Miscellaneous active electrical nonlinear devices – circuits – and – Signal converting – shaping – or generating – Rectangular or pulse waveform amplitude control
Patent
1995-07-26
1997-12-02
Callahan, Timothy P.
Miscellaneous active electrical nonlinear devices, circuits, and
Signal converting, shaping, or generating
Rectangular or pulse waveform amplitude control
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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Kasashima Masaaki
Nakamura Hiroshi
Callahan Timothy P.
Nu Ton My-Trang
OKI Electric Industry Co., Ltd.
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