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參數(shù)資料
| 型號： | AD825 |
| 廠商： | Analog Devices, Inc. |
| 英文描述： | Low Cost, General Purpose High Speed JFET Amplifier |
| 中文描述： | 低成本，通用高速結型場效應管放大器 |
| 文件頁數(shù)： | 9/12頁 |
| 文件大小： | 700K |
| 代理商： | AD825 |
AD825
–9–
REV. D
DRIVING CAPACITIVE LOADS
The internal compensation of the AD825, together with its high
output current drive, permits excellent large signal performance
while driving extremely high capacitive loads.
+V
S
TEKTRONIX
P6204 FET
PROBE
HP
PULSE
GENERATOR
50
C
L
V
OUT
0.01 F
10 F
–
V
S
V
IN
TEKTRONIX
7A24
PREAMP
0.01 F
10 F
AD825
R
IN
1k
1k
Figure 3a. Inverting Amplifier Driving a Capacitive Load
INPUT
OUTPUT
Figure 3b. Inverting Amplifier Pulse Response
While Driving a 400 pF Capacitive Load
THEORY OF OPERATION
The AD825 is a low cost, wide band, high performance FET
input operational amplifier. With its unique input stage design,
the AD825 assures no phase reversal even for inputs that exceed
the power supply voltages, and its output stage is designed to
drive heavy capacitive or resistive load with small changes rela-
tive to no load condition.
The AD825 (Figure 4) consists of common-drain common-base
FET input stage driving a cascoded, common base matched NPN
gain stage. The output buffer stage uses emitter followers in a
class AB amplifier that can deliver large current to the load
while maintaining low levels of distortion.
C
F
VNEG
VOUT
VPOS
POS
NEG
Figure 4. Simplified Schematic
The capacitor, C
F
, in the output stage, enables the AD825 to
drive heavy capacitive load. For light load, the gain of the out-
put buffer is close to unity, C
F
is bootstrapped and not much
happens. As the capacitive load is increased, the gain of the
output buffer is decreased and the bandwidth of the amplifier is
reduced through a portion of C
F
adding to the dominant pole.
As the capacitive load is further increased, the amplifier’s band-
width continues to drop, maintaining the stability of the AD825.
Input Consideration
The AD825 with its unique input stage assures no phase rever-
sal for signals as large or even larger than the supply voltages.
Also, layout considerations of the input transistors assure func-
tionality even with a large differential signal.
The need for a low noise input stage calls for a larger FET transis-
tor. One should consider the additional capacitance that is added
to assure stability. When filters are designed with the AD825,
one needs to consider the input capacitance (5 pF–6 pF) of the
AD825 as part of the passive network.
Grounding and Bypassing
The AD825 is a low input bias current FET amplifier. Its high
frequency response makes it useful in applications such as photo
diode interfaces, filters and audio circuits. When designing high
frequency circuits, some special precautions are in order. Circuits
must be built with short interconnects, and resistances should
have low inductive paths to ground. Power supply leads should
be bypassed to common as close as possible to the amplifier
pins. Ceramic capacitors of 0.1
μ
F are recommended.
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| AD825_04 | 制造商:AD 制造商全稱:Analog Devices 功能描述:Low Cost, General-Purpose High Speed JFET Amplifier |
| AD8250 | 制造商:AD 制造商全稱:Analog Devices 功能描述:Wide Supply Range, Micropower, |
| AD8250ARMZ | 功能描述:IC AMP INST ICMOS LDRIFT 10MSOP RoHS:是 類別:集成電路 (IC) >> Linear - Amplifiers - Instrumentation 系列:iCMOS® 標準包裝:2,500 系列:- 放大器類型:通用 電路數(shù):4 輸出類型:- 轉換速率:0.6 V/µs 增益帶寬積:1MHz -3db帶寬:- 電流 - 輸入偏壓:45nA 電壓 - 輸入偏移:2000µV 電流 - 電源:1.4mA 電流 - 輸出 / 通道:40mA 電壓 - 電源，單路/雙路(±):3 V ~ 32 V，±1.5 V ~ 16 V 工作溫度:0°C ~ 70°C 安裝類型:表面貼裝 封裝/外殼:14-TSSOP（0.173"，4.40mm 寬） 供應商設備封裝:14-TSSOP 包裝:帶卷 (TR) 其它名稱:LM324ADTBR2G-NDLM324ADTBR2GOSTR |
| AD8250ARMZ-R7 | 功能描述:IC AMP INST ICMOS LDRIFT 10MSOP RoHS:是 類別:集成電路 (IC) >> Linear - Amplifiers - Instrumentation 系列:iCMOS® 標準包裝:2,500 系列:- 放大器類型:通用 電路數(shù):4 輸出類型:- 轉換速率:0.6 V/µs 增益帶寬積:1MHz -3db帶寬:- 電流 - 輸入偏壓:45nA 電壓 - 輸入偏移:2000µV 電流 - 電源:1.4mA 電流 - 輸出 / 通道:40mA 電壓 - 電源，單路/雙路(±):3 V ~ 32 V，±1.5 V ~ 16 V 工作溫度:0°C ~ 70°C 安裝類型:表面貼裝 封裝/外殼:14-TSSOP（0.173"，4.40mm 寬） 供應商設備封裝:14-TSSOP 包裝:帶卷 (TR) 其它名稱:LM324ADTBR2G-NDLM324ADTBR2GOSTR |
| AD8250ARMZ-RL | 功能描述:IC AMP INST ICMOS LDRIFT 10MSOP RoHS:是 類別:集成電路 (IC) >> Linear - Amplifiers - Instrumentation 系列:iCMOS® 標準包裝:150 系列:- 放大器類型:音頻 電路數(shù):2 輸出類型:- 轉換速率:5 V/µs 增益帶寬積:12MHz -3db帶寬:- 電流 - 輸入偏壓:100nA 電壓 - 輸入偏移:500µV 電流 - 電源:6mA 電流 - 輸出 / 通道:50mA 電壓 - 電源，單路/雙路(±):4 V ~ 32 V，±2 V ~ 16 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:8-TSSOP（0.173"，4.40mm 寬） 供應商設備封裝:8-TSSOP 包裝:管件 |
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