October 2013
Beginner to intermediate
152 pages
5h 10m
English
Content preview from Operational Amplifier Circuits
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68 OPERATIONAL
AMPLIFIER
CIRCUITS:
ANALYSIS
AND
DESIGN
The only, but important, effect of a is on the nature of the gain and phase
characteristics in the vicinity of co
o
(where co/co
o
=
flf
Q
=1). Those values of a
that have particular properties have been specifically named as follows:
1.
Bessel filter. In some applications it is desirable that all frequency
components of the signal should be delayed by an equal amount. It can be
shown (see, for example, Brown and Glazier 1974, 80) that this occurs when
the variation of phase with frequency is linear. The second-order Bessel filter
(a = 1.73) closely meets this requirement. However, its amplitud ...
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