• Nilima Warke
• J. M. Nair
• P. P. Vaidya

This paper proposes the new design of three-stage instrumentation amplifier consisting of five op-amps. A new stage has been added at the input of conventional instrumentation amplifier (IA) which consists of two op-amps and associated circuit to compensate DC offset voltages present in the signal applied at the input of IA. This method makes use of injection of external currents using constant voltage sources. In this proposed configuration, it is possible to compensate for large values of the offset voltage without degrading frequency response of IA. The IA using this method was constructed and tested, and results have been reported in the paper. Experimental results show that the proposed three-stage IA can be used to compensate unwanted DC offset voltages present in the input signal without affecting its differential gain and common mode rejection ratio (CMRR) characteristics with significant improvement in dynamic range. Unlike RC coupled IA, this IA circuit does not require matched components for superior performance and also results in better frequency response and wide dynamic range.

Three-stage instrumentation amplifier, frequency response, differential gain, CMRR, dynamic range

"A Novel Design Of Three-Stage Instrumentation Amplifier For Improvement Of Dynamic Range And Frequency Response", International Journal of Emerging Technologies and Innovative Research (www.jetir.org), ISSN:2349-5162, Vol.6, Issue 5, page no.480-484, May-2019, Available :http://www.jetir.org/papers/JETIR1905271.pdf

"A Novel Design Of Three-Stage Instrumentation Amplifier For Improvement Of Dynamic Range And Frequency Response", International Journal of Emerging Technologies and Innovative Research (www.jetir.org | UGC and issn Approved), ISSN:2349-5162, Vol.6, Issue 5, page no. pp480-484, May-2019, Available at : http://www.jetir.org/papers/JETIR1905271.pdf