Apparatus for smoothing an abrupt change in signal level
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United States of America Patent
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Aug 22, 1989
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N/A
app pub date -
Nov 6, 1985
filing date -
Nov 6, 1985
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Expired
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Abstract
An apparatus for smoothing an abrupt change in signal level generates a control signal having a curvilinear ramp shape. An amplifier has a step input signal applied to a non-inverting input, a delayed slope control signal applied to a bias terminal, and the output of the amplifier fed back to an inverting input. An RC series circuit is connected between the output of the amplifier and a reference potential, with the control signal taken from the node between the resistor and capacitor. The amplifier is saturated by the step input signal, and is subsequently turned on by the delayed slope control signal so that the amplifier acts initially as a current source for the RC circuit until the slope control signal reaches its full value. Then the RC circuit charges linearly until the intercept voltage of the step input is approached, at which point the amplifier comes out of saturation and acts as a voltage source to exponentially charge the capacitor to the intercept voltage.
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