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Thermal Conductivity Analyzer
Diode D1 effectively shorts the output to the inverting input for any
positive-going signals at the output of AlC, while D2 would not allow any
positive output at AlC to reach the circuit's output. Negative-going signals,
however, do not get through D1, but can go through D2, and R20 then acts
as a feedback resistor to set the gain of the circuit (to 4 in the example for
A1C). Since D2 is inside the feedback loop, its voltage drop does not
appear at the output. R6 sums a fraction of the -15 V supply to the input
voltage; the output of the circuit"is thus:
V
o
V
o
From this it can be seen that the circuit amplifies input voltages above
a cutoff voltage, and otherwise has zero output.
Figure 4-7: A Typical Line Segment Amplifier
= -R20 (V
/R7-15/R6)
in
= O
-R20 (V
/R7-15/R6) = O
in
V
= 15 x R7/R6
in
TELEDYNE BROWN ENGINEERING
Analytical Instruments
Linearizer 4
for V0 < O
if -R20 (V
/R7-15/R6) > O
in
or
4-11
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