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參數資料
| 型號： | LB-52 |
| 廠商： | National Semiconductor Corporation |
| 英文描述： | A Low-Noise Precision |
| 中文描述： | 甲低噪聲精密 |
| 文件頁數： | 2/2頁 |
| 文件大?。?/td> | 82K |
| 代理商： | LB-52 |
L
A
time exhibits drift characteristics of the best low-drift amplifi-
ers. The amplifier has been used as a precision pre-amp
(gain
e
1000), and also as the output amplifier for a 20-bit
DAC, where low drift and low noise are both important.
for Q2 should be proportional to 1/
r
s
. The emitter current
of Q1A should be about ten times the base current of Q2A.
The base current of the output op amp should be no more
than 1/1000 of the emitter current of Q2. The values of R1
and R2 should be the same as R7.
To optimize the circuit for other r
s
levels, the emitter current
Various formulae for noise:
Current noise of a transistor, per
0
Hz, i
n
e
0
Voltage noise of a resistor, per
0
Hz, e
n
e
0
4 KTR
s
For a more complete analysis of low-noise amplifiers, see
AN-222, ‘‘Super Matched Bipolar Transistor Pair Sets New
Standards for Drift and Noise’’, Carl T. Nelson.
Voltage noise of a transistor, per
0
Hz, e
n
e
KT
0
2
ql
C
2ql
C
h
FE
*
Tracking TC
k
5 ppm/
§
C
**
Solid tantalum
***
Tracking TC
k
5 ppm/
§
C,
Beckman 694-3-R100K-D or similar
TL/H/8499–2
FIGURE 2. New Low-Noise Precision Operational Amplifier as Gain-of-1000 Pre-Amp
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NATIONAL’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT
DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT OF NATIONAL
SEMICONDUCTOR CORPORATION. As used herein:
1. Life support devices or systems are devices or
systems which, (a) are intended for surgical implant
into the body, or (b) support or sustain life, and whose
failure to perform, when properly used in accordance
with instructions for use provided in the labeling, can
be reasonably expected to result in a significant injury
to the user.
2. A critical component is any component of a life
support device or system whose failure to perform can
be reasonably expected to cause the failure of the life
support device or system, or to affect its safety or
effectiveness.
National Semiconductor
Corporation
1111 West Bardin Road
Arlington, TX 76017
Tel: 1(800) 272-9959
Fax: 1(800) 737-7018
National Semiconductor
Europe
Fax: (
a
49) 0-180-530 85 86
Email: cnjwge
@
tevm2.nsc.com
Deutsch Tel: (
a
49) 0-180-530 85 85
English
Tel: (
a
49) 0-180-532 78 32
Fran
3
ais Tel: (
a
49) 0-180-532 93 58
Italiano
Tel: (
a
49) 0-180-534 16 80
National Semiconductor
Hong Kong Ltd.
13th Floor, Straight Block,
Ocean Centre, 5 Canton Rd.
Tsimshatsui, Kowloon
Hong Kong
Tel: (852) 2737-1600
Fax: (852) 2736-9960
National Semiconductor
Japan Ltd.
Tel: 81-043-299-2309
Fax: 81-043-299-2408
National does not assume any responsibility for use of any circuitry described, no circuit patent licenses are implied and National reserves the right at any time without notice to change said circuitry and specifications.
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