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| 型號： | THS3202DRG4 |
| 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(shù)： | 17/36頁 |
| 文件大?。?/td> | 1118K |
| 代理商： | THS3202DRG4 |
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V
I
V
O
C1
+
-
R
G
R
F
R1
f
=
–3dB
1
2 R1C1
p
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
–3dB +
1
2pRC
+
C1
Rf
Rg
VO
VI
THS3202
V
O
V
I
+
R
f
Rg
S
)
1
R
f
C1
S
SLOS242F – SEPTEMBER 2002 – REVISED JANUARY 2010
www.ti.com
GENERAL CONFIGURATIONS
A common error for the first-time CFB user is creating a unity-gain buffer amplifier by shorting the output directly
to the inverting input. A CFB amplifier in this configuration oscillates and is not recommended. The THS3202, 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 very 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, as shown in Figure 83.
Figure 83. Single-Pole Low-Pass Filter
If a multiple-pole filter is required, the use of a Sallen-Key filter can work very 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 very accurate signals and help minimize
distortion. An example is shown in Figure 84.
Figure 84. 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 85, 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 86, uses positive
feedback to create the integration. Caution is advised because oscillations can occur due to the positive
feedback.
Figure 85. Inverting CFB Integrator
24
Copyright 2002–2010, Texas Instruments Incorporated
Product Folder Link(s): THS3202
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| THS3202EVM | 功能描述:放大器 IC 開發(fā)工具 THS3202 Eval Mod RoHS:否 制造商:International Rectifier 產(chǎn)品:Demonstration Boards 類型:Power Amplifiers 工具用于評估:IR4302 工作電源電壓:13 V to 23 V |
| THS3215EVM | 功能描述:EVALUATION MODULE 制造商:texas instruments 系列:* 零件狀態(tài):在售 標準包裝:1 |
| THS3215IRGVT | 功能描述:Differential Amplifier 1 Circuit 16-VQFN (4x4) 制造商:texas instruments 系列:- 包裝:剪切帶（CT） 零件狀態(tài):新產(chǎn)品 放大器類型:差分 電路數(shù):1 輸出類型:- 壓擺率:3000 V/μs 增益帶寬積:- -3db 帶寬:650MHz 電流 - 輸入偏置:4μA 電壓 - 輸入失調:12mV 電流 - 電源:35mA 電流 - 輸出/通道:95mA 電壓 - 電源，單/雙（±）:8 V ~ 15.8 V，±4 V ~ 7.9 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:16-VQFN 裸露焊盤 供應商器件封裝:16-VQFN（4x4） 標準包裝:1 |
| THS3217EVM | 功能描述:THS3217 1 - Single Channels per IC Differential Amplifier Evaluation Board 制造商:texas instruments 系列:- 零件狀態(tài):有效 每 IC 通道數(shù):1 - 單 放大器類型:差分 輸出類型:單端 壓擺率:5000 V/μs -3db 帶寬:800MHz 電流 - 輸出/通道:175mA 工作溫度:-40°C ~ 85°C 電流 - 電源（主 IC）:55mA 電壓 - 電源，單/雙（±）:8 V ~ 15.8 V，±4 V ~ 7.9 V 板類型:完全填充 所含物品:板 使用的 IC/零件:THS3217 標準包裝:1 |
| THS3217IRGVT | 功能描述:Differential Amplifier 1 Circuit 16-VQFN (4x4) 制造商:texas instruments 系列:- 包裝:剪切帶（CT） 零件狀態(tài):有效 放大器類型:差分 電路數(shù):1 輸出類型:- 壓擺率:5000 V/μs 增益帶寬積:- -3db 帶寬:800MHz 電流 - 輸入偏置:1μA 電壓 - 輸入失調:- 電流 - 電源:55mA 電流 - 輸出/通道:100mA 電壓 - 電源，單/雙（±）:±4 V ~ 7.9 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:16-VQFN 裸露焊盤 供應商器件封裝:16-VQFN（4x4） 標準包裝:1 |
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