terms of offset, ICMR, propagation delay, power dissipation in both the technologies and the result has been compared for both the technologies. The simulation results shows that the speed of 1.92GHz and 2.44GHz with the power dissipation of 9.19W and 7.45W was achieved in 130nm and 90nm technologies respectively. Index Terms: Buffer stage, Current Sensing Comparator, Latch Comparator. I. INTRODUCTION A Comparator is a circuit which compares the two analog signal and depending on the comparison gives the output either logic ‘1’ or logic ‘0’. The comparators are widely used in ADC. In fact, comparator is also called as 1 bit ADC. In conventional design, in order to reduce the input offset voltage preamplifiers were added before the comparator, but ultimately this increases the power consumption. Therefore, a latched comparator is a good alternative for low power consumption and high-speed operation. There are three types of comparator which can provide high speed, such as multistage open loop comparator, the dynamic latch comparator, and the preamplifier-latch comparator. The multistage open loop INTERNATIONAL JOURNAL OF ELECTRONICS AND COMMUNICATION ENGINEERING & TECHNOLOGY (IJECET) ISSN 0976 – 6464(Print) ISSN 0976 – 6472(Online) Volume 4, Issue 3, May – June, 2013, pp. 24-32 © IAEME: www.iaeme.com/ijecet.asp Journal Impact Factor (2013): 5.8896 (Calculated by GISI) www.jifactor.com IJECET © I A E M E