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參數(shù)資料
| 型號(hào)： | AN957 |
| 廠商： | Electronic Theatre Controls, Inc. |
| 英文描述： | Measuring HEXFETCharacteristics |
| 中文描述： | 測(cè)量HEXFETCharacteristics |
| 文件頁數(shù)： | 8/13頁 |
| 文件大?。?/td> | 235K |
| 代理商： | AN957 |
AN-957
(v.Int)
Figure 17.
Test circuit for input capacitance
Figure 18.
Test circuit for output capacitance
C
iss
, C
oss
, and C
rss
. Output,
Input
and
Transfer Capacitances
Reverse
A 1 MHz capacitance bridge
is used for all these tests.The
capacitance to be measured
is connected in series with a
capacitance of known value
to provide dc isolation. If C
u
is the unknown capacitance,
C
k
is the known capacitance,
and C
m
is the measured
capacitance, then C
u
can be
calculated as follows:
(1)
Figures 17, 18 and 19 show the circuit connections for the three capacitances that characterize power MOSFETs.
50V
OSCILLOSCOPE
+
-
100
CP
C =
u
C C
C -C
k
k
m
m
HIGH
+
-
10 M
S
G
LOW
CB
2000 pF
CK
1.0
μ
F
HIGH
+
-
10 M
S
G
LOW
CB
2000 pF
CK
1.0
μ
F
D
Figure 16.
Test circuit for transconductance
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