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AD8058 Arkusz danych(PDF) 11 Page - Analog Devices

Numer części AD8058
Szczegółowy opis  Low Cost, High Performance Voltage Feedback, 325 MHz Amplifiers
Download  14 Pages
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Producent  AD [Analog Devices]
Strona internetowa  http://www.analog.com
Logo AD - Analog Devices

AD8058 Arkusz danych(HTML) 11 Page - Analog Devices

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AD8057/AD8058
–11–
REV. A
FREQUENCY – Hz
100
10
0.1
10
100M
100
1k
10k
100k
1
1M
10M
Figure 37. Current Noise vs. Frequency
FREQUENCY – MHz
100
10
0.1
0.1
1000
1
10
100
1
Figure 38. Output Impedance vs. Frequency
APPLICATIONS
Driving Capacitive Loads
When driving a capacitive load, most op amps will exhibit over-
shoot in their pulse response.
Figure 39 shows the relationship between the capacitive load that
results in 30% overshoot and closed loop gain of an AD8058. It can
be seen that, under the Gain = +2 condition, the device is stable
with capacitive loads of up to 69 pF.
In general, to minimize peaking or to ensure device stability for
larger values of capacitive loads, a small series resistor, RS, can
be added between the op amp output and the load capacitor, CL,
as shown in Figure 40.
For the setup shown in Figure 40, the relationship between RS
and CL was empirically derived and is shown in Table I.
CLOSED-LOOP GAIN
500
400
0
15
2
34
300
200
100
RS = 2.4
RS = 0
Figure 39. Capacitive Load Drive vs. Closed-Loop Gain
Table I. Recommended Value for Resistors RS, RF, RG vs.
Capacitive Load, CL, Which Results in 30% Overshoot
Gain
RF
RG
CL w/RS = 0
CL w/RS = 2.4
1
100
11
13
2
100
100
51
69
3
100
50
104
153
4
100
33.2
186
270
5
100
25
245
500
10
100
11
870
1580
–2.5V
RG
50k
VIN = 200mV p-p
AD8058
0.1 F
10 F
0.1 F
10 F
+2.5V
RF
CL
RS
VOUT
FET PROBE
Figure 40. Capacitive Load Drive Circuit
100mV
50ns/DIV
200mV
–100mV
–200mV
+ OVERSHOOT
29.0%
100mV
Figure 41. Typical Pulse Response with CL = 65 pF,
Gain = +2, and VS = ±2.5 V


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