參數(shù)資料
型號(hào)： TS615
廠商： 意法半導(dǎo)體
英文描述： DUAL WIDE BAND OPERATIONAL AMPLIFIER WITH HIGH OUTPUT CURRENT
中文描述： 雙寬帶運(yùn)放的大輸出電流
文件頁(yè)數(shù)： 15/27頁(yè)
文件大?。?/td> 982K
代理商： TS615
TS615
15/27
INTERMODULATION DISTORTION PRODUCT
A non-ideal output of the amplifier can be de-
scribed by the following development :
due to a non-linearity in the input-output amplitude
transfer. In the case of the input is V
in
=Asin
ω
t, C
0
is the DC component, C
1
(V
in
) is the fundamental,
C
n
is the amplitude of the harmonics of the output
signal V
out
.
A one-frequency (one-tone) input signal contrib-
utes to a harmonic distortion. A two-tones input
signal contributes to a harmonic distortion and in-
termodulation product.
This intermodulation product or intermodulation
distortion study of a two-tones input signal is the
first step of the amplifier characterization of driving
capability in the case of a multi-tone signal.
In this case :
and :
In this expression, we recognize the second order
intermodulation IM2 by the frequencies (
ω
1
-
ω
2
)
and (
ω
1
+ω
2
) and the third order intermodulation
IM3 by the frequencies (2
ω
1
-
ω
2
), (2
ω
1
+ω
2
),
(
ω
1
+2
ω
2
) and (
ω
1
+2ω
2
).
The measurement of the intermodulation product
of the driver is achieved by using the driver as a
mixer by a summing amplifier configuration. By
this way, the non-linearity problem of an external
mixing device is avoided.
Figure 45 :
Non-inverting Summing Amplifier
The following graphs show the IM2 and the IM3 of
the amplifier in different configuration. The
two-tones input signal is achieved by the multi-
source generator Marconi 2026. Each tone has
the same amplitude. The measurement is
achieved by the spectrum analyzer HP3585A.
Vout
C0
C1Vin
C2V2in
…
CnVnin
+
+
+
=
Vin
A
ω
1t
sin
B
ω
2t
sin
+
=
Vout
C0
C1A
ω
1t
sin
B
ω
2t
sin
+
)
+
=
C2
+
A
ω
1t
sin
B
ω
2t
sin
+
(
)
2
…
CnA
ω
1t
sin
B
ω
2t
sin
+
)
n
+
Vout
C0
C2
A2
B2
+
2
+
=
C
+
1A
ω
1t
sin
B
ω
2t
sin
+
)
2
2
ω
1
cos
t
B2
2
ω
2t
cos
+
–
2
+
C2AB
ω
1
ω
2
–
(
)
t
ω
1
ω
2
–
(
)
cos
–
t
cos
(
)
3
4
￥
+
A3
ω
1t
sin
B3
ω
2t
2A2B
ω
1t
sin
2AB2
ω
2t
sin
+
+
sin
+
C3A3
3
ω
1t
sin
B3
3
ω
2t
sin
+
+
3C2
+
2
ω
1
ω
2
–
(
)
t
sin
1
2
–
2
ω
1
ω
+
2
(
)
t
sin
3C2
+
ω
1
2
ω
+
2
–
(
)
t
sin
1
2
–
ω
1
2
ω
+
2
(
)
t
sin
…
CnVin
)
n
+
Rg1
Rfb1
Vout diff.
11
10
13
+Vcc
100
50
49.9
49.9
_
-Vcc
√
2:1
+
Rfb2
Rg2
33
33
1k
1k
1k
1k
49.9
49.9
49.9
49.9
50
400
1:
√
2
50
400
1:
√
2
Vin1
Vin2
+
_
0315PB
0315PB
0315PB
1/2
TS615
1/2
TS615
North Hills
North Hills
North Hills
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