R&S ZNB - Page 240

Concepts and Features
R&S
®
ZNB/ZNBT
240User Manual 1173.9163.02 ─ 55
Table 5-26: PAE measurement types
Measurement type /
Circuit diagram
Input parameters /
Description
Constant voltage source U
0
, R
The DC power supply provides a constant
voltage U
0
; a precision resistor R is connec-
ted in series to the DUT. A single measure-
ment of the DC voltage at the DUT U
m
pro-
vides the current and hence the DC input
power:
R
UU
UIUP
m
mmDC


0
Constant current source I
0
The DC power supply provides a constant
current I
0
; the DC voltage at the DUT U
m
is
measured. This provides the DC input power:
0
IUP
mDC

Voltage and current R
Voltage and current of the DC power supply
can be both unknown; a precision resistor R
is connected in series to the DUT. Two simul-
taneous DC voltage measurements provide
the DC input power:
R
UU
UIUP
mm
mmDC
12
11


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