Theory of Operation
1710J-Series Waveform Monitors
5–21
This is an inverting amplifier with negative feedback. See Figure 5–6. R22 is the
feedback resistor while R7, R20, and R33 act to maintain the summing junction
at +5 V. Without any Z-axis input current, the amplifier output is approximately
+10 V. Negative Z-axis input current will cause the output to go positive.
–15 V
R22
37.4K
+100 V
R20
3.74K
R33
13K
R7
100K
Figure 5–6: Z-Axis amplifier
Q5 is a current amplifier feeding the output stage. Q3 and Q4 form a push-pull
output stage. Q3 acts as a 2.7 mA constant current pull-up, while Q4 is the
pull-down transistor. C6 speeds up the amplifier by coupling ac signals to the
base of Q3. CR2 and R41 protect the amplifier during CRT arcing.
Z-Axis Amplifier
Содержание 1710J Series
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