Future Work

There are kinds of biomedical signals. Therefore, it is necessary to have more channels to acquire more accurate and meaningful data. Extending the AFE IC is one of the solutions. For example, if the ICA algorithm become 64-channel analysis, it can use an 8-to-1 multiplexer in front of the 4-channel front-end, and use a 32-to-1 multiplexer after the 4-channel front-end as show in Figure 5.1. The 4-channel front-end circuit means four channels which are produced in 8-channel front-end for EEG application as show in Figure 2.1. In this way, the 64-channel front-end for ICA is designed as same as [43]. However, there is a same problem about time delay of multiplexers and front-end circuits. The architectures of them are decided by ICA processor.

Finally, the AFE IC and DSP IC will be composed together in one chip. In other words, it can use mix signal technology to produce a new chip in order to achieve the targets of lower power, lower noise, and area efficiency.

Figure 5.1 4-channel front-end extends to 64-channel front-end

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