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Pulse Generator Having Exponentially Varying Pulse Widths

IP.com Disclosure Number: IPCOM000099474D
Original Publication Date: 1990-Jan-01
Included in the Prior Art Database: 2005-Mar-14
Document File: 2 page(s) / 52K

Publishing Venue

IBM

Related People

Trudgen, GA: AUTHOR

Abstract

The width of output pulses form a single shot can be varied exponentially along either positive or negative transfer slopes with respect to a linear input signal.

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Pulse Generator Having Exponentially Varying Pulse Widths

       The width of output pulses form a single shot can be
varied exponentially along either positive or negative transfer
slopes with respect to a linear input signal.

      A circuit for obtaining an exponentially varying duration of an
output signal from a linear input signal is shown in Fig. 1.  For a
positive slope transfer characteristic, a fixed voltage V is applied
at input 2 and input 1 is driven by some fraction of V, such as
V/K. Latch 3 is set by a negative pulse at trigger 4, causing the
latch output to go positive.  This turns comparator 5 off, allowing
capacitor 6 to exponentially charge toward voltage V through resistor
7.  When the capacitor voltage exceeds the control voltage of
comparator 8, the latter switches negative, turning off latch 3.
This action completes the timing interval and turns the output of
comparator 5 on, discharging capacitor 6 to ground.  The output of
comparator 8 switches positive, returning to its quiescent state
awaiting the next trigger pulse.  As the control voltage at input 1
changes with respect to the charge voltage of capacitor 6, the width
of the output pulse varies from latch 3.

      For a negative slope transfer characteristic, fixed voltage V
is applied at input 1 while input 2 is driven by a multiple of V,
such as KV.  The exponentially dependent output pulse width of latch
3 is altered by varying the control voltage toward which capacitor 6...