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參數(shù)資料
| 型號(hào)： | A111F |
| 英文描述： | Amplifier. Other |
| 中文描述： | 放大器。其他 |
| 文件頁(yè)數(shù)： | 1/1頁(yè) |
| 文件大?。?/td> | 34K |
| 代理商： | A111F |
AMPTEK,
INC.
6 DE ANGELO DRIVE, BEDFORD, MA 01730-2204 USA
TEL: +1 (781) 275-2242 FAX: +1 (781) 275-3470 email: sales@amptek.com www.amptek.com
The A111F is a high density version of the Amptek A111 Charge Sensitive Preamplifier and
Discriminator. The A111F features a Single In-line Package (SIP).
A111F DIAGRAM
Please refer to the A111 specifications for further information.
1
n
P
t
p
n
2
n
P
e
s
a
C
&
d
n
u
o
G
4
&
3
s
n
P
t
u
A
d
h
s
e
h
T
4
n
P
r
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M
g
o
n
A
5
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C
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8
1
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4
+
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V
6
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O
A111F PIN CONFIGURATION
APPLICATION NOTE: A111F THRESHOLD ADJUSTMENT
A) Increasing the Threshold of the A111F:
Increasing the threshold of the A111F beyond the x10 provided by shorting out Pins 3 & 4 can be
achieved by an RC feedback as shown below.
Apart from unit to unit variation, the discrimination levels will be as follows:
1)
Shorting out Pins 3 and 4 will result in x10 increase of nominal threshold:
(5 x 10
4
electrons) x 10 = 5 x 10
5
electrons.
2)
Shorting out Pins 3 and 4 plus feedback:
R = 50 k
R = 20 k
R = 5 k
R = 2 k
Intermediate values can be obtained by adjusting the value of R.
C = 2.2 pF : x 17
C = 3.3 pF : x 23
C = 4.7 pF : x 40
C = 6.8 pF : x 88
B) Decreasing the Threshold of A111F:
Decreasing the threshold of the A111F beyond the nominal 5 x 10
4
electrons can be achieved by
adding a resistor from Pin 4 to ground. A 300 ohm resistor will approximately double the sensitivity
resulting in a threshold of 2.5 x 10
4
electrons.
1
C
R
4
3
Weight: 1.75 grams
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