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参数资料
| 型号： | EL4093C |
| 元件分类： | 视频放大器 |
| 英文描述： | 300 MHz DC-Restored Video Amplifier(300MHz 直流恢复放大器) |
| 中文描述： | 300兆赫的DC -恢复视频放大器（300MHz的直流恢复放大器） |
| 文件页数： | 3/16页 |
| 文件大小： | 342K |
| 代理商： | EL4093C |
EL4093C
300 MHz DC-Restored Video Amplifier
Applications Information
Contd
Autozero Range
The autozero range is defined as the difference
between the input DC level and the reference
voltage to restore to The size of this range is a
function of the gain setting resistors used and the
SH output current swing For a gain of a2 the
optimum feedback resistor is 750
X and the avail-
able SH output current is g55 mA minimum
To determine the autozero range for this case we
refer to Figure 3 below
4093 – 39
Figure 3
Suppose that the input DC level is aVDC and
that the reference voltage is 0V We know that in
feedback the following two conditions will exist
on the CFA first its output will be equal to 0V
(due to autozero) and second its VINb voltage
is equal to the VINa voltage (ie VINbe
a
VDC) So we have a potential difference of
a
VDC across both RF and RG resulting in a cur-
rent IRF e IRG e VDC 750X that must flow
into each of them This current IAZ e (IRF a
IRG) must come from the SH output Since the
maximum that IAZ can be is 55 mA we can solve
for VDC using the following
IAZ e g55 mA e 2
VDC
750
X
J
and see that VDC e g2V This range can easily
accommodate most video signals
As another example consider the case where we
are restoring to a reference voltage of a075V
Using the same reasoning as above a current IRF
e
(VDC b 075V)RF must flow through RF
and a current IRG e VDC RG must go into RG
Again our boundary condition is that IRF a IRG
s
g
55 mA and we can solve for the allowable
VDC values using the following
g
55 mA e
VDC b 075V
750
X
a
VDC
750
X
Hence VDC must be between a24V to b17V
This example illustrates that when the reference
changes the autozero range also changes In gen-
eral
the user should determine the autozero
range for hisher application and ensure that the
input signal is within this range during the au-
tozero period
Autozero Loop Bandwidth
The gain-bandwidth product (GBWP) of the au-
tozero loop is determined by the size of the hold
capacitor the value of RF and the transconduct-
ances (gm’s) of the SH amplifier To begin the
SH amplifier is modeled as in Figure 4 below
First the input stage transconductance is repre-
sented by gm1 with the compensation capacitor
given by CHOLD This stage’s GBWP is thus
gm1(2
q
CHOLD) e 1(2q (350X)(22 nF))
e
207 kHz Next since the SH has a current
output its output stage can be modeled as a
transconductance gm2 in this case having a val-
ue of 1(500
X) The current from gm2 then flows
through the I to V converter made up of the CFA
and RF to produce a voltage gain Thus the
GBWP of the overall loop is given by
GBWP e
gm1
2
q
CHOLD
(gm2
RF)
11
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PDF描述 |
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| EL4094C | Video Gain Control/Fader(视频增益控制器/信号渐弱器) |
| EL4094 | Video Gain Control/Fader |
| EL4094CN | Video Gain Control/Fader |
| EL4094CS | Video Gain Control/Fader |
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相关代理商/技术参数 |
参数描述 |
|---|---|
| EL4093CN | 制造商:INTERSIL 制造商全称:Intersil Corporation 功能描述:300MHz DC-Restored Video Amplifier |
| EL4093CS | 功能描述:IC VIDEO AMP 300MHZ 16-SOIC RoHS:否 类别:集成电路 (IC) >> 线性 - 放大器 - 视频放大器和频缓冲器 系列:- 标准包装:1,000 系列:- 应用:驱动器 输出类型:差分 电路数:3 -3db带宽:350MHz 转换速率:1000 V/µs 电流 - 电源:14.5mA 电流 - 输出 / 通道:60mA 电压 - 电源，单路/双路(±):5 V ~ 12 V，±2.5 V ~ 6 V 安装类型:表面贴装 封装/外壳:20-VFQFN 裸露焊盘 供应商设备封装:20-QFN 裸露焊盘（4x4） 包装:带卷 (TR) |
| EL4093CS-T13 | 功能描述:IC VIDEO AMP 300MHZ 16-SOIC RoHS:否 类别:集成电路 (IC) >> 线性 - 放大器 - 视频放大器和频缓冲器 系列:- 标准包装:1,000 系列:- 应用:驱动器 输出类型:差分 电路数:3 -3db带宽:350MHz 转换速率:1000 V/µs 电流 - 电源:14.5mA 电流 - 输出 / 通道:60mA 电压 - 电源，单路/双路(±):5 V ~ 12 V，±2.5 V ~ 6 V 安装类型:表面贴装 封装/外壳:20-VFQFN 裸露焊盘 供应商设备封装:20-QFN 裸露焊盘（4x4） 包装:带卷 (TR) |
| EL4093CS-T7 | 功能描述:IC VIDEO AMP 300MHZ 16-SOIC RoHS:否 类别:集成电路 (IC) >> 线性 - 放大器 - 视频放大器和频缓冲器 系列:- 标准包装:1,000 系列:- 应用:驱动器 输出类型:差分 电路数:3 -3db带宽:350MHz 转换速率:1000 V/µs 电流 - 电源:14.5mA 电流 - 输出 / 通道:60mA 电压 - 电源，单路/双路(±):5 V ~ 12 V，±2.5 V ~ 6 V 安装类型:表面贴装 封装/外壳:20-VFQFN 裸露焊盘 供应商设备封装:20-QFN 裸露焊盘（4x4） 包装:带卷 (TR) |
| EL4093CSZ | 功能描述:IC VIDEO AMP 300MHZ 16-SOIC RoHS:是 类别:集成电路 (IC) >> 线性 - 放大器 - 视频放大器和频缓冲器 系列:- 标准包装:1,000 系列:- 应用:驱动器 输出类型:差分 电路数:3 -3db带宽:350MHz 转换速率:1000 V/µs 电流 - 电源:14.5mA 电流 - 输出 / 通道:60mA 电压 - 电源，单路/双路(±):5 V ~ 12 V，±2.5 V ~ 6 V 安装类型:表面贴装 封装/外壳:20-VFQFN 裸露焊盘 供应商设备封装:20-QFN 裸露焊盘（4x4） 包装:带卷 (TR) |
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