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A precision control circuit for variable-gain amplifiers

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1 Author(s)
Ciubotaru, A.A. ; Dept. of Electr. Eng., Texas Univ., Arlington, TX, USA

The author describes a circuit that precisely controls the gain of one or more single-ended amplifiers by means of a corresponding number of Gilbert quads. The circuit employs a configuration consisting of a differential pair with two negative feedback loops and is used in conjunction with a precision potentiometer to generate a DC gain-control voltage as a function of its setting. The gain-control characteristic accurately mimics the potentiometer's function of resistance versus wiper position to achieve a control range in excess of 55 dB. Experimental results are provided for the frequency response and the gain-control characteristic of the amplifiers

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Circuits and Systems I: Fundamental Theory and Applications, IEEE Transactions on  (Volume:43 ,  Issue: 9 )