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参数资料
| 型号： | EL2082CS |
| 英文描述： | Current-Mode Multiplier |
| 中文描述： | 电流模式乘数 |
| 文件页数： | 5/16页 |
| 文件大小： | 357K |
| 代理商： | EL2082CS |
EL2082C
Current-Mode Multiplier
Applications Information
Contd
The circuit sums two inputs A and B such that the sum of their respective path gains is unity as
controlled by the potentiometer When the potentiometer’s wiper is fully down the slightly negative
voltage at the Vg of the B-side EL2082 cuts off the B signal to better than 70 dB attenuation at
358 MHz The A-side EL2082 is at unity gain so the only (error) signal presented to the op-amp’s -in-
put is the same (error) signal at the IIN of the A-side EL2082 The circuit thus outputs -AIN Since the
error signal required by the op-amp is very small even at video frequencies the current through the A-
side EL2082 is small and distortion is minimized
At 50% potentiometer setting equal error output signals flow from the EL2082’s since the op-amp still
requires little net -input current The EL2082’s essentially buck each other to establish an output and
50% gain occurs for both the A and B inputs The EL2082’s now contribute distortion but less than in
previous connections The op-amp sees a constant 1k feedback resistor regardless of potentiometer
setting so frequency response is stable for all gain settings
A single-input gain control is implemented by simply grounding BIN
Distortion can be improved by increasing the input resistors to lower signal currents This will lower
the overall gain accordingly but will not affect bandwidth which is dependent upon the feedback
resistors Reducing the signal input amplitude is an analagous tactic but the noise floor will effectively
rise
Another strategy to reduce distortion in video systems is to use DC restoration circuitry such as the
EL2090 ahead of the fader inputs to reduce the range of signals to be dealt with the b07V to a07V
possible range of inputs (due to capacitor coupling) would be changed to a stabilized b035V to a035V
span
The EL2020 EL2030 and EL2120 (at reduced bandwidth since it is compensated for 300
X feedback
resistors) all give the same video performance at NTSC operation
Variable Filters
This circuit is the familiar state-variable configuration similar to the bi-quad
Voltage Tuneable Bi-Quad Filter
F0 e
Vg
1V
1
2
q (R a 95X)C
J
2082 – 23
13
相关PDF资料 |
PDF描述 |
|---|---|
| EL2082 | Current-Mode Multiplier |
| EL2082C | Current-Mode Multiplier(电流模式乘法器) |
| EL2090CM | 100 MHz DC-Restored Video Amplifier |
| EL2090CN | 100 MHz DC-Restored Video Amplifier |
| EL2090C | 100 MHz DC-Restored Video Amplifier(100 MHz直流恢复型视频放大器) |
相关代理商/技术参数 |
参数描述 |
|---|---|
| EL2082J | 制造商:未知厂家 制造商全称:未知厂家 功能描述:Analog Multiplier |
| EL208-V | 功能描述:晶体管输出光电耦合器 Optocouplers RoHS:否 制造商:Vishay Semiconductors 输入类型:DC 最大集电极/发射极电压:70 V 最大集电极/发射极饱和电压:0.4 V 绝缘电压:5300 Vrms 电流传递比:100 % to 200 % 最大正向二极管电压:1.65 V 最大输入二极管电流:60 mA 最大集电极电流:100 mA 最大功率耗散:100 mW 最大工作温度:+ 110 C 最小工作温度:- 55 C 封装 / 箱体:DIP-4 封装:Bulk |
| EL2090 | 制造商:INTERSIL 制造商全称:Intersil Corporation 功能描述:100MHz DC-Restored Video Amplifier |
| EL2090C | 制造商:ELANTEC 制造商全称:ELANTEC 功能描述:100 MHz DC-Restored Video Amplifier |
| EL2090CM | 制造商:INTERSIL 制造商全称:Intersil Corporation 功能描述:100MHz DC-Restored Video Amplifier |
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