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Can a positive tail pulse..amplitude no more than 5V and pulse duration maximum 50us (prf<= 1Mhz) be shaped to a gaussian near gaussian pulse using PSoC3?...Also like PSoC1 are the switched capacitor blocks available so that a simple CR-RC4 circuit can be realized?
Another thing...the block diagram of pulse oximeter on http://www.cypress.com/?rid=47829 shows an analog filter . I've not seen an analog filter in components of PSoC creator. How to find it?
Due to the central limit theorem, the Gaussian can be approximated by several runs of a very simple filter such as the moving average. The simple moving average corresponds to convolutionwith the constant B-spline ( a rectangular pulse ), and, for example, four iterations of a moving average yields a cubic B-spline as filter window which approximates the Gaussian quite well.
With pulse width of 50us, moving average filtering is doable, with 1mhz sampling ADC and DMA