參數(shù)資料
型號(hào)： TSH310ID
廠商： 意法半導(dǎo)體
英文描述： 400A High-Speed Operational Amplifier
中文描述： 四樓高速運(yùn)算放大器
文件頁數(shù)： 14/19頁
文件大小： 449K
代理商： TSH310ID
TSH310
Intermodulation Distortion Product
14/19
6 Intermodulation Distortion Product
The non-ideal output of the amplifier can be described by the following series:
due to non-linearity in the input-output amplitude transfer, where the input is V
in
=Asin
ω
t, C
0
is the DC
component, C
1
(V
in
) is the fundamental and C
n
is the amplitude of the harmonics of the output signal V
out
.
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 form a single
sine wave: second-order intermodulation terms IM2 by the frequencies (
ω
1
-
ω
2
) and (
ω
1
+ω
2
) with an
amplitude of C2A
2
and third-order intermodulation terms IM3 by the frequencies (2
ω
1
-
ω
2
), (2
ω
1
+ω
2
), (
ω
1
+2
ω
2
) and (
ω
1
+2ω
2
) with an amplitude of (3/4)C3A
3
.
The measurement of the intermodulation product of the driver is achieved by using the driver as a mixer
by a summing amplifier configuration (see
Figure 29
). In this way, the non-linearity problem of an external
mixing device is avoided.
Figure 29: Inverting summing amplifier (using evaluation board SO8_S_MULTI)
Vout
C0
C1Vin
C2V2in
…
CnVnin
+
+
+
=
Vin
A
ω
1t
sin
A
ω
2t
sin
+
=
Vout
C0
C1A
ω
1t
sin
A
ω
2t
sin
+
)
C2A
ω
1t
sin
A
ω
2t
sin
+
)
2
…
CnA
ω
1t
sin
A
ω
2t
sin
+
)
n
+
+
+
=
+
_
R
R
fb
1k
V
out
R
2
V
in
2
V
in
1
R
1
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TSH31IDT 功能描述:運(yùn)算放大器 - 運(yùn)放 Single MOS Input RoHS:否 制造商:STMicroelectronics 通道數(shù)量:4 共模抑制比（最小值）:63 dB 輸入補(bǔ)償電壓:1 mV 輸入偏流（最大值）:10 pA 工作電源電壓:2.7 V to 5.5 V 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:QFN-16 轉(zhuǎn)換速度:0.89 V/us 關(guān)閉:No 輸出電流:55 mA 最大工作溫度:+ 125 C 封裝:Reel
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