Abstract
This invention presents a method and device for real-time analog signal processing using Surface Acoustic Wave (SAW) technology. The system performs three core functions without digital conversion: (1) Autocorrelation Function (ACF) for time-frequency transformation, (2) Matched Filtering for pattern recognition, and (3) Phase Detection of modulated signals.
A SAW chip with interdigital transducers (IDTs) on a piezoelectric substrate decomposes input signals into parallel frequency channels ("frequency bins"). Envelope detection of each channel’s output generates an analog spectrogram. Weighting these outputs with predefined coded patterns (via analog operational circuits) enables instantaneous cross-correlation, acting as a matched filter. For phase-sensitive detection, in-phase/quadrature (I/Q) decomposition supports complex-valued processing of modulation schemes (e.g., QPSK, OFDM).
Creative Commons License
This work is licensed under a Creative Commons Attribution 4.0 License.
Recommended Citation
Mohr, Christian A.; Rode, Mark; and Dannemann, Marco, "P250307E_USS0068_TWIP DefPub SAWs as ACF, Matched Filter, and Phase Detection", Technical Disclosure Commons, (July 28, 2025)
https://www.tdcommons.org/dpubs_series/8403