Physics and Engineering of Radiation Detection

8.3. Pulse Shaping 489

Stage−1 Stage−2

Figure 8.3.10: Step input response of a typical two-stage semi-Gaussian pulse

shaper.

Such a shaper is called semi-Gaussian because the output pulse has a Gaussian-
like shape (see Fig.8.3.11). The shaper could be designed to have unipolar or bipolar
outputs. Generally unipolar output is preferred due to a much better signal to noise
ratio.

Time

Pu

lse He

ig

ht

(a)

Time

Pu

lse

H

ei

gh

t

(b)

Figure 8.3.11: (a) Unipolar and (b) bipolar

outputs of a semi-Gaussian pulse shaper.

8.3.D Semi-TriangularPulseShaping

The semi-Gaussian pulse shaper we discussed earlier is one of the most popular cir-
cuits used in radiation detection systems. If a number of such circuits are connected