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參數資料
| 型號： | AN-24 |
| 廠商： | Electronic Theatre Controls, Inc. |
| 英文描述： | A Simplified Test Set for Op Amp Characterization |
| 中文描述： | 一種簡化的測試設置運算放大器表征 |
| 文件頁數： | 4/10頁 |
| 文件大小： | 412K |
| 代理商： | AN-24 |
NOTE: All resistor valves
in ohms.
All resistors
(/4
W, 5%
unless specified
otherwise.
TL/H/7190–6
FIGURE 6. Power Supply and Function Generator
DETAILED CIRCUIT DESCRIPTION
POWER SUPPLIES
As shown inFigure 6, which is a complete schematic of the
power supply and function generator, two power supplies
are provided in the test set. One supply provides a fixed
g
20V to power the circuitry in the test set; the other pro-
vides
g
5V to
g
20V to power the circuit under test.
The test set power supply regulator accepts
a
28V from the
positive rectifier and filter and provides
a
20V through the
LM100 positive regulator. Amplifier A
1
is powered from the
negative rectifier and filter and operates as a unity gain in-
verter whose input is
a
20V from the positive regulator, and
whose output is
b
20V.
The test circuit power supply is referenced to the
a
20V
output of the positive regulator through the variable divider
comprising R
7
, R
8
, R
9
, R
10
, and R
26
. The output of this
divider is
a
10V to
a
2.5V according to the position of S
2a
and is fed to the non-inverting, gain-of-two amplifier, A
2
. A
2
is powered from
a
28V and provides
a
20V to
a
5V at its
output. A
3
is a unity gain inverter whose input is the output
of A
2
and which is powered from
b
28V. The complementa-
ry outputs of amplifiers A
2
and A
3
provide dc power to the
circuit under test.
LM101 amplifiers are used as A
2
and A
3
to allow operation
from one ground referenced voltage each and to provide
protective current limiting for the device under test.
FUNCTION GENERATOR
The function generator provides three outputs, a
g
19V
square wave, a
b
19V to
a
19V pulse having a 1% duty
cycle, and a
g
5V triangular wave. The square wave is the
4
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