Input limiting module for voltage signals of variable amplitude

摘要

An input limiting circuit module (2) for voltage signals (1) of variable amplitude has a voltage divider (7) of controllable ratio formed by a field effect transistor and fixed resistor which operates in conjunction with a peak voltage sensor (8) which latter exerts a controlling influence on the divider ratio via a feedback connection. In this way all incoming signals (1) are subjected to a standardising process which restricts their amplitude but preserves their contour. A low pass filter (4) transfers the standardised signal to an output stage (5) in which its analogue form is converted to a digital equivalent of the same frequency (6) for further use.