Agilent Technologies 93000 SOC Series Training Manual page 127

7-3 Entering the Pin Configuration
Performance Range 1
Performance Range 2+
Agilent 93000 SOC Series User Training Part 1, October 2004
DPS Performance Ranges
In order to avoid oscillations of the power supply voltage caused by
current swings a bypass capacitor must be physically mounted on the
DUT board. The size of the capacitor depends on the expected current
swing range.
To adapt the DPS to the load characteristics of the DUT (current
swings), the DPS operates in four different performance ranges. The
table below shows the performance range typically assigned to a
certain load capacitor and associated current swing range:
DPS Performance Ranges (Voltage ripple ≤ 200mV)
Table 1
Performance Range Current Swing Bypass Capacitor (C)
1
1
2
2
3
3
4
4
Max. DC currentlimits:
Range 1:
Range 2, 3, 4: 8A
Read this table as follows:
The values of this table ensure that the DPS voltage ripple due to
current swings is ≤ 200mV.
In performance range 1 you need a bypass capacitor of about 100nF to
ensure that current swings ≤ 60 mA result in voltage ripples below
200mV. Current swings ≤ 100 mA require a bypass capacitor of about 4
µ
F.
In performance range 2 you need a bypass capacitor of about 4
ensure that current swings ≤ 300 mA result in voltage ripples below
200mV. Current swings ≤ 400 mA require a bypass capacitor of about
µ
20 F.
For example, if you expect a maximum current swing of about 250mA
the table above recommends a bypass capacitor of 4
range 2. Of course, you could also select performance range 3 with 20
µ
F. This would lead to a lower voltage ripple but on the other hand it
would increase the noise level.
≤ 60 mA
≤100 mA
≤ 300 mA
≤400 mA
≤ 1,0 A
≤ 1,5 A
≤ 3 A
≤ 8A
3A
Defining the Pins
100 nF
< 4 µF
4 µF
< 20 µF
20 µF
< 100 µF
100 µF
3000 µF
µ
F to
µ
F in performance
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