On this worksheet, cells are provided for entering the power supply voltages and currents for each device. Efficiencies are also assigned to each supply to permit the total system input power to be calculated.

Enter the supply voltage(s) in the cells at the top. Negative values do not affect the power calculation. The titles of the current and power columns will automatically change to reflect the values entered for the voltages.

Enter the efficiency of each supply to permit a total system power requirement to be calculated. Enter “100” for the efficiency otherwise.

Parameter	Description	Range	Tolerance	Units
Voltages	Power supply nominal output voltages	-500 to +500	-	V
Efficiency	Efficiency in converting from input voltage to output voltage	1 to 100	-	%
Device Parameters	Device current requirement	-10⁵ to +10⁵	-	mA

Table 7 DC Power Budget Input Parameters

Power calculation is straight forward as follows, where the power is the required output power from the associated supply:

The system supply input power requirement is calculated using the efficiency value for each voltage:

RF Cascade Workbook 2005 - RF Cafe Website

Figure 18 DC Power Budget

Chapter 1, 2, 3, 4, 5, 6, 7, 8,

9, 10, 11, 12, 13

Version 1.11

by Kirt Blattenberger

RF Cafe Website

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Chapter 10

Werbel Microwave power dividers, couplers - RF Cafe Website

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