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CHAPTER 5
QUARTER-SQUARE MULTIPLIERS
5.1
INTRODUCTION
This chapter provides information on the operation of the quarter-square multi-
pliers used in the 580 Computer.
The multipliers available in the 580 Computer
include the 0.7.0146 High Accuracy Quarter-Square Multiplier, the 0.7.0148 Quarter-
Square Multiplier, and the 0.7.0150 Quarter-Square Multiplier (Figure 5.1).
Each of these multipliers are used in conjunction with dc amplifiers to pro-
duce a four quadrant product of two variables, X and Y.
In addition to multi-
plication, each of the multipliers is also capable of division.
The upper
multipliers in the 0.7.0146 and 0.7.0148 Trays are provided with extra patching
terminals to permit patching each squaring circuit separately (Figure 5.2a).
This provision allows the upper multipliers in these trays to be utilized,
additionally, for squaring and square root fUnctions.
5.2
MODEL 0.7.0146 AND 0.7.0148 QUARTER-SQUARE MULTIPLIERS
Since the patch blocks and patching procedures for the 0.7.0146 and 0.7.0148
Quarter-Square Multipliers are identical, only the 0.7.0146 is described below.
Figure 5.2 is a simplified diagram of the multiplier.
Note that the multiplier
is patched to an amplifier in a typical configuration.
The inputs are not shown
'patched to simplify the diagram.
The function of each input terminal is given
in Table 5.1.
Table 5.1.
Multiplier Input Functions
Patch Terminal
Function
Destination
lA
+X
+
squaring card in upper
lB
+y
multiplier
lC
-X
-
squaring card in upper
lD
-Y
multiplier
2C
+X
+
squaring card in lower
2B
+Y
multiplier
2A
-X
-
squaring card in lower
2D
-Y
multiplier
Figures 5.3 through 5.6 show multiplier patching for multiplication, division,
squaring, and square root functions respectively.
Note that each multiplier
(upper and lower) has only one feedback resistor.
For squaring and square roots
functions (Figures 5.5 and 5.6) the upper squaring cards are patched separately.
The output amplifiers patched to
YJ
in the 0.7.0146 Multiplier must have an
external feedback resistor patched.
A feedback resistor (3.55K ohms) is pro-
vided for this purpose in the 0.7.0148 Multiplier.
5-1
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