Object Type:
diffamp
Description:
Difference amplifier, takes two inputs and produces an
output proportional to their difference.
Author:
M. Wilson, Caltech (2/89)
----------------------------------------------------------------------------ELEMENT PARAMETERS
DataStructure:
diffamp_type
Size:
96 bytes
Fields:
gain
saturation
plus
minus
output
[in src/device/dev_struct.h]
----------------------------------------------------------------------------SIMULATION PARAMETERS
Function:
DifferenceAmp
Classes:
device
Actions:
RESET
PROCESS
[in src/device/diffamp.c]
sets the output to zero
calculates and sets the output from the
inputs
Messages:
PLUS +input
MINUS -input
GAIN gain
----------------------------------------------------------------------------Notes:
Adds inputs from PLUS messages and subtracts those received with MINUS
messages. The output is this total, multiplied by gain, but limited to
the
range -saturation to +saturatation. If there are no MINUS messages, the
minus input is taken as zero. Normally, the gain field is set using
"setfield", but it may also be varied with a GAIN message. This object
also
provides a convenient way to sum or scale quantities which are to be
plotted
by sending a PLOT message to an xgraph.
Example:
See also: