NuPower
TM
ULS-25-C01-S01 User Manual
Rev 1.0
7
3.6
POWER BACK-OFF MODE
The NuPower ULS-25-C01-S01 is designed to allow the user to reduce, or “back-off,” the output power in
support of linear waveform operation or to trade off output power in exchange for lower power
consumption. The amount of power back-off is assuming a 0 dBm drive level to the PA module.
Pins 7 & 9 on the CTRL/PWR interface connector are designated to allow such operation. Table 5 depicts
the pin configurations to achieve low, medium, and high back-off settings, where “N/C” is an indication
to leave the pin floating (i.e. not connected) since the pin is tied high internally, and where “GND” means
grounding the pin. Due to the broadband nature of the unit, the amount of attenuation is an
approximation for each respective setting as shown in Table 5, dependant on operational frequency and
other factors, including unit-to-unit power variation.
Table 5: Power Back-off Settings
Attenuation Settings
Bit 1
Bit 2
Full power / No attenuation
N/C
N/C
-6 dB (low)
GND
GND
-9 dB (med)
GND
N/C
-12 dB (high)
N/C
GND
