International Research Journal of Engineering and Technology (IRJET) Volume: 09 Issue: 06 | Jun 2022
www.irjet.net
e-ISSN: 2395-0056 p-ISSN: 2395-0072
DESIGN OF 8-BIT COMPARATORS 1. MADHURI.
G. M. G, 2. RAJYA LAKSHMI. Y, 3. KATYAYANI. J. V. N. P, 4. NAVEEN. M, 5. TARUN. K
1Associate Professor, Dept. of ECE, Potti Sriramulu Chalavadi Mallikarjun Rao college of Engineering & Technology, Andhra Pradesh, India. 2,3,4,5 Dept. of ECE, Potti Sriramulu Chalavadi Mallikarjun Rao college of Engineering & Technology, Andhra Pradesh, India. ---------------------------------------------------------------------***--------------------------------------------------------------------They are mainly Abstract - The purpose of this paper is to study different types of comparators as they are used in many electronic circuits to find the threshold levels of voltages or currents. The comparators output will give highest and lowest numbers among the applied inputs. The proposed comparators here use the subtractor as we easily say whether the value is greater or lesser based on the borrow generated. The software used to design these comparators is Xilinx Vivado. The results of various comparators designed are compared in terms of their power, number. of cells etc., The purpose of this paper is to study different types of comparators as they are used in many electronic circuits to find the threshold levels of voltages or currents. The comparators output will give highest and lowest numbers among the applied inputs. The proposed comparators here use the subtractor as we easily say whether the value is greater or lesser based on the borrow generated. The software used to design these comparators is Xilinx Vivado. The results of various comparators designed are compared in terms of their power, number. of cells etc.,
1.Conventional Bit-wise Comparator. 2.Borrow Look Ahead Comparator. 3.Mux-Based data Comparator.
2. COMPARATOR DESIGN The design of comparators involves the designing of processing elements used in it and mux interface at the output of these cascaded processing elements. The design of comparators is shown below. 2.1.DESIGN OF COMPARATOR
CONVENTIONAL
BIT-WISE
This traditional data Comparator employs the operation similarly to a word Comparator. As a processing element, a 1-bit magnitude comparator is used. To implement 8-bit comparator, 8 processing elements of 1 bit comparator are considered. All the 3 possible ways are a>b, a<b, and a=b represented as the outputs.
Key Words: PE - Processing Element; CBDC Conventional Bit-wise Data Comparator; Design of Borrow Look Ahead Data Comparator (BLAC); Design of Mux Based Data Comparator (MDC).
1. INTRODUCTION The comparators are the devices that are used in the electronic circuits to find the threshold levels to give an input and also to compare the results of output with some predefined value to check whether the output is at expected level or not. The basic comparator is a conventional bit-wise comparator that compare the bits and gives the result as one of the numbers is greater or less or equal to the other. The comparators uses subtractor as one of the processing element. Mux is also used in this comparator design to give the outputs depending on the borrow from the subtractor. In this paper we have designed different types of data comparators that are used in various circuitry like NullDetector, Zero-Crossing Detector, Relaxation Oscillator, Level Shifter, Analog to Digital Converters, Window Detectors, BLDC Operating Motors, Switching Power Regulators and also in Peak Detectors.
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Fig 2.1 Schematic of the Conventional Bit-Wise Comparator The operation of the comparator is shown by a tabular model to understand it’s working in a easy way. When the inputs meet the condition then the values in the table are highlighted.
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