A Low Power 64-point Bit-Serial FFT Engine for Implantable Biomedical Applications

Implantable biomedical devices are typically battery operated. Therefore they normally have stringent constrains on power consumption and size. This paper presents a low power 64-point, 16-bit fixed-point Fast Fourier Transform(FFT) processor design. Bit-serial logic was used in the design to achieve low power while maintain sufficient performance for biomedical applications. The proposed FFT design was implemented in a commercial 0.18um CMOS process with a power supplier of 1.8V and running at 50MHz clock rate. The power consumption of 14mW with 0.55Mpoints/s signal throughput is achieved.