Making Average To Pulsed Approximations - Analog Devices ADPA1105-EVALZ User Manual

UG-1674

MAKING AVERAGE TO PULSED APPROXIMATIONS

Instruments that can be triggered are required to measure the RF
power, drain current, and power added efficiency (PAE) accurately
under pulsed operation. When such instrumentation is not
available, use averaging and approximations. The most
common approximations involve measuring the average values
and then adjusting those values to account for the duty cycle.
These approximations can result in errors because of limited
measurement bandwidths of instruments and/or the inclusion
of on and off transients and/or partial periods in the
measurement.
To ensure that partial periods do not contribute significant
errors to the measurements, perform averaging over a large
number of pulse periods. The results of such approximations
can vary with the instruments and settings used. Therefore,
experimentation can be necessary to achieve credible and
repeatable results. When it is not possible to make pulse
triggered measurements, the only pulse connection required is
the connection from the pulse generator to the J1 connector of
the pulser (see Figure 5).
Rev. 0 | Page 10 of 13
ADPA1105-EVALZ User Guide