http://www.iaeme.com/IJECET/index.asp 7 editor@iaeme.com International Journal of Electronics and Communication Engineering and Technology (IJECET) Volume 8, Issue 5, September-October 2017, pp. 7–17, Article ID: IJECET_08_05_002 Available online at http://www.iaeme.com/IJECET/issues.asp?JType=IJECET&VType=8&IType=5 ISSN Print: 0976-6464 and ISSN Online: 0976-6472 © IAEME Publication TECHNIQUES TO IMPROVE DARLINGTON PAIR AMPLIFIER APPLICATIONS FOR HIGH DATA RATE COMMUNICATION SYSTEM Rashmi Singh Department of Electronics and Communication, National Institute of Technical Teachers Training and Research, Chandigarh, India Rajesh Mehra Head of the Department, Department of Electronics and Communication, National institute of Technical Teachers Training and Research, Chandigarh, India ABSTRACT In recent time, the demand for Darlington pair amplifier for high data rate communication system has been appreciated and highlighted. The application of Darlington pair amplifier is supported in a condition, where requirement of high gain at a low frequency is applicable. Recently, Darlington pair amplifier has been testified with high gain bandwidth product for current applications. If we need more current gain and more stability in any applications, Darlington pair amplifier has been suggested to be the best options. The Darlington pair amplifier has been indicated to possess many important properties such as high speed combined with less power consumption and use of less circuitry. In this review paper, authors summarize the techniques used to improve the gain and bandwidth of the Darlington pair amplifier Key words: Bandwidth enhancement, Broadband Darlington Amplifier, Circuit, HBT, HEMT, Multi-stage amplifier, Slew rate, Transistor. Cite this Article: Rashmi Singh and Rajesh Mehra, Techniques to Improve Darlington Pair Amplifier Applications for High Data Rate Communication System. International Journal of Electronics and Communication Engineering and Technology, 8(5), 2017, pp. 7–17. http://www.iaeme.com/IJECET/issues.asp?JType=IJECET&VType=8&IType=5 1. INTRODUCTION To switch on a transistor, the output of input current available is very low in case of some applications. This may be observed that a single transistor is unable to pass sufficient current essential by the load. The transistor gain is recommended to get enhanced, if it’s not possible to enhance the input current. This can be done by using a Darlington pair amplifier only [1- 30]. Darlington pair amplifier may be defined as the transistor in which two transistors are kept inside a single packet and whole configuration has high gain and high input impedance