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参数资料
| 型号： | HFA1113 |
| 厂商： | Intersil Corporation |
| 英文描述： | 850MHz, Low Distortion, Output Limiting, Programmable Gain, Buffer Amplifier(850MHz、低失真、输出限定可编程增益缓冲放大器) |
| 中文描述： | 是850MHz，低失真，输出限制，可编程增益，缓冲放大器（是850MHz，低失真，输出限定可编程增益缓冲放大器） |
| 文件页数： | 7/16页 |
| 文件大小： | 491K |
| 代理商： | HFA1113 |
7
FN1342.6
July 11, 2005
Clamp Accuracy
The clamped output voltage will not be exactly equal to the
voltage applied to V
H
or V
L
. Offset errors, mostly due to V
BE
mismatches, necessitate a clamp accuracy parameter which
is found in the device specifications. Clamp accuracy is a
function of the clamping conditions. Referring again to
Figure 4, it can be seen that one component of clamp
accuracy is the VBE mismatch between the Q
X6
transistors,
and the Q
X5
transistors. If the transistors always ran at the
same current level there would be no V
BE
mismatch, and no
contribution to the inaccuracy. The Q
X6
transistors are
biased at a constant current, but as described earlier, the
current through Q
X5
is equivalent to I
CLAMP
. V
BE
increases
as I
CLAMP
increases, causing the clamped output voltage to
increase as well. I
CLAMP
is a function of the overdrive level
(A
VCL
x V
IN
- V
OUT
CLAMPED
), so clamp accuracy degrades
as the overdrive increases. As an example, the specified
accuracy of
±
100mV (A
V
= -1, V
H
= 1V) for a 1.6X overdrive
degrades to
±
240mV for a 3X (200%) overdrive, as shown in
Figure 43.
Consideration must also be given to the fact that the clamp
voltages have an affect on amplifier linearity. The
“Nonlinearity Near Clamp Voltage” curve, Figure 48,
illustrates the impact of several clamp levels on linearity.
Clamp Range
Unlike some competitor devices, both V
H
and V
L
have
usable ranges that cross 0V. While V
H
must be more positive
than V
L
, both may be positive or negative, within the range
restrictions indicated in the specifications. For example, the
HFA1113 could be limited to ECL output levels by setting
V
H
= -0.8V and V
L
= -1.8V. V
H
and V
L
may be connected to
the same voltage (GND for instance) but the result won’t be
in a DC output voltage from an AC input signal. A
150mV - 200mV AC signal will still be present at the output.
Recovery from Overdrive
The output voltage remains at the clamp level as long as the
overdrive condition remains. When the input voltage drops
below the overdrive level (V
CLAMP
/A
VCL
) the amplifier will
return to linear operation. A time delay, known as the
Overdrive Recovery Time, is required for this resumption of
linear operation. The plots of “Unclamped Performance” and
“Clamped Performance” (Figures 41 and 42) highlight the
HFA1113’s subnanosecond recovery time. The difference
between the unclamped and clamped propagation delays is
the overdrive recovery time. The appropriate propagation
delays are 8.0ns for the unclamped pulse, and 8.8ns for the
clamped (2X overdrive) pulse yielding an overdrive recovery
time of 800ps. The measurement uses the 90% point of the
output transition to ensure that linear operation has
resumed. Note: The propagation delay illustrated is
dominated by the fixturing. The delta shown is accurate, but
the true HFA1113 propagation delay is 500ps.
Overdrive recovery time is also a function of the overdrive
level. Figure 47 details the overdrive recovery time for
various clamp and overdrive levels.
Typical Performance Curves
V
SUPPLY
=
±
5V, T
A
= 25
o
C, R
L
= 100
, Unless Otherwise Specified
FIGURE 5. SMALL SIGNAL PULSE RESPONSE
FIGURE 6. LARGE SIGNAL PULSE RESPONSE
A
V
= +2
200
150
100
50
0
-50
-100
-150
-200
O
TIME (5ns/DIV.)
A
V
= +2
2.0
1.5
1.0
0.5
0
-0.5
-1.0
-1.5
-2.0
O
TIME (5ns/DIV.)
HFA1113
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| HFA1113/883 | 制造商:INTERSIL 制造商全称:Intersil Corporation 功能描述:Output Limiting, Ultra High Speed Programmable Gain, Buffer Amplifier |
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| HFA1113IB | 功能描述:IC BUFFER 850MHZ 8-SOIC RoHS:否 类别:集成电路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 标准包装:50 系列:LinCMOS™ 放大器类型:通用 电路数:4 输出类型:- 转换速率:0.05 V/µs 增益带宽积:110kHz -3db带宽:- 电流 - 输入偏压:0.7pA 电压 - 输入偏移:210µV 电流 - 电源:57µA 电流 - 输出 / 通道:30mA 电压 - 电源，单路/双路(±):3 V ~ 16 V，±1.5 V ~ 8 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:14-SOIC（0.154"，3.90mm 宽） 供应商设备封装:14-SOIC 包装:管件 产品目录页面:865 (CN2011-ZH PDF) 其它名称:296-1834296-1834-5 |
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