User's Manual Part 2

Processing Algorithms (draft)
RVP8 User’s Manual
April 2003
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Figure 5–2: Linearization of Saturated Signals Above +4dBm
corrected data are produced even when the RVP8 is alternating rapidly between different data
acquisition tasks, e.g., in a multi-function ASCOPE display. The additional pipeline delay will
not affect the high-speed performance when the RVP8 runs continuously in any single mode.
For amplitude correction to be applied, the instantaneous Burst/COHO signal level must exceed
the minimum valid burst power specified in the “Mb” setup section. If that level is not met, e.g.,
if the transmitter is turned off, then no correction is performed. Thus, the amplitude correction
feature conveniently “gets out of the way” when receiver-only tests are being performed.
The maximum correction that will ever be applied is 5dB. If the burst power in a given pulse
is more than 5dB above the mean, or less than 5dB below it, then the correction is clamped at
those limits. The power variation of a typical transmitter will easily be contained within this
interval (it is typically less than 0.3dB).
Instantaneous amplitude correction is a unique feature of the RVP8 digital receiver. Bench tests
with a signal generator reveal that an amplitude modulated waveform having 2.0dB of
pulse-to-pulse variation is reduced to less than 0.02dB RMS of (I,Q) variation after applying the
amplitude correction.