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參數(shù)資料
| 型號(hào)： | AD5539 |
| 廠商： | Analog Devices, Inc. |
| 英文描述： | Ultrahigh Frequency Operational Amplifier(超高頻率運(yùn)算放大器) |
| 中文描述： | 超高頻率運(yùn)算放大器（超高頻率運(yùn)算放大器） |
| 文件頁(yè)數(shù)： | 8/16頁(yè) |
| 文件大?。?/td> | 499K |
| 代理商： | AD5539 |
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AD5539
REV. B
–8–
frequency. Both of these circuit techniques add a large amount
of leading phase shift at the crossover frequency, greatly aiding
stability.
T he lag network (R
LAG
, C
LAG
) increases the feedback attenua-
tion, i.e., the amplifier operates at a higher noise gain, above
some frequency, typically one-tenth of the crossover frequency.
As an example, to achieve a noise gain of 5 at frequencies above
44
MHz, for the circuit of Figure 15, would require a network
of:
R
1
4
R
1/
R
2
(
and . . .
1
2
π
R
LAG
R
LAG
=
)
±1
(3)
C
LAG
=
44
×
10
6
(
)
(4)
It is worth noting that an R
LAG
resistor may be used alone, to in-
crease the noise gain above 5 at all frequencies. However, this
approach has the disadvantage of also increasing the dc offset
and low frequency noise errors by an amount equal to the in-
crease in gain, in this case, by a factor of 5.
SOME PRACT ICAL CIRCUIT S
T he preceding general principles may now be applied to some
actual circuits.
A General Purpose Inverter Circuit
Figure 17 is a general purpose inverter circuit operating at a
gain of –2.
For this circuit, the total capacitance at the inverting input is ap-
proximately 3
pF; therefore, C
LEAD
from Equations 1 and 2
needs to be approximately 1.5 pF. As shown in Figure 17, a
small trimmer is used to optimize the frequency response of this
circuit. Without a lag compensation network, the noise gain of
the circuit is 3.0
and, as shown in Figure 18, the output ampli-
tude remains within
±
0.5 dB to 170 MHz and the –3 dB band-
width is 200 MHz.
Figure 17. A General Purpose Inverter Circuit
Figure 18. Response of the (Figure 17) Inverter Circuit
without a Lag Compensation Network
A lag network (Figure 15) can be added to improve the response
of this circuit even further as shown in Figures 19 and 20. In al-
most all cases, it is imperative to make capacitor C
LEAD
adjust-
able; in some cases, C
LAG
must also be variable. Otherwise,
component and circuit capacitance variations will dominate cir-
cuit performance.
Figure 19. Response of the (Figure 17) Inverter Circuit
with an R
LAG
Compensation Network Employed
Figure 20. Response of the (Figure 17) Inverter Circuit
with an R
LAG
and a C
LAG
Compensation Network
Employed
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| AD5539J | 制造商:AD 制造商全稱:Analog Devices 功能描述:Ultrahigh Frequency Operational Amplifier |
| AD5539JN | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Voltage-Feedback Operational Amplifier |
| AD5539JQ | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
| AD5539S | 制造商:AD 制造商全稱:Analog Devices 功能描述:Ultrahigh Frequency Operational Amplifier |
| AD5539SQ | 制造商:AD 制造商全稱:Analog Devices 功能描述:Ultrahigh Frequency Operational Amplifier |
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