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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)： | 16/19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.
219
HFA1130
FIGURE 2. EVALUATION BOARD SCHEMATIC AND LAYOUT
Clamp Operation
General
The HFA1130 features user programmable output clamps to
limit output voltage excursions. Clamping action is obtained
by applying voltages to the V
H
and V
L
terminals (DIP pins 8
and 5) of the amplifier. V
H
sets the upper output limit, while
V
L
sets the lower clamp level. If the amplifier tries to drive
the output above V
H
, or below V
L
, the clamp circuitry limits
the output voltage at V
H
or V
L
(
±
the clamp accuracy),
respectively. The low input bias currents of the clamp pins
allow them to be driven by simple resistive divider circuits, or
active elements such as amplifiers or DACs.
V
H
+IN
V
L
V+
GND
1
V-
OUT
TOP LAYOUT
BOTTOM LAYOUT
1
2
3
4
8
7
6
5
+5V
10
μ
F
0.1
μ
F
V
H
50
GND
GND
R1
-5V
0.1
μ
F
10
μ
F
50
IN
OUT
V
L
500
500
FIGURE 3. HFA1130 SIMPLIFIED VH CLAMP CIRCUITRY
Clamp Circuitry
Figure 3 shows a simplified schematic of the HFA1130 input
stage, and the high clamp (V
H
) circuitry. As with all current
feedback amplifiers, there is a unity gain buffer (QX1 - QX2)
between the positive and negative inputs. This buffer forces
-IN to track +IN, and sets up a slewing current of:
(V
-IN
- V
OUT
)/R
F
+ V
-IN
/ R
G
where R
G
is the gain setting resistor from -IN to GND. This
current is mirrored onto the high impedance node (Z) by
QX3 - QX4, where it is converted to a voltage and fed to the
output via another unity gain buffer. If no clamping is utilized,
the high impedance node may swing within the limits defined
by QP4 and QN4. Note that when the output reaches it’s qui-
escent value, the current flowing through -IN is reduced to
only that small current (-I
BIAS
) required to keep the output at
the final voltage.
Tracing the path from V
H
to Z illustrates the effect of the
clamp voltage on the high impedance node. V
H
decreases
by 2V
BE
(QN6 and QP6) to set up the base voltage on QP5.
QP5 begins to conduct whenever the high impedance node
reaches a voltage equal to QP5’s base voltage + 2V
BE
(QP5
and QN5). Thus, QP5 clamps node Z whenever Z reaches
V
H
. R1 provides a pull-up network to ensure functionality
with the clamp inputs floating. A similar description applies to
the symmetrical low clamp circuitry controlled by V
L
.
+1
+IN
V-
V+
QP1
QN1
V-
QN3
QP3
QP4
QN2
QP2
QN4QP5
QN5
Z
V+
-IN
V
OUT
I
CLAMP
R
F
(EXTERNAL)
QP6
QN6
V
H
R1
50K
(30K
FOR V
L
)
Spec Number
511082-883
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相關代理商/技術參數(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:運算放大器 - 運放 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 安裝風格:SMD/SMT 封裝 / 箱體:QFN-16 轉換速度:0.89 V/us 關閉: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:- 標準包裝:50 系列:LinCMOS™ 放大器類型:通用 電路數(shù):4 輸出類型:- 轉換速率: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） 供應商設備封裝: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:運算放大器 - 運放 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 安裝風格:SMD/SMT 封裝 / 箱體:QFN-16 轉換速度:0.89 V/us 關閉: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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