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| 型号： | THS7001IPWP |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 模拟信号调理 |
| 英文描述： | SPECIALTY ANALOG CIRCUIT, PDSO20 |
| 封装： | GREEN, PLASTIC, HTSSOP-20 |
| 文件页数： | 9/41页 |
| 文件大小： | 1203K |
| 代理商： | THS7001IPWP |
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THS7001, THS7002
70MHz PROGRAMMABLEGAIN AMPLIFIERS
SLOS214C OCTOBER 1998 REVISED MARCH 2007
17
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
APPLICATION INFORMATION
noise calculations and noise figure (continued)
RF1
A1
Vin
_
+
_
+
RG1
RF2
RG2
eni1
+
eno1
eni2
eno2
AV1= 1+
RF1
RG1
AV2= 1+
RF2
RG2
Figure 53. Simplified Composite Amplifier System
The noise due to amplifier 1 (A1) is the same as derived in equations 1 and 2. The composite system noise is
calculated as follows:
e
no2 +
e
ni2
2
) e
no1
2
A
V2
(3)
+
e
ni2
2
) e
ni1
A
V1
2
A
V2
In a typical system, amplifier 1 (A1) has a large gain (AV1). Because the noise is summed in the RMS method,
if the A1 output noise is more than 25% larger than the input noise of amplifier 2, the contribution of
amplifier 2’s input noise to the composite amplifier output noise can effectively be ignored. This reduces
equation 3 down to:
(4)
e
no2
e
ni1
A
V1
A
V2
Equation 4 shows that the very first amplifier (the preamplifier) is critical in any low-level signal system. This also
shows that practically any noisy amplifier can be used after the preamplifier with minimal SNR degradation.
For more information on noise analysis, please refer to the Noise Analysis section in Operational Amplifier
Circuits Applications Report (literature number SLVA043).
This brings up another noise measurement usually preferred in RF applications, the noise figure (NF). Noise
figure is a measure of noise degradation caused by the amplifier. The value of the source resistance must be
defined and is typically 50
in RF applications.
NF
+ 10log
e
2
ni
e
Rs
2
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相关代理商/技术参数 |
参数描述 |
|---|---|
| THS7001IPWPG4 | 功能描述:特殊用途放大器 70-MHz Hi-Spd Prog Gain Amplifier 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 |
| THS7001IPWPR | 功能描述:运算放大器 - 运放 70 MHz Hi Spd Prog Gain Amplifier RoHS:否 制造商:STMicroelectronics 通道数量:4 共模抑制比（最小值）:63 dB 输入补偿电压:1 mV 输入偏流（最大值）:10 pA 工作电源电压:2.7 V to 5.5 V 安装风格:SMD/SMT 封装 / 箱体:QFN-16 转换速度:0.89 V/us 关闭:No 输出电流:55 mA 最大工作温度:+ 125 C 封装:Reel |
| THS7001IPWPRG4 | 功能描述:运算放大器 - 运放 70 MHz Hi Spd Prog Gain Amplifier RoHS:否 制造商:STMicroelectronics 通道数量:4 共模抑制比（最小值）:63 dB 输入补偿电压:1 mV 输入偏流（最大值）:10 pA 工作电源电压:2.7 V to 5.5 V 安装风格:SMD/SMT 封装 / 箱体:QFN-16 转换速度:0.89 V/us 关闭:No 输出电流:55 mA 最大工作温度:+ 125 C 封装:Reel |
| THS7001PWP | 制造商:TI 制造商全称:Texas Instruments 功能描述:70-MHz PROGRAMMABLE-GAIN AMPLIFIERS |
| THS7002 | 制造商:TI 制造商全称:Texas Instruments 功能描述:70-MHz PROGRAMMABLE-GAIN AMPLIFIERS |
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