瓷片电容中心谐振频率计算公式
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For MuRata capacitors
Cspecified = 0.5 pF to 18000 pF. W x L = 50 x 80 mils and 30 x 40 mils
f
=
SRF c
=
5400 C
;
C = Cspecified
where SRFc = Self resonant frequency in MHz; Cspecified= Specified capacitance by the manufacturer in pF.
Lecture 7: Grounding
Richard Li,2011
13
o Selection of the “Zero” Capacitor from Chip Capacitors
Theory
Zc
=
1 jCω
Chip “zero” capacitor
C
Zc
=
1 jCω
+
jLSω + rS
LS
C
rS
Fra Baidu bibliotek
(a) An actual chip capacitor
(b) Equivalent of an actual capacitor
Figure 11 An actual chip capacitor and its equivalent
When
the
operating
frequency
f
f
is equal
= SRFc =
to the self
1
2π LSC
resonant
,
frequency
SRFc,
that
is
then
ZC => rS