- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄371805 > HFA1102EVAL (Intersil Corporation) 600MHz Current Feedback Amplifier with Compensation Pin PDF資料下載
參數(shù)資料
| 型號： | HFA1102EVAL |
| 廠商： | Intersil Corporation |
| 英文描述： | 600MHz Current Feedback Amplifier with Compensation Pin |
| 中文描述： | 600MHz的電流反饋放大器補(bǔ)償引腳 |
| 文件頁數(shù)： | 4/4頁 |
| 文件大?。?/td> | 99K |
| 代理商： | HFA1102EVAL |
4
Application Information
Optimum Feedback Resistor (R
F
)
All current feedback amplifiers require a feedback resistor, even
for unity gain applications. The R
F
, in conjunction with the
internal compensation capacitor, sets the dominant pole of the
frequency response. Thus, the amplifier's bandwidth is
inversely proportional to R
F
. The HFA1102 design is optimized
for a 150
R
F
, at a gain of +1. Decreasing R
F
in a unity gain
application decreases stability, leading to excessive peaking
and overshoot. At higher gains the amplifier is more stable, so
R
F
can be decreased in a trade-off of stability for bandwidth.
Bandwidth Limiting
The bandwidth of the HFA1102 may be limited by connecting a
resistor(R
DAMP
)andcapacitorinseriesfrompin8toGND.The
series resister is required to damp the interaction between the
package parasitics and C
COMP
. Typical bandwidths for various
valuesofcompensationcapacitorareshowninthespecification
tables. Because the HFA1102 is already unity gain stable, the
main reason for limiting the bandwidth is to reduce the total
noise (broadband) of the circuit. Additionally, compensating the
HFA1102 allows the use of a lower value R
F
for a given gain.
The decreased bandwidthdue to C
COMP
offsets the bandwidth
increase from the lower R
F
, keeping the amplifier stable.
ReducingR
F
providesthedoublebenefitsofreducedDCerrors
(-I
B
×
R
F
) and reduced total noise (I
NI
×
R
F
and 4KTR
F
).
PC Board Layout
The frequency performance of this amplifier depends a great
deal on the amount of 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 chip
(0.1
μ
F) capacitor works well in most cases.
Terminated microstrip signal lines are recommended at the
inputandoutputofthedevice.Outputcapacitance,suchasthat
resulting from an improperly terminated transmission line will
degrade the frequency response of the amplifier and may
causeoscillations.Inmostcases,theoscillationcanbeavoided
by placing a resistor in series with the output.
Care must also be taken to minimize the capacitance to ground
seen by the amplifier’s inverting input. The larger this
capacitance, the worse the gain peaking, resulting in pulse
overshoot and possible instability. To this end, it is
recommended that the ground plane be removed under traces
connected to pin 2, and connections to pin 2 should be kept as
short as possible.
An example of a good high frequency layout is the Evaluation
Board shown.
Evaluation Board
The HFA1102 may be evaluated using the HFA11XX
Evaluation Board which is available from your local sales office
(part number HFA11XXEVAL). R
DAMP
and C
COMP
should be
connected in series from the socket pin to the GND plane. The
trace from pin 8 to the V
H
connector should be cut near the
socket to remove this parallel capacitance.The layout and
schematic of the board are shown below:
1
2
3
4
8
7
6
5
+5
10
μ
F
0.1
μ
F
V
H
50
GND
GND
500
500
-5V
0.1
μ
F
10
μ
F
50
IN
OUT
V
L
V
H
+IN
V
L
V+
GND
1
V-
OUT
TOP LAYOUT
FIGURE 1. EVALUATION BOARD SCHEMATIC AND LAYOUT
BOTTOM LAYOUT
600
60
6
0.6
0.06
G
)
0
45
90
135
180
P
0.01
0.1
0.3 0.6 1
FREQUENCY (MHz)
3
6 10
30 60100 300 600
A
V
= -1
C
C
= 0pF
C
C
= 1pF
C
C
= 3pF
C
C
= 7pF
C
C
= 0pF
C
C
= 1pF
C
C
= 3pF
C
C
= 7pF
PHASE
FIGURE 2. OPEN LOOP TRANSIMPEDANCE FOR VARIOUS
COMPENSATION CAPACITORS
HFA1102
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| HFA1102 | 600MHz Current Feedback Amplifier with Compensation Pin |
| HFA1102IB | 600MHz Current Feedback Amplifier with Compensation Pin |
| HFA1103IB | MB 41C 27#20 14#16 SKT PLUG RoHS Compliant: No |
| HFA1103 | 144 MACROCELL 5 VOLT ISP CPLD - NOT RECOMMENDED for NEW DESIGN |
| HFA1112EVAL | 850MHz, Low Distortion Programmable Gain Buffer Amplifier |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| HFA1102IB | 制造商:Rochester Electronics LLC 功能描述:850MHZOP AMP,8 PIN SOIC WITH COM PIN - Bulk |
| HFA1102IJ | 制造商:Harris Corporation 功能描述: |
| HFA1102IP | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
| HFA1103 | 制造商:INTERSIL 制造商全稱:Intersil Corporation 功能描述:200MHz, Video Op Amp with High Speed Sync Stripper |
| HFA1103_04 | 制造商:INTERSIL 制造商全稱:Intersil Corporation 功能描述:200MHz, Video Op Amp with High Speed Sync Stripper |
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。