Making Average To Pulsed Approximations - Analog Devices EVAL-ADPA1106 User Manual

User Guide EVAL-ADPA1106

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 availa-
ble, use averaging and approximations. The most common approxi-
mations 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 J3 connector of the pulser (see Figure 5).
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