AWG G3 PAD FOR PS3 Dokumentacja Pobierz pdf (Strona 143)

General Purpose Power Supply (GPDPS) 6 Device PowerSupply

System Reference, January 2001

143

Why are Performance Ranges Useful?

Performance Ranges guarantee the best trade-off between

measurement accuracy in iddq measurements and the

capability of the GPDPS to drive a specific current swing.

In other words, performance ranges permit the character-

istics of a GPDPS channel to be adjusted to suit a specific

DUT.

Current swings up to 8A can be regulated with a single

GPDPS channel operating in performance range 4.

The achievable measurement accuracy in performance

range 1 is ±100nA±0.1% (minimum number of samples:

500) as long as the blocking capacitor does not exceed 1µF.

In general, the higher the performance range, the higher

the load capacitance needed. For current measurements,

the load capacitance should be as low as possible to

reduce noise to a minimum and thus achieve highest

possible measurement accuracy.

How to set up the Correct Performance Range

To set up the correct performance range proceed as

follows:

1. Determine the maximum current step your DUT is

likely to require.

2. Determine the appropriate performance range (see

“Dynamic Load Performance Considerations” on

page 145).

3. Ensure that the load capacitance at the DUT pin is not

less than the load capacitance needed for stable opera-

tion (see Table 27 on page 142).

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AWG G3 PAD FOR PS3 Dokumentacja Strona 143