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參數(shù)資料
| 型號： | LMH6504MA |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 模擬信號調(diào)理 |
| 英文描述： | Wideband, Low Power, Variable Gain Amplifier |
| 中文描述： | SPECIALTY ANALOG CIRCUIT, PDSO8 |
| 封裝： | SO-8 |
| 文件頁數(shù)： | 16/19頁 |
| 文件大小： | 759K |
| 代理商： | LMH6504MA |
Application Information
(Continued)
Signal frequencies must not reach the gain control port of the
LMH6504, or the output signal will be distorted (modulated
by itself). A fast settling AGC needs additional filtering be-
yond the integrator stage to block signal frequencies. This is
provided in
Figure 8
by a simple R-C filter (R
and C
);
better distortion performance can be achieved with a more
complex filter. These filters should be scaled with the input
signal frequency. Loops with slower response time (longer
integration time constants) may not need the R
10
– C
3
filter.
Checking the loop stability can be done by monitoring the V
G
voltage while applying a step change in input signal ampli-
tude. Changing the input signal amplitude can be easily
done with an arbitrary waveform generator.
AUTOMATIC GAIN CONTROL (AGC) #2
Figure 9
illustrates an automatic gain control circuit that
employs two LMH6504’s. In this circuit, U1 receives the input
signal and produces an output signal of constant amplitude.
U2 is configured to provide negative feedback. U2 generates
a rectified gain control signal that works against an adjust-
able bias level which may be set by the potentiometer and
R
. C
integrates the bias and negative feedback. The result-
ant gain control signal is applied to the U1 gain control input
V
. The bias adjustment allows the U1 output to be set at an
arbitrary level less than the maximum output specification of
the amplifier. Rectification is accomplished in U2 by driving
both the amplifier input and the gain control input with the U1
output signal. The voltage divider that is formed by R
1
and
R
2
, sets the rectifier gain.
20084359
FIGURE 8. Automatic Gain Control Circuit #1
L
www.national.com
16
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LMH6504MA/NOPB | 功能描述:特殊用途放大器 WB,Low Pwr,Variable 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 |
| LMH6504MAX | 功能描述:特殊用途放大器 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 |
| LMH6504MAX/E7000960 | 制造商:Texas Instruments 功能描述: |
| LMH6504MAX/NOPB | 功能描述:特殊用途放大器 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 |
| LMH6504MM | 功能描述:特殊用途放大器 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 |
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