Application of Surface Acoustic Wave Devices to Communication Receivers

摘要

This report relates to a study of acoustoelectric surface acoustic wave (SAW) devices for the detection of analog and digital communication signals. More specifically, a general SAW structure is shown to exhibit capabilities in demodulating amplitude, phase, and frequency modulated signals including those used in spread spectrum communication systems. The principle of operation for each device described is based upon acoustoelectric nonlinear interactions. The devices studied include the acoustoelectric phase-locked loop (PLL), SAW FM discriminator, differential phase shift-keyed (DPSK) demodulator, monolithic integrated SAW structures for the detection of spread spectrum communication signals, and an acoustoelectric voltage controlled oscillator (VCO). In addition, recognizing the importance of thin-film technology in fabricating monolithic integrated structures, we initiated a thin-film technology program. The capabilities and limitations of each of these devices were examined theoretically and experimentally. Theoretical models which provide physical insight into each demodulator's performance and design rules were advanced. Comparisons were made with known electronic structures. (Author)