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参数资料
| 型号： | 5962-0722301VFA |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 运算放大器 |
| 英文描述： | OP-AMP, 5500 uV OFFSET-MAX, 3000 MHz BAND WIDTH, CDFP16 |
| 封装： | CERAMIC, CFP-16 |
| 文件页数： | 11/30页 |
| 文件大小： | 1043K |
| 代理商： | 5962-0722301VFA |
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www.ti.com
TEST CIRCUITS
Output Measured
Here With High
Impedance
Differential Probe
THS4513
CM
VIN
RF
RG
RIT
From
50
Source
VS+
VS
49.9
49.9
100
0.22
F
49.9
0.22
F
Open
Distortion
Frequency Response
THS 4513
CM
From
50
Source
VIN
0.22
F
49.9
VOUT
Open
To 50
Test
Equipment
RG
RIT
RG
RIT
RF
VS+
VS
RO
ROT
0.22
F
1:1
RF
SLOS539A – SEPTEMBER 2007 – REVISED OCTOBER 2007
of the network analyzer is 50
. RIT and RG are
chosen to impedance match to 50
, and to maintain
The THS4513 is characterized with the following test
the proper gain. To balance the amplifier, a 0.22
μF
circuits. For simplicity, power supply decoupling is not
capacitor and 49.9
resistor to ground are inserted
shown – see layout in the Application Information
across RIT on the alternate input.
section for recommendations. Depending on the test
conditions, component values are changed per the
The
output
is
probed
using
a
high-impedance
following tables, or as otherwise noted. The signal
differential probe across the 100
resistor. The gain
generators used are ac coupled 50
sources and a
is referred to the amplifier output by adding back the
0.22
μF capacitor and a 49.9 resistor to ground are
6-dB loss due to the voltage divider on the output.
inserted across RIT on the alternate input to balance
the circuit. A split power supply is used to ease the
interface to common test equipment, but the amplifier
can be operated single-supply as described in the
Application Information section with no impact on
performance.
Table 1. Gain Component Values
GAIN
RF
RG
RIT
6 dB
348
165
61.9
Figure 55. Frequency Response Test Circuit
10 dB
348
100
69.8
14 dB
348
56.2
88.7
20 dB
348
16.5
287
The circuit shown in Figure 56 is used to measure
Note: the gain setting includes 50
source
harmonic distortion and intermodulation distortion of
impedance. Components are chosen to achieve
the amplifier. A signal generator is used as the signal
gain and 50
input termination.
source and the output is measured with a spectrum
analyzer.
The
output
impedance
of
the
signal
Table 2. Load Component Values
generator is 50
. RIT and RG are chosen to
RL
RO
ROT
Atten
impedance-match to 50
, and to maintain the proper
100
25
open
6 dB
gain. To balance the amplifier, a 0.22
μF capacitor
and 49.9
resistor to ground are inserted across RIT
200
86.6
69.8
16.8 dB
on the alternate input.
499
237
56.2
25.5 dB
1k
487
52.3
31.8 dB
A low-pass filter is inserted in series with the input to
reduce harmonics generated at the signal source.
Note: the total load includes 50
termination by
The level of the fundamental is measured, then a
the test equipment. Components are chosen to
high-pass filter is inserted at the output to reduce the
achieve load and 50
line termination through a
fundamental so that it does not generate distortion in
1:1 transformer.
the input of the spectrum analyzer.
Due to the voltage divider on the output formed by
The transformer used in the output to convert the
the load component values, the amplifier's output is
signal
from
differential
to
single
ended
is
an
attenuated. The column Atten in Table 2 shows the
ADT1-1WT. It limits the frequency response of the
attenuation expected from the resistor divider. When
circuit so that measurements cannot be made below
using a transformer at the output as shown in
approximately 1 MHz.
Figure 56, the signal will see slightly more loss, and
these numbers will be approximate.
The circuit shown in Figure 55 is used to measure the
frequency response of the circuit.
A network analyzer is used as the signal source and
as the measurement device. The output impedance
Figure 56. Distortion Test Circuit
Copyright 2007, Texas Instruments Incorporated
19
Product Folder Link(s): THS4513-SP
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