2
Fig. 1. Differentiation in an Amplifier Without Pole-Zero Cancellation.
Fig. 2. Differentiation in a Pole-Zero Cancelled Amplifier.
Pole-zero cancellation is accomplished by the
network shown in Fig. 2. The pole [s + (1/T
o
)] due to
the preamplifier pulse decay time is cancelled by
the zero of the network [s + (k/R
2
C
1
)]. In effect, the
dc path across the differentiation capacitor adds an
attenuated replica of the preamplifier pulse to just
cancel the negative undershoot of the
differentiating network.
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