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参数资料
| 型号： | 5962F0723201VXC |
| 厂商： | STMICROELECTRONICS |
| 元件分类： | 运算放大器 |
| 英文描述： | OP-AMP, 550 MHz BAND WIDTH, CDFP8 |
| 封装： | ROHS COMPLIANT, HERMETIC SEALED, CERAMIC, FP-8 |
| 文件页数： | 6/20页 |
| 文件大小： | 397K |
| 代理商： | 5962F0723201VXC |
Intermodulation distortion product
RHF350
14/20
Doc ID 15604 Rev 2
5
Intermodulation distortion product
The non-ideal output of the amplifier can be described by the following series of equations.
Where the input is Vin=Asinωt, C0 is the DC component, C1(Vin) is the fundamental and Cn is
the amplitude of the harmonics of the output signal Vout.
A one-frequency (one-tone) input signal contributes to harmonic distortion. A two-tone input
signal contributes to harmonic distortion and to the intermodulation product.
The study of the intermodulation and distortion for a two-tone input signal is the first step in
characterizing the driving capability of multi-tone input signals.
In this case:
then:
From this expression, we can extract the distortion terms, and the intermodulation terms
from a single sine wave.
●
Second-order intermodulation terms IM2 by the frequencies (
ω1-ω2) and (ω1+ω2) with an
amplitude of C2A2.
●
Third-order intermodulation terms IM3 by the frequencies (2
ω1-ω2), (2ω1+ω2), (ω1+2ω2)
and (
ω1+2ω2) with an amplitude of (3/4)C3A3.
The intermodulation product of the driver is measured by using the driver as a mixer in a
summing amplifier configuration (Figure 27). In this way, the non-linearity problem of an
external mixing device is avoided.
Figure 27.
Inverting summing amplifier
V
out
C
0
C
1Vin
C
2V
2
in
… C
+
nV
n
in
++
+
=
V
in
A
ω
1t
sin
A
ω
2t
sin
+
=
V
out
C
0
C
1 A
ω
1t
sin
A
ω
2t
sin
+
() C
2 A
ω
1t
sin
A
ω
2t
sin
+
()
2… C
n A
ω
1t
sin
A
ω
2t
sin
+
()
n
++
+
=
+
_
R
fb
100
V
out
R2
V
in2
V
in1
R1
+
_
R
fb
100
V
out
R2
V
in2
V
in1
R1
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