Spurious phase modulation by crystal filters
Abstract
A recent spurious phase modulation (PM) problem discovered during a satellite thermal vacuum test was traced to a supposedly passive component: a crystal filter. While a literature search showed that this phenomenon has been observed in the past, the effect does not seem to be widely known and is a possible problem in some current designs. The PM was noted in a passive four-pole lattice-type crystal bandpass filter at high drive levels over a narrow temperature range. The modulation sidebands were within the 3-dB bandwidth of the filter and 20 dB below the carrier.
- Publication:
-
1993 14th IEEE Aerospace Applications Conference
- Pub Date:
- 1993
- Bibcode:
- 1993aeap.conf...53M
- Keywords:
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- Bandpass Filters;
- Crystal Lattices;
- Phase Modulation;
- Satellite Communication;
- Bit Error Rate;
- Thermal Vacuum Tests;
- Communications and Radar