Attenuator circuit employing bootstrapping

Details Attenuator circuit employing bootstrapping Attenuator circuit employing bootstrapping

1987-02-25

1988-11-22

Mullins, James B.

Amplifiers

Variable impedance for signal channel controlled by separate...

Electron tube or diode as impedance

330149, 330156, 330284, 333 14, H03F 126, H03G 700

Patent

active

047868791

ABSTRACT:
When impedance elements such as FETs are used in attenuators, the elements have linear responses only when the signals attenuated are below certain signal levels. When signal conditions causing the element to operate non-linearly are detected, bootstrapping is applied to reduce the voltage across the element so that the element will operate linearly. The control signal at the gate of the element is then modified to compensate for the increase in effective impedance of the element caused by bootstrapping. The improved attentuators are especially useful in signal compressors and expanders.

REFERENCES:
patent: 4137466 (1979-01-01), Schemmel et al.

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