SAW devices in wireless communication systems

Ash, D.L.

doi:10.1109/ultsym.1993.339693

Cited by 10 publications

(2 citation statements)

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“…An example of a SAW device used in a superregenerative amplifier was described by Ash [15]; this device is associated with the feedback architecture that is analyzed below. Positive feedback reappeared as a useful option in recursive or infinite-impulse response digital filters in which it provided much improved selectivity compared to the finite-impulse response counterparts [16].…”

Section: Generic Feedthrough and Feedbackmentioning

confidence: 99%

“…Some examples of this integration are novel signal generators [11]- [13] and devices that feature some on-board signal processing [14]. Another example is the development of SAW modules, which incorporate both SAW device and matching electronics to give standard impedances and throughput parameters [13], [15]. However, most of these devices merely combine features of the acoustic and electronic pathways without adding much extra value.…”

Section: Introductionmentioning

confidence: 99%

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New architectures for feedthrough SAW recursive devices

Kalashnikov

Challis

2005

IEEE Trans. Ultrason., Ferroelect., Freq. Contr.

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This paper presents an analysis of a new type of feedthrough recursive surface acoustic wave (SAW) device. The device combines a conventional SAW structure with positive feedback in a way that allows use of selective properties of the SAW structure, control of the central frequency and bandwidth, achieving significantly higher quality factors for given dimensions of the structure, and reduction of the sidelobe level. Several possible implementations are discussed from a simple one that uses external circuitry to the most advanced that includes digital supervisory control. Equations are presented that relate the central frequency, bandwidth, and sidelobe level to the parameters of the SAW structure and feedback loop. The simulation results were found to be in good agreement with experimental data. These data show the control of the central frequency within 1%, a 10-fold increase in the quality factor compared to the original SAW structure, and a reduction of the sidelobe level by 20 dB irrespective of the influence of second order effects and random manufacturing fluctuations.

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Section: Generic Feedthrough and Feedbackmentioning

confidence: 99%