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參數(shù)資料
| 型號： | THS4031DGN |
| 廠商： | Texas Instruments, Inc. |
| 英文描述： | 100-MHz LOW-NOISE HIGH-SPEED AMPLIFIERS |
| 中文描述： | 100 MHz的低噪聲高速放大器 |
| 文件頁數(shù)： | 24/38頁 |
| 文件大?。?/td> | 674K |
| 代理商： | THS4031DGN |
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THS4031, THS4032
100-MHz LOW-NOISE HIGH-SPEED AMPLIFIERS
SLOS224C – JULY 1999 – REVISED APRIL 2000
24
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
APPLICATION INFORMATION
optimizing frequency response (continued)
Table 1. Recommended Feedback Resistors
GAIN
Rf for VCC =
±
15 V and
±
5 V
300
360
3.3 k
(low stray-c PCB only)
2
–1
5
unity-gain concerns
THS403x was designed for extremely low noise with a minimum gain of 2 (–1). If the amplifier were to be
configured for unity gain, the output would tend to oscillate because the open-loop intersection on a Bode
diagram is at a –40 dB/decade slope instead of the –20 dB/decade slope required for stable operation. But, it
is sometimes desirable to have a low-noise unity gain buffer. There is a way to accomplish this feat with the
THS403x with some added complexity (see Figure 48). The lag compensation circuit shown in Figure 48
increases the noise gain of the amplifier without increasing the signal gain. Another way to look at this is that
the open-loop gain is effectively reduced by the 1 + R
F
/R
C
gain. This reduction causes the –40 dB/decade pole
to be shifted down into an open-loop gain of less than 1. The drawbacks of this circuit are the decreased
frequency response, the increased noise, and the increased output offset voltage (V
OO
). One way to eliminate
the V
OO
increase is to add a capacitor (C
C
) in series with R
C
, with the added requirement that the time constant
of C
C
and R
C
be set low enough for the Bode plot intersection to be at a –20 dB/decade slope. Typically, a 1
+ R
F
/R
C
gain of 2 to 3 yields a smooth frequency response for the THS403x. If C
C
is used, it is desirable to have
the 1/(2
π
R
C
C
C
) frequency 5 to 10 times lower than the amplifier’s natural bandwidth. One additional advantage
this circuit provides is that it makes driving capacitive loads much easier. A capacitive load causes the
–40 dB/decade intersection (because of the phase lag), to be above unity gain, the same as described
previously. In general, this R
C
and C
C
modification can be used in both an inverting and noninverting
configuration with the same results.
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| THS4031EVM | 100-MHz LOW-NOISE HIGH-SPEED AMPLIFIERS |
| THS4031FK | 100-MHz LOW-NOISE HIGH-SPEED AMPLIFIERS |
| THS4031MFK | 100-MHz LOW-NOISE HIGH-SPEED AMPLIFIERS |
| THS4032D | 100-MHz LOW-NOISE HIGH-SPEED AMPLIFIERS |
| THS4032DGN | 100-MHz LOW-NOISE HIGH-SPEED AMPLIFIERS |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| THS4031-EP | 制造商:TI 制造商全稱:Texas Instruments 功能描述:100-MHz LOW-NOISE HIGH-SPEED AMPLIFIERS |
| THS4031EVM | 功能描述:放大器 IC 開發(fā)工具 THS4031 Hi-Spd Amp 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 |
| THS4031FK | 制造商:TI 制造商全稱:Texas Instruments 功能描述:100-MHz LOW-NOISE HIGH-SPEED AMPLIFIERS |
| THS4031ID | 功能描述:高速運算放大器 100MHz Low Noise RoHS:否 制造商:Texas Instruments 通道數(shù)量:1 電壓增益 dB:116 dB 輸入補償電壓: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 |
| THS4031IDG4 | 功能描述:高速運算放大器 100-MHz Low Noise Volt-Feedback Amp RoHS:否 制造商:Texas Instruments 通道數(shù)量:1 電壓增益 dB:116 dB 輸入補償電壓: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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