New type of analogue multiplier with wide dynamic range

New type of analogue multiplier with wide dynamic range

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For reasons which are discussed in this letter, the dynamic range of existing transconductance-type analogue multipliers falls short of that imposed by device limitations when they are used in a constant-output mode. It is shown that, by employing a new type of circuit in the feedback path of an operational amplifier, a dynamic range of 86 dB can be obtained over a control range of 30 dB with less than 0.25% departure from linearity.


    1. 1)
      • R.H. Frater . Accurate wideband multiplier-square-law detector. Rev. Sci. Instrum. , 810 - 813
    2. 2)
      • R.R.A. Morton . A simple d.c. to 10 Mc/s analogue multiplier. J. Sci. Instrum. , 165 - 168
    3. 3)
      • Motorola application note AN-489, 1969.

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