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參數(shù)資料
| 型號： | LM363 |
| 廠商： | National Semiconductor Corporation |
| 元件分類： | 運動控制電子 |
| 英文描述： | LM363 Precision Instrumentation Amplifier |
| 中文描述： | LM363精密儀表放大器 |
| 文件頁數(shù)： | 8/22頁 |
| 文件大?。?/td> | 452K |
| 代理商： | LM363 |
Simplified Schematic
(pin numbers in parentheses are for 8-pin package)
TL/H/5609–7
Theory of Operation
Referring to the Simplified Schematic, it can be seen that
the input voltage is applied across the bases of Q1 and Q2
and appears between their emitters. If R
E1-2
is the resist-
ance across these emitters, a differential current equal to
V
IN
/R
E1-2
flows from Q1’s emitter to Q2’s. The second
stage amplifier shown maintains Q1 and Q2 at equal collec-
tor currents by negative feedback to Q4. The emitter cur-
rents of Q3 and Q4 must therefore be unbalanced by an
amount equal to the current flow across R
E1-2
. Defining
R
E3-4
e
R5
a
R6, the differential voltage across the emitters
of Q4 to Q3 is equal to
V
IN
R
E 1-2
c
R
E3-4
.
This voltage divided by the attenuation factor
R4
R3
a
R4
R1
a
R2
is equal to the output-to-reference voltage. Hence, the over-
all gain is given by
G
e
V
OUT
V
IN
R4
R
E1-2
e
R2
e
R3
a
R4
c
R
E3-4
.
8
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