參數資料
型號： THS3001CDG4
廠商： TEXAS INSTRUMENTS INC
元件分類： 音頻／視頻放大
英文描述： 1 CHANNEL, VIDEO AMPLIFIER, PDSO8
封裝： GREEN, PLASTIC, MS-012AA, SOIC-8
文件頁數： 18/38頁
文件大?。?/td> 875K
代理商： THS3001CDG4
VI
VO
C1
+
RG
RF
R1
f
*3 dB +
1
2pR1C1
V
O
V
I
+
1 )
R
F
R
G
1
1 ) sR1C1
VI
C2
R2
R1
C1
RF
RG
R1 = R2 = R
C1 = C2 = C
Q = Peaking Factor
(Butterworth Q = 0.707)
(
=
1
Q
2
)
RG
RF
_
+
f
*3 dB
+
1
2pRC
+
C1
RF
RG
VO
VI
THS3001
V
O
V
I
+
R
F
R
G
S
)
1
R
F
C1
S
www.ti.com................................................................................................................................................. SLOS217H – JULY 1998 – REVISED SEPTEMBER 2009
GENERAL CONFIGURATIONS
A common error for the first-time CFB user is the creation of a unity gain buffer amplifier by shorting the output
directly to the inverting input. A CFB amplifier in this configuration will oscillate and is not recommended. The
THS3001, like all CFB amplifiers, must have a feedback resistor for stable operation. Additionally, placing
capacitors directly from the output to the inverting input is not recommended. This is because, at high
frequencies, a capacitor has a low impedance. This results in an unstable amplifier and should not be considered
when using a current-feedback amplifier. Because of this, integrators and simple low-pass filters, which are
easily implemented on a VFB amplifier, have to be designed slightly differently. If filtering is required, simply
place an RC-filter at the noninverting terminal of the operational-amplifier (see Figure 56).
Figure 56. Single-Pole Low-Pass Filter
If a multiple-pole filter is required, the use of a Sallen-Key filter can work well with CFB amplifiers. This is
because the filtering elements are not in the negative feedback loop and stability is not compromised. Because of
their high slew rates and high bandwidths, CFB amplifiers can create accurate signals and help minimize
distortion. An example is shown in Figure 57.
Figure 57. 2-Pole Low-Pass Sallen-Key Filter
There are two simple ways to create an integrator with a CFB amplifier. The first, shown in Figure 58, adds a
resistor in series with the capacitor. This is acceptable because at high frequencies, the resistor is dominant and
the feedback impedance never drops below the resistor value. The second, shown in Figure 59, uses positive
feedback to create the integration. Caution is advised because oscillations can occur due to the positive
feedback.
Figure 58. Inverting CFB Integrator
Copyright 1998–2009, Texas Instruments Incorporated
25
Product Folder Link(s): THS3001
相關PDF資料
PDF描述
THS3001HVCDGNG4 1 CHANNEL, VIDEO AMPLIFIER, PDSO8
THS3001HVIDGNG4 1 CHANNEL, VIDEO AMPLIFIER, PDSO8
THS3001HVIDGNRG4 1 CHANNEL, VIDEO AMPLIFIER, PDSO8
THS3001IDG4 1 CHANNEL, VIDEO AMPLIFIER, PDSO8
THS3001IDRG4 1 CHANNEL, VIDEO AMPLIFIER, PDSO8
相關代理商/技術參數
參數描述
THS3001CDGN 功能描述:高速運算放大器 420-MHz Curr Feedback Amp 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
THS3001CDGNG4 功能描述:高速運算放大器 420-MHz Curr Feedback Amp 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
THS3001CDGNR 功能描述:高速運算放大器 420-MHz Curr Feedback Amp 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
THS3001CDGNRG4 功能描述:高速運算放大器 420-MHz Curr Feedback Amp 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
THS3001CDR 功能描述:高速運算放大器 420-MHz Curr Feedback Amp 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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