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| 型号： | THS7002CPWP |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 模拟信号调理 |
| 英文描述： | SPECIALTY ANALOG CIRCUIT, PDSO28 |
| 封装： | GREEN, PLASTIC, HTSSOP-28 |
| 文件页数： | 10/41页 |
| 文件大小： | 1203K |
| 代理商： | THS7002CPWP |
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THS7001, THS7002
70MHz PROGRAMMABLEGAIN AMPLIFIERS
SLOS214C OCTOBER 1998 REVISED MARCH 2007
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 )
e
n
2
) IN )
R
S
2
4kTR
S
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
Noise
Figure
dB
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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相关代理商/技术参数 |
参数描述 |
|---|---|
| THS7002CPWPG4 | 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 通道数量:Single 共模抑制比（最小值）: 输入补偿电压: 工作电源电压:3 V to 5.5 V 电源电流:5 mA 最大功率耗散: 最大工作温度:+ 70 C 最小工作温度:- 40 C 安装风格:SMD/SMT 封装 / 箱体:QFN-20 封装:Reel |
| THS7002CPWPR | 功能描述:特殊用途放大器 70-MHz Programmable- Gain Dual RoHS:否 制造商:Texas Instruments 通道数量:Single 共模抑制比（最小值）: 输入补偿电压: 工作电源电压:3 V to 5.5 V 电源电流:5 mA 最大功率耗散: 最大工作温度:+ 70 C 最小工作温度:- 40 C 安装风格:SMD/SMT 封装 / 箱体:QFN-20 封装:Reel |
| THS7002CPWPRG4 | 功能描述:特殊用途放大器 70-MHz Programmable- Gain Dual RoHS:否 制造商:Texas Instruments 通道数量:Single 共模抑制比（最小值）: 输入补偿电压: 工作电源电压:3 V to 5.5 V 电源电流:5 mA 最大功率耗散: 最大工作温度:+ 70 C 最小工作温度:- 40 C 安装风格:SMD/SMT 封装 / 箱体:QFN-20 封装:Reel |
| THS7002EVM | 功能描述:放大器 IC 开发工具 THS7002 Hi-Spd Amp Eval Mod RoHS:否 制造商:International Rectifier 产品:Demonstration Boards 类型:Power Amplifiers 工具用于评估:IR4302 工作电源电压:13 V to 23 V |
| THS7002IPWP | 功能描述:特殊用途放大器 70-MHz Programmable- Gain Dual RoHS:否 制造商:Texas Instruments 通道数量:Single 共模抑制比（最小值）: 输入补偿电压: 工作电源电压:3 V to 5.5 V 电源电流:5 mA 最大功率耗散: 最大工作温度:+ 70 C 最小工作温度:- 40 C 安装风格:SMD/SMT 封装 / 箱体:QFN-20 封装:Reel |
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