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參數(shù)資料
| 型號： | HFA1130883 |
| 廠商： | Intersil Corporation |
| 英文描述： | Output Clamping, 850MHz Current Feedback Amplifier |
| 中文描述： | 輸出鉗位，850MHz的電流反饋放大器 |
| 文件頁數(shù)： | 15/19頁 |
| 文件大?。?/td> | 865K |
| 代理商： | HFA1130883 |
DESIGN INFORMATION
(Continued)
The information contained in this section has been developed through characterization by Intersil Semiconductor and is for use as
application and design information only. No guarantee is implied.
218
HFA1130
Application Information
Optimum Feedback Resistor
The enclosed plots of inverting and non-inverting frequency
response illustrate the performance of the HFA1130 in
various gains. Although the bandwidth dependency on
closed loop gain isn’t as severe as that of a voltage feedback
amplifier, there can be an appreciable decrease in
bandwidth at higher gains. This decrease may be minimized
by taking advantage of the current feedback amplifier’s
unique relationship between bandwidth and R
F
. All current
feedback amplifiers require a feedback resistor, even for
unity gain applications, and 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 HFA1130 design is
optimized for a 510
R
F
at a gain of +1. Decreasing R
F
in a
unity gain application decreases stability, resulting in
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.
The table below lists recommended R
F
values for various
gains, and the expected bandwidth.
PC Board Layout
The frequency response of this amplifier depends greatly on
the amount of care taken in designing the PC board.
The
use of low inductance components such as chip resis-
tors 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
input and output of the device. Capacitance directly on the
output must be minimized, or isolated as discussed in the
next section.
Care must also be taken to minimize the capacitance to
ground seen by the amplifier’s inverting input (-IN). The
larger this capacitance, the worse the gain peaking, resulting
in pulse overshoot and possible instability. To this end, it is
GAIN
(A
CL
)
R
F
(
)
BANDWIDTH
(MHz)
-1
430
580
+1
510
850
+2
360
670
+5
150
520
+10
180
240
+19
270
125
recommended that the ground plane be removed under
traces connected to -IN, and connections to -IN should be
kept as short as possible.
An example of a good high frequency layout is the Evalua-
tion Board shown in Figure 2.
Driving Capacitive Loads
Capacitive loads, such as an A/D input, or an improperly
terminated transmission line will degrade the amplifier’s
phase margin resulting in frequency response peaking and
possible oscillations. In most cases, the oscillation can be
avoided by placing a resistor (R
S
) in series with the output
prior to the capacitance.
Figure 1 details starting points for the selection of this resis-
tor. The points on the curve indicate the R
S
and C
L
combina-
tions for the optimum bandwidth, stability, and settling time,
but experimental fine tuning is recommended. Picking a
point above or to the right of the curve yields an overdamped
response, while points below or left of the curve indicate
areas of underdamped performance.
R
S
and C
L
form a low pass network at the output, thus limit-
ing system bandwidth well below the amplifier bandwidth of
850MHz. By decreasing R
S
as C
L
increases (as illustrated in
the curves), the maximum bandwidth is obtained without
sacrificing stability. Even so, bandwidth does decrease as
you move to the right along the curve. For example, at
A
V
=+1, R
S
= 50
, C
L
=30pF, the overall bandwidth is lim-
ited to 300MHz, and bandwidth drops to 100MHz at A
V
= +1,
R
S
= 5
, C
L
=340pF.
FIGURE 1. RECOMMENDED SERIES OUTPUT RESISTOR vs
LOAD CAPACITANCE
Evaluation Board
The performance of the HFA1130 may be evaluated using
the HFA11XX Evaluation Board.
The layout and schematic of the board are shown in Figure
2. To order evaluation boards, please contact your local
sales office.
R
S
)
LOAD CAPACITANCE (pF)
50
45
40
35
30
25
20
15
10
5
00
40
80
120
160
200
240
280
320
360
400
A
V
= +1
A
V
= +2
Spec Number
511082-883
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| HFA1130EVAL | 制造商:INTERSIL 制造商全稱:Intersil Corporation 功能描述:850MHz, Output Limiting, Low Distortion Current Feedback Operational Amplifier |
| HFA1130IB | 功能描述:運(yùn)算放大器 - 運(yùn)放 800 MHz Output Limit RoHS:否 制造商:STMicroelectronics 通道數(shù)量:4 共模抑制比（最小值）:63 dB 輸入補(bǔ)償電壓:1 mV 輸入偏流（最大值）:10 pA 工作電源電壓:2.7 V to 5.5 V 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:QFN-16 轉(zhuǎn)換速度:0.89 V/us 關(guān)閉:No 輸出電流:55 mA 最大工作溫度:+ 125 C 封裝:Reel |
| HFA1130IB96 | 功能描述:IC BUFFER CFA 850MHZ 8-SOIC RoHS:否 類別:集成電路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 標(biāo)準(zhǔn)包裝:50 系列:LinCMOS™ 放大器類型:通用 電路數(shù):4 輸出類型:- 轉(zhuǎn)換速率:0.05 V/µs 增益帶寬積:110kHz -3db帶寬:- 電流 - 輸入偏壓:0.7pA 電壓 - 輸入偏移:210µV 電流 - 電源:57µA 電流 - 輸出 / 通道:30mA 電壓 - 電源，單路/雙路(±):3 V ~ 16 V，±1.5 V ~ 8 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:14-SOIC（0.154"，3.90mm 寬） 供應(yīng)商設(shè)備封裝:14-SOIC 包裝:管件 產(chǎn)品目錄頁面:865 (CN2011-ZH PDF) 其它名稱:296-1834296-1834-5 |
| HFA1130IBZ | 功能描述:運(yùn)算放大器 - 運(yùn)放 W/ANL OPAMP 850MHZ CFB CLMP IND RoHS:否 制造商:STMicroelectronics 通道數(shù)量:4 共模抑制比（最小值）:63 dB 輸入補(bǔ)償電壓:1 mV 輸入偏流（最大值）:10 pA 工作電源電壓:2.7 V to 5.5 V 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:QFN-16 轉(zhuǎn)換速度:0.89 V/us 關(guān)閉:No 輸出電流:55 mA 最大工作溫度:+ 125 C 封裝:Reel |
| HFA1130IBZ | 制造商:Intersil Corporation 功能描述:Operational Amplifier (Op-Amp) IC |
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