Fast-Fourier-transform processor using s.a.w. chirp filters

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Fast-Fourier-transform processor using s.a.w. chirp filters

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© The Institution of Electrical Engineers
Published

A fast-Fourier-transform (f.f.t.) processor based on the chirp transform algorithm implemented with surface-acoustic-wave (s.a.w.) chirp filters is reported. Using commercially available s.a.w. devices the processor computes a 128-point (nominal) f.f.t. in 25 μs, permitting real-time operation over 4 MHz bandwidth. Experimental results showing operation with sine and cosine inputs demonstrate processor performance in computing real and imaginary Fourier-transform components to an accuracy equivalent to 6 bits.

Inspec keywords: signal processing; fast Fourier transforms; passive filters; surface acoustic wave devices

Other keywords: chirp transform algorithm; surface acoustic wave chirp filters; SAW; fast Fourier transform processor; processor performance

Subjects: Other numerical methods; Passive filters and other passive networks; Ultrasonics, quantum acoustics, and physical effects of sound; Acoustic signal processing; Acoustic wave devices

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