Fast Active Differentiator Featuring Low Non-Linear Distortions

Authors: Volkov I.V., Fokin Yu.M., Khalzev S.E. Published: 28.11.2017
Published in issue: #6(117)/2017  
DOI: 10.18698/0236-3933-2017-6-40-53

Category: Instrument Engineering, Metrology, Information-Measuring Instruments and Systems | Chapter: Telecommunication Systems, Networks and Devices  
Keywords: circuit diagram, differentiators, THD, SNR, frequency response, non-linearity, distortions, performance, delay, feedback, prediction, simulation in circuit design

We developed a circuit diagram for an active differentiator intended to process continuous analogue signals, featuring low non-linear distortion and a small output delay in the "high" input signal mode. The performance of the differentiator and its good high-frequency chracteristics result from the dynamic performance of a single-transistor amplifier stage in a common-gate circuit featuring a steeper slope, and its high linearity is a result of increasing this parameter by means of an auxiliary amplifier featuring a high gain factor. We present the results of simulating various types of differrentiators. We compare the main dynamic parameters (THD and SNR) of these differentiators by plotting them as functions of the input signal frequency


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