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Spurious phase modulation by crystal filters

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3 Author(s)
Mallette, L.A. ; Hughes Aircraft Co., Los Angeles, CA, USA ; Ishikawa, K.Y. ; Varney, J.

A 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.<>

Published in:

Aerospace Applications Conference, 1993. Digest., 1993 IEEE

Date of Conference:

Jan. 31 1993-Feb. 5 1993