The most important point of above description is how to control
P
point voltage, when it will be
"
l", and
when it will be "0". In FIGURE
6-3
there are two comparator at left side, and one SR flip-flop at right
side.
To examine truth table of SR flip-flop when
S= 0, R= 1,
Q
constantly is 0. When S= 1, R=O,
Q
constantly
is 1. Now to prevent status of flip-flop from being confused (i.e. S=R). If S=E, R=s, when S= 1, R=O or
S=O
R= 1, therefore to connect constantly the inverter input of
A
comparator with
+
lV, and the non-
inverter input of
B
comparator
with
-1V.
Vin
-lv
Vin
0
FIGURE
6-3
-lV
When Vin voltage exceed
+
lV,
A
comparator output is positive and
B
comparator output is negative.
i.e. S=l R=O, so Q=l, Q=O. When Vin voltage less than -1V,
B
comparator output is positive and
A
comparator output is negative. i.e. R=l, S=O, so Q=O, n=1. From this result we can get the action of Q
matching request of controlling voltage
P
point shown
in
figure
6-2.
Doing this way Circulatively can
obtain triangle wave.
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