Browse Prior Art Database

Digital Simulation Amplitude

IP.com Disclosure Number: IPCOM000099290D
Original Publication Date: 1990-Jan-01
Included in the Prior Art Database: 2005-Mar-14
Document File: 3 page(s) / 82K

Publishing Venue

IBM

Related People

Cruz, S: AUTHOR [+6]

Abstract

This article describes a digital simulation controller (DSAC) circuit arrangement which allows upper and lower rails of multiple logic signals to be to test limits on hardware performance in an vehicle.

This text was extracted from an ASCII text file.
This is the abbreviated version, containing approximately 60% of the total text.

Digital Simulation Amplitude

       This article describes a digital simulation controller
(DSAC) circuit arrangement which allows upper and lower rails of
multiple logic signals to be to test limits on hardware performance
in an vehicle.

      When performing a functional or engine voltage tolerance test,
voltage tolerances must be tested for all signals.  The DSAC
disclosed herein tests the limits voltage tolerance specifications
for the engine parameter (EPC) and the flywheel datacard (FDC) which
are two cards for an engine analyzer.  The FDC receives signals and
the EPC receives the same three signals one additional signal.

      Referring to Fig. 1 which is a circuit diagram of the a
software simulator provides four standard logic (TTL) signals that
are used the DSAC.  Each signal requires two independent switches for
logic high level and one for logic level) and its own identical
control circuit.  Each has three positions for setting the voltage
levels. one switch level circuit is needed per controller, as in Fig.
2.  Theoretically, any number of switch and signals could be
simulated as the design can easily expanded.

      An inverting summer U1 provides an offset to the SIGNAL  This
guarantees that transistor Q1 will saturate and off with the varying
input while the followers U2 and U3 the desired logic rail voltages.
Diode D1 fast switching speeds at the output by not allowing to be
more than one diode drop below ground.  This causes to o...