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| 型號(hào)： | THS7002EVM |
| 廠商： | Texas Instruments, Inc. |
| 英文描述： | 70-MHz PROGRAMMABLE-GAIN AMPLIFIERS |
| 中文描述： | 70 - MHz的可編程增益放大器 |
| 文件頁數(shù)： | 18/32頁 |
| 文件大小： | 597K |
| 代理商： | THS7002EVM |
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THS7001, THS7002
70-MHz PROGRAMMABLE-GAIN AMPLIFIERS
SLOS214B – OCTOBER 1998 – REVISED AUGUST 1999
18
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
APPLICATION INFORMATION
noise calculations and noise figure (continued)
Because the dominant noise components are generally the source resistance and the internal amplifier noise
voltage, we can approximate noise figure as:
NF
10log
1
en
2
IN
RS
2
4 kTRS
Figure 54 shows the noise figure graph for the THS7001 and THS7002.
PREAMP NOISE FIGURE
vs
SOURCE RESISTANCE
14
12
10
8
6
4
10
100
1k
Source Resistance –
2
N
10k
16
f = 10 kHz
TA = 25 C
0
Figure 54. Noise Figure vs Source Resistance
optimizing frequency response for the preamplifiers
Internal frequency compensation of the THS7001 and THS7002 was selected to provide very wide bandwidth
performance and still maintain a very low noise floor. In order to meet these performance requirements, the
preamplifiers must have a minimum gain of 2 (–1). Because everything is referred to the noninverting terminal
of an operational amplifier, the noise gain in a G = –1 configuration is the same as a G = 2 configuration.
One of the keys of maintaining a smooth frequency response, and hence, a stable pulse response, is to pay
particular attention to the inverting terminal. Any stray capacitance at this node causes peaking in the frequency
response. There are two things that can be done to help minimize this effect. The first is to simply remove any
ground planes under the inverting terminal of the amplifier. This also includes the trace that connects to this
terminal. Additionally, the length of this trace should be minimized. The capacitance at this node causes a lag
in the voltage being fed back due to the charging and discharging of the stray capacitance. If this lag becomes
too long, the amplifier will not be able to correctly keep the noninverting terminal voltage at the same potential
as the inverting terminal’s voltage. Peaking and possibly oscillations can occur if this happens.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| THS7002IPWP | 功能描述:特殊用途放大器 70-MHz Programmable- Gain Dual RoHS:否 制造商:Texas Instruments 通道數(shù)量:Single 共模抑制比（最小值）: 輸入補(bǔ)償電壓: 工作電源電壓:3 V to 5.5 V 電源電流:5 mA 最大功率耗散: 最大工作溫度:+ 70 C 最小工作溫度:- 40 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:QFN-20 封裝:Reel |
| THS7002IPWPG4 | 功能描述:特殊用途放大器 70-MHz Hi-Spd Dual Prgrmbl-Gain Amp RoHS:否 制造商:Texas Instruments 通道數(shù)量:Single 共模抑制比（最小值）: 輸入補(bǔ)償電壓: 工作電源電壓:3 V to 5.5 V 電源電流:5 mA 最大功率耗散: 最大工作溫度:+ 70 C 最小工作溫度:- 40 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:QFN-20 封裝:Reel |
| THS7002IPWPR | 功能描述:運(yùn)算放大器 - 運(yùn)放 70-MHz Programmable- Gain Dual RoHS:否 制造商:STMicroelectronics 通道數(shù)量:4 共模抑制比（最小值）:63 dB 輸入補(bǔ)償電壓:1 mV 輸入偏流（最大值）:10 pA 工作電源電壓:2.7 V to 5.5 V 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:QFN-16 轉(zhuǎn)換速度:0.89 V/us 關(guān)閉:No 輸出電流:55 mA 最大工作溫度:+ 125 C 封裝:Reel |
| THS7002PWP | 制造商:TI 制造商全稱:Texas Instruments 功能描述:70-MHz PROGRAMMABLE-GAIN AMPLIFIERS |
| THS7102 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:ADSL (POTS) CENTRAL OFFICE LINE INTERFACE DRIVER/RECEIVER |
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