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AD829AR-REEL Datasheet(PDF) 9 Page - Analog Devices

No. de pieza AD829AR-REEL
Descripción Electrónicos  High-Speed, Low-Noise Video Op Amp
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Fabricante Electrónico  AD [Analog Devices]
Página de inicio  http://www.analog.com
Logo AD - Analog Devices

AD829AR-REEL Datasheet(HTML) 9 Page - Analog Devices

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AD829
REV. E
–9–
Table I. Component Selection for Shunt Compensation
Slew
–3 dB
Follower
Inverter
R1
R2
CL
CCOMP
Rate
Small Signal
Gain
Gain
pF
pF
V/ s
Bandwidth – MHz
1
Open
100
0
68
16
66
2
–1
1k
1k
5
25
38
71
5
–4
511
2.0k
1
7
90
76
10
–9
226
2.05k
0
3
130
65
20
–19
105
2k
0
0
230
55
25
–24
105
2.49
0
0
230
39
100
–99
20
2k
0
0
230
7.5
Table I gives recommended CCOMP and CLEAD values along with
the corresponding slew rates and bandwidth. The capacitor
values given were selected to provide a small signal frequency
response with less than 1 dB of peaking and less than 10% over-
shoot. For this table, supply voltages of
±15 volts should be
used. Figure 28 is a graphical extension of the table which
shows the slew rate/gain trade-off for lower closed-loop gains,
when using the shunt compensation scheme.
NOISE GAIN
100
1
1
100
10
10
10
100
1k
SLEW RATE
VS = 15V
CCOMP
Figure 28. Value of CCOMP & Slew Rate vs. Noise Gain
Current Feedback Compensation
Bipolar nondegenerated amplifiers which are single pole and
internally compensated have their bandwidths defined as:
fT
=
1
2
π r
e CCOMP
=
I
2
π
kT
q
CCOMP
where:
fT is the unity gain bandwidth of the amplifier
I is the collector current of the input transistor
CCOMP is the compensation capacitance
re is the inverse of the transconductance of the input transistors
kT/q is approximately equal to 26 mV @ 27
°C.
Since both fT and slew rate are functions of the same variables,
the dynamic behavior of an amplifier is limited. Since:
Slew Rate
=
2I
CCOMP
then:
Slew Rate
fT
= 4 π
kT
q
This shows that the slew rate will be only 0.314 V/
µs for every
MHz of bandwidth. The only way to increase slew rate is to
increase the fT and that is difficult, due to process limitations.
Unfortunately, an amplifier with a bandwidth of 10 MHz can
only slew at 3.1 V/
µs, which is barely enough to provide a full
power bandwidth of 50 kHz.
The AD829 is especially suited to a new form of compensation
which allows for the enhancement of both the full power band-
width and slew rate of the amplifier. The voltage gain from the
inverting input pin to the compensation pin is large; therefore, if
a capacitance is inserted between these pins, the amplifier’s
bandwidth becomes a function of its feedback resistor and this
capacitance. The slew rate of the amplifier is now a function of
its internal bias (2I) and this compensation capacitance.
Since the closed-loop bandwidth is a function of RF and CCOMP
(Figure 29), it is independent of the amplifier closed-loop gain,
as shown in Figure 31. To preserve stability, the time constant
of RF and CCOMP needs to provide a bandwidth of less than
65 MHz. For example, with CCOMP = 15 pF and RF = 1 k
Ω, the
small signal bandwidth of the AD829 is 10 MHz, while Figure
30 shows that the slew rate is in excess of 60 V/
µs. As can be
seen in Figure 31, the closed-loop bandwidth is constant for
gains of –1 to –4, a property of current feedback amplifiers.
FOR C1
OF CCOMP
CCOMP SHOULD NEVER EXCEED
15pF FOR THIS CONNECTION
0pF
15pF
<7pF
7pF
50
50
COAX
CABLE
–VS
0.1 F
0.1 F
AD829
RF
VOUT
R1
+VS
VIN
RL
1k
IN4148
CCOMP
C1*
*RECOMMENDED VALUE
Figure 29. Inverting Amplifier Connection Using Current
Feedback Compensation


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