An ASIC Design of Multi-Electrode Digital Basket Catheter Systems with Reconfigurable Compressed Sampling

This paper presents an Application Specific Integrated Circuit (ASIC) design with reconfigurable compressed sampling (CS) for multi-electrode basket catheter systems that acquire intracardiac electrograms (IEGMs). This work adopts a reconfigurable CS (ReCS) encoder for near-electrode processing to enable sub-Nyquist sampling rate thus improve the system capacity. The ReCS encoder is designed to work with a reconfigurable compression cycle as well as a reconfigurable compression ratio, which makes it suitable for a wide range of different signals. This digital ASIC chip is placed at the distal end of the catheter close to electrodes, so that all signals have been digitalized and encoded before transmitting to an external receiver. Such architecture ensures serial data transmission, reducing number of traces and size of the catheter, as well as fabrication complexity. Evaluated area cost of total digital circuits is 0.046 mm2 and the power consumption is 49.1 $\mu \mathbf{W}$ with 4 MHz clock frequency in 65 nm process.