AWG G3 PAD FOR PS3 Specifikace stáhnout pdf (Strana 146)

6 Device PowerSupply General Purpose Power Supply (GPDPS)

146 System Reference, January 2001

• load capacitance

Basically, each performance range requires a minimum

load capacitance to ensure stable operation. Further

increasing the load capacitance increases the low pass

filter effect and smooths the supply voltage from large

voltage ripples if load conditions change. Alternatively,

high load capacitances slow down dynamic perfor-

mance and introduce current noise into GPDPS

current measurements. This is especially undesirable

in low current measurements (standby or iddq

currents).

The following parameters are of importance from an appli-

cation point of view:

• maximum current swing

A high current swing can occur during operation, if the

DUT switches from the standard operational state to

the quiescent state or vice versa. This is typically the

current swing to be considered when selecting the

performance range.

• stability of supply voltage range

To guarantee an optimal supply for the DUT, the supply

voltage must be stable within a certain voltage range.

Minimum and maximum supply voltages are specified

in the DUT’s specification sheet. As a rule of thumb, to

guarantee supply voltage stability, the load capacitance

needs to be increased to decrease voltage ripple.

• measurement accuracy for low current measurements

(iddq, standby)

Any load capacitance introduces current noise in a

current measurement. The impact on the measurement

accuracy can be significant for very low current

measurements. In general, to take full advantage of the

high GPDPS current measurement accuracy, the load

capacitance should not be larger than 1µF.

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AWG G3 PAD FOR PS3 Specifikace Strana 146