Unified CORDIC-based chip to realise DFT/DHT/DCT/DST
Frequency analysis using the DFT, the DHT, the DCT or the DST is an obvious choice for the entire image and signal processing domain. A chip has been designed to obtain a unified architecture for the DFT/DHT/DCT/DST called DXT. For the low-power budget of many signal processing requirements, e.g. biomedical signal processing, a parallel and pipelined architecture is adopted for the unified design. The parallelism environment provides a real-time and low-power application of biomedical and other signal processing requirements, whereas the pipelined structure ensures high throughput of the design. The DXT architecture uses a CORDIC unit as the basic processing element. The UMC library (europractice) of 0.25 micron CMOS technology has been used to obtain a DXT chip of transform length ‘7’ for the synchronous design. The total dynamic power was found to be 204.89 mW, with an operating frequency of 160 MHz and an operating voltage of 2.5 V.