參數資料
型號： THS4275DGK
廠商： Texas Instruments, Inc.
英文描述： LOW NOISE, HIGH SLEW RATE, UNITY GAIN STABLE VOLTAGE FREEBACK AMPLIFIER
中文描述： 低噪聲，高擺率，單位增益穩(wěn)定電壓留言反饋放大器
文件頁數： 22/38頁
文件大?。?/td> 1055K
代理商： THS4275DGK
SLOS397E JULY 2002 REVISED JANUARY 2004
www.ti.com
22
249
_
+
49.9
100
100
14-Bit,
400 MSps
DAC5675
3.3 V
3.3 V
CF
1 nF
249
49.9
1 nF
1 nF
CF
249
249
_
+
THS4271
THS4271
RF(out)
IF
IF+
100
1 nF
Figure 81. Differential Mixer Drive Circuit Using
the DAC5675 and the THS4271
Active Filtering With the THS4271
High-frequency active filtering with the THS4271 is
achievable due to the amplifier’s high slew-rate, wide
bandwidth, and voltage feedback architecture. Several
options are available for high-pass, low-pass, bandpass,
and bandstop filters of varying orders. A simple two-pole
low pass filter is presented here as an example, with two
poles at 100 MHz.
_
+
THS4271
49.9
50
Source
249
6.8
pF
5 V
5 V
33 pF
VO
249
61.9
VI
Figure 82. A Two-Pole Active Filter With Two
Poles Between 90 MHz and 100 MHz
A Low-Noise Receiver With the THS4271
A combination of two THS4271 amplifiers can create a
high-speed, low-distortion, low-noise differential receiver
circuit as depicted in Figure 83. With both amplifiers
operating in the noninverting mode of operation, the circuit
presents a high load impedance to the source. The
designer has the option of controlling the impedance
through termination resistors if a matched termination
impedance is desired.
_
+
49.9
100
VO+
VI+
_
+
49.9
100
VO
499
249
249
100
VI
Figure 83. A High Input Impedance, Low
Noise, Differential Receiver
A modification on this circuit to include a difference
amplifier turns this circuit into a high-speed instrumenta-
tion amplifier, as shown in Figure 84.
_
+
THS4271
100
VO
VI+
_
+
Rg1
Rf1
100
VI
_
+
Rf2
49.9
Rf1
Rg2
Rg2
Rf2
49.9
THS4271
THS4271
Figure 84. A High-Speed Instrumentation
Amplifier
V
O
1
2
1
2R
f1
R
g1
V
i
–V
i–
R
f2
R
g2
THEORY AND GUIDELINES
Distortion Performance
The THS4271 provides excellent distortion performance
into a 150-
load. Relative to alternative solutions, it
provides exceptional performance into lighter loads, as
well as exceptional performance on a single 5-V supply.
Generally, until the fundamental signal reaches very high
frequency or power levels, the 2
nd
harmonic dominates the
total harmonic distortion with a negligible 3
rd
harmonic
component. Focusing then on the 2
nd
harmonic,
increasing the load impedance improves distortion
(1)
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相關代理商/技術參數
參數描述
THS4275DGKG4 功能描述:高速運算放大器 Super-Fast Ultra-Low Distortion Hi-Speed RoHS:否 制造商:Texas Instruments 通道數量:1 電壓增益 dB:116 dB 輸入補償電壓:0.5 mV 轉換速度: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 安裝風格:SMD/SMT 封裝 / 箱體:SOIC-8 封裝:Tube
THS4275DGKR 功能描述:高速運算放大器 Super-Fast Ultra-Low Distortion Hi-Speed RoHS:否 制造商:Texas Instruments 通道數量:1 電壓增益 dB:116 dB 輸入補償電壓:0.5 mV 轉換速度: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 安裝風格:SMD/SMT 封裝 / 箱體:SOIC-8 封裝:Tube
THS4275DGKRG4 功能描述:高速運算放大器 Super-Fast Ultra-Low Distortion Hi-Speed RoHS:否 制造商:Texas Instruments 通道數量:1 電壓增益 dB:116 dB 輸入補償電壓:0.5 mV 轉換速度: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 安裝風格:SMD/SMT 封裝 / 箱體:SOIC-8 封裝:Tube
THS4275DGN 功能描述:高速運算放大器 Super-Fast Ultra-Low Distortion Hi-Speed RoHS:否 制造商:Texas Instruments 通道數量:1 電壓增益 dB:116 dB 輸入補償電壓:0.5 mV 轉換速度: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 安裝風格:SMD/SMT 封裝 / 箱體:SOIC-8 封裝:Tube
THS4275DGNG4 功能描述:高速運算放大器 Super-Fast Ultra-Low Distortion Hi-Speed RoHS:否 制造商:Texas Instruments 通道數量:1 電壓增益 dB:116 dB 輸入補償電壓:0.5 mV 轉換速度: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 安裝風格:SMD/SMT 封裝 / 箱體:SOIC-8 封裝:Tube
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