Title :
SAW quadrature binary modulation system applications
Author :
Vigil, A.J. ; Belkerdid, Madjid A. ; Malocha, Donald C.
Author_Institution :
Comlinear Corp., Urbana, IL, USA
Abstract :
A surface acoustic wave (SAW) modulation system has been built, using a combination of a digital message sequence, an impulse driver, and different SAW modulator filters, for experimental testing of a wide variety of quadrature binary modulation schemes. The RF testbed is described and characterized for system distortion, dynamic range, and spurious responses, and system optimization is discussed. Nine different SAW modulator filters having different time- and frequency-domain responses were designed and fabricated for use in the system. Several of the designs are representative of new modulation schemes which offer better spectral confinement; and time-domain envelope uniformity than MSK. The results obtained with the designed SAW quadrature binary modulation system are presented. Excellent agreement between time- and frequency-domain measurements and theoretical predictions using the SAW modulation system are shown.<>
Keywords :
frequency response; modulation; surface acoustic wave filters; test equipment; RF testbed; SAW modulation system; SAW modulator filters; digital message; dynamic range; frequency-domain responses; impulse driver; quadrature binary modulation system; spectral confinement; spurious responses; surface acoustic wave; system distortion; system optimization; time-domain envelope uniformity; Acoustic distortion; Acoustic testing; Acoustic waves; Digital filters; Digital modulation; Dynamic range; Impulse testing; Radio frequency; Surface acoustic waves; System testing;
Journal_Title :
Ultrasonics, Ferroelectrics, and Frequency Control, IEEE Transactions on
