Variable resistor and gain control circuit and integrated circui

Miscellaneous active electrical nonlinear devices – circuits – and – Signal converting – shaping – or generating – Rectangular or pulse waveform amplitude control

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330254, H03G 330

Patent

active

056940696

ABSTRACT:
A gain control circuit according to the present invention comprises an amplifier circuit for controlling gain thereof to amplify an input signal and a control circuit. The amplifier circuit includes an input terminal for inputting the signal, a first transistor having a drain electrode connected to a first potential through a first resistive means and a source electrode connected to a second potential, and an output terminal connected to a first electrode and varies the value of a resistance between the source and drain of the first transistor based on the signal supplied to the input terminal. The control circuit is composed of a second transistor having a source electrode connected to the source of the first transistor, a drain electrode connected to the drain of the first transistor and a gate electrode supplied with a control signal and varies the value of a resistance therebetween based on the control signal supplied to the gate electrode. Thus, since the gain control circuit is simple in structure, it can be activated at a low voltage and can realize a wide gain control range. It is also possible to achieve a gain control circuit whose output does not have distortion.

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Alan B. Grebene, "Bipolar and MOS Analog Integrated Circuit Design", John Wiley & Son, 1984, pp. 443-449.

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