參數(shù)資料
型號(hào)： THS4215DGNR
廠商： Texas Instruments, Inc.
英文描述： LOW-DISTORTION HIGH-SPEED VOLTAGE FEEDBACK AMPLIFIER
中文描述： 低失真高速電壓反饋型放大器
文件頁(yè)數(shù)： 24/41頁(yè)
文件大小： 1591K
代理商： THS4215DGNR
www.ti.com
IMD
3
= P
S
- P
O
P
S
P
O
P
O
f
c
= f
c
- f1
f
c
= f2 - f
c
P
S
f
c
- 3
f
f1 f
c
f2
f
c
+ 3
f
P
f - Frequency - MHz
OIP
3
P
O
IMD
3
2
where
(2)
P
O
10 log
V
2
P
0.001
2R
L
(3)
NOISE ANALYSIS
High slew rate, unity-gain stable, voltage-feedback
operational amplifiers usually achieve their slew rate
at the expense of a higher input noise voltage. The 7
nV/
√
Hz input voltage noise for the THS4211 and
THS4215 is, however, much lower than comparable
amplifiers. The input-referred voltage noise, and the
two input-referred current noise terms (4 pA/
√
Hz),
combine to give low output noise under a wide variety
of operating conditions. Figure 87 shows the amplifier
noise analysis model with all the noise terms in-
cluded. In this model, all noise terms are taken to be
noise voltage or current density terms in either
nV/
√
Hz or pA/
√
Hz.
IMD
3
OIP
3
IIP
3
3X
P
IN
(dBm)
1X
P
OUT
(dBm)
P
O
P
S
THS4211
THS4215
SLOS400D–SEPTEMBER 2002–REVISED NOVEMBER 2004
Intercept points are specifications long used as key
design criteria in the RF communications world as a
metric for the intermodulation distortion performance
of a device in the signal chain (e.g., amplifiers,
mixers, etc.). Use of the intercept point, rather than
strictly the intermodulation distortion, allows simpler
system-level calculations. Intercept points, like noise
figures, can be easily cascaded back and forth
through a signal chain to determine the overall
receiver chain's intermodulation distortion perform-
ance. The relationship between intermodulation dis-
tortion and intercept point is depicted in Figure 85
and Figure 86.
Due to the intercept point's ease of use in system
level calculations for receiver chains, it has become
the
specification
of
choice
tion-related design decisions. Traditionally, these sys-
tems use primarily class-A, single-ended RF ampli-
fiers as gain blocks. These RF amplifiers are typically
designed to operate in a 50-
environment. Giving
intercept points in dBm implies an associated im-
pedance (50
).
However, with an operational amplifier, the output
does not require termination as an RF amplifier
would. Because closed-loop amplifiers deliver signals
to their outputs regardless of the impedance present,
it is important to comprehend this when evaluating
the intercept point of an operational amplifier. The
THS4211
yields
optimum
when loaded with 150
to 1 k
, very similar to the
input impedance of an analog-to-digital converter
over its input frequency band.
As a result, terminating the input of the ADC to 50
can actually be detrimental to system performance.
for
guiding
distor-
distortion
performance
The discontinuity between open-loop, class-A ampli-
fiers and closed-loop, class-AB amplifiers becomes
apparent when comparing the intercept points of the
two types of devices. Equation 2 and Equation 3
define
an
intercept
point,
intermodulation distortion.
relative
to
the
Figure 85.
NOTE:
P
O
is the output power of a single tone, R
L
is
the load resistance, and V
P
is the peak voltage for a
single tone.
Figure 86.
24
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THS4215DR 功能描述:高速運(yùn)算放大器 Super-Fast Ultr-Lo- Distortion Hi-Speed RoHS:否 制造商:Texas Instruments 通道數(shù)量:1 電壓增益 dB:116 dB 輸入補(bǔ)償電壓:0.5 mV 轉(zhuǎn)換速度:55 V/us 工作電源電壓:36 V 電源電流:7.5 mA 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOIC-8 封裝:Tube
THS4215DRB 制造商:Rochester Electronics LLC 功能描述:- Bulk
THS4215DRBR 功能描述:高速運(yùn)算放大器 Super-Fast Ultr-Lo- Distortion Hi-Speed RoHS:否 制造商:Texas Instruments 通道數(shù)量:1 電壓增益 dB:116 dB 輸入補(bǔ)償電壓:0.5 mV 轉(zhuǎn)換速度:55 V/us 工作電源電壓:36 V 電源電流:7.5 mA 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOIC-8 封裝:Tube
THS4215DRBRG4 功能描述:高速運(yùn)算放大器 Super-Fast Ultr-Lo- Distortion Hi-Speed RoHS:否 制造商:Texas Instruments 通道數(shù)量:1 電壓增益 dB:116 dB 輸入補(bǔ)償電壓:0.5 mV 轉(zhuǎn)換速度:55 V/us 工作電源電壓:36 V 電源電流:7.5 mA 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOIC-8 封裝:Tube
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