A Simple Square Rooting Circuit Based on Operational Amplifiers (OPAMPs)

  • K. C. Selvam Department of Electrical Engineering, Indian Institute of Technology Madras, India
  • S. Latha Department of Electrical Engineering, Indian Institute of Technology Madras, India
Keywords: square-rooting, generators, comparators, switches, low-pass filters


A simple circuit which accepts a negative voltage as input and provides an output voltage equal to the square root of the input voltage is described in this paper. The square rooting operation is dependent only on the ratio of two resistors and a DC voltage. Hence, the required accuracy can be obtained by employing precision resistors and a stable reference voltage. The feasibility of the circuit is examined by testing the results on a proto type.


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