A Switched Current Mirror based VLSI Architecture of 1-D DCT for Compressed ECG Signal Acquisition

The discrete cosine transform (DCT) has been identified as a potential basis for compressed sensing (CS) due to its spectral compaction property. In real-time biomedical applications, a discrete-time analog architecture of the DCT processor has been proposed as a low-energy alternative to digital realization. Some compression applications in image and video processing have reported analog 2-D DCT architectures in either charge mode or current mode. Here, a switched current mode circuit realized 1-D DCT in a biomedical CS system, outperforming charge mode with a simpler design and no capacitor issues. Using a current mode matrix vector multiplier (MVM), power consumption was reduced to $9.2 \mu \mathrm{W}$ with 41dB PSNR accuracy in SPICE simulations (PTM 65nm CMOS). MATLAB-SPICE co-simulation validated performance with ECG signals at compression ratios (CR) of ${0. 7 5}$ and ${0. 8 7 5}$. Keywords-discrete cosine transform, compressed sensing, switched current mirror, matrix vector multiplier, co-simulation