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參數(shù)資料
| 型號： | H1106I |
| 廠商： | Intersil Corporation |
| 英文描述： | 315MHz, Low Power, Video Operational Amplifier with Compensation Pin |
| 中文描述： | 315MHz的，低功耗，視頻運算放大器補償引腳 |
| 文件頁數(shù)： | 6/16頁 |
| 文件大小： | 616K |
| 代理商： | H1106I |
3-33
bandwidth significantly reduces system noise. Figure 3 illustrates
the noise performance of the HFA1106 with its bandwidth limited
to 40MHz by a 10pF C
COMP
. As expected the noise decreases
by approximately 37% (100% x (1-
√
40MHz/100MHz)) compared
with Figure 2. The decrease is an even more dramatic 48%
versus the HFA1105 noise level in Figure 1.
Additionally, compensating the HFA1106 allows the use of a
lower value R
F
for a given gain. The decreased bandwidth
due to C
COMP
keeps the amplifier stable by offsetting the
increased bandwidth from the lower R
F
. As noted previ-
ously, a lower value R
F
provides the double benefit of
reduced DC errors and lower total noise.
Less Lot-to-Lot Variability
External compensation provides another advantage by
allowing designers to set the op amp’s performance with a
precision external component. On-chip compensation
capacitors can vary by 10-20% over the process extremes.
A precise external capacitor dominates the on-chip compen-
sation for consistent lot-to-lot performance and more robust
designs. Compensating high frequency amplifiers to lower
bandwidths can simplify design tasks and ensure long term
manufacturability.
PC Board Layout
This amplifier’s frequency response depends greatly on the
care taken in designing the PC board.
The use of low
inductance components such as chip resistors and chip
capacitors is strongly recommended, while a solid
ground plane is a must!
Attention should be given to decoupling the power supplies.
A large value (10
μ
F) tantalum in parallel with a small value
(0.1
μ
F) chip capacitor works well in most cases.
Terminated microstrip signal lines are recommended at the
device’s input and output connections. Capacitance, para-
sitic or planned, connected to the output must be minimized,
compensated for by increasing C
COMP
, or isolated by a
series output resistor.
Care must also be taken to minimize the capacitance to
ground at the amplifier’s inverting input (-IN), as this capaci-
tance causes gain peaking, pulse overshoot, and if large
enough, instability. To reduce this capacitance, the designer
should remove the ground plane under traces connected to
-IN, and keep connections to -IN as short as possible.
An example of a good high frequency layout is the Evaluation
Board shown in Figure 4.
Evaluation Board
The performance of the HFA1106 may be evaluated using
the HFA11XX Evaluation Board.
Figure 4 details the evaluation board layout and schematic.
Connecting R
COMP
and C
COMP
in series from socket pin 8
to the GND plane compensates the op amp. Cutting the
trace from pin 8 to the V
H
connector removes the stray par-
allel capacitance, which would otherwise affect the evalua-
tion. Additionally, the 500
feedback and gain setting
resistors should be changed to the proper value for the gain
being evaluated.
To order evaluation boards (part number HFA11XXEVAL),
please contact your local sales office.
E
N
= 236
μ
V
RMS
FIGURE 3. HFA1106 NOISE PERFORMANCE,
COMPENSATED, A
V
= +2, R
F
= 100
, C
C
= 10
P
F
1
2
3
4
8
7
6
5
+5V
10
μ
F
0.1
μ
F
V
H
50
GND
GND
R
1
-5V
0.1
μ
F
10
μ
F
50
IN
OUT
V
L
510
510
V
H
+IN
V
L
V+
GND
1
V-
OUT
TOP LAYOUT
BOTTOM LAYOUT
FIGURE 4. EVALUATION BOARD SCHEMATIC AND LAYOUT
HFA1106
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| H1112NLT | 功能描述:變壓器音頻和信號 10/100BASE-TX 1:1 RoHS:否 制造商:Skyworks Solutions, Inc. 頻率范圍:810 MHz to 960 MHz 初級線圈阻抗: 次級線圈阻抗: 絕緣電壓:23 dB 工作溫度范圍:- 40 C to + 85 C 端接類型:SMD/SMT 尺寸:6 mm L x 4.9 mm W x 1.6 mm H 產(chǎn)品:Splitters and Combiners |
| H1112T | 功能描述:變壓器音頻和信號 10/100BASE-TX 1:1 RoHS:否 制造商:Skyworks Solutions, Inc. 頻率范圍:810 MHz to 960 MHz 初級線圈阻抗: 次級線圈阻抗: 絕緣電壓:23 dB 工作溫度范圍:- 40 C to + 85 C 端接類型:SMD/SMT 尺寸:6 mm L x 4.9 mm W x 1.6 mm H 產(chǎn)品:Splitters and Combiners |
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