
1. Re: can pulse shaping be done in PSoC3?
user_14586677 Aug 2, 2013 6:45 AM (in response to user_94391782)"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?..."
See comments below on last item
"Also like PSoC1 are the switched capacitor blocks available so that a simple CRRC4 circuit can be realized?"
and take a look at this  www.cypress.com/
"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?"
PSOC 3 has a digital filter block and DAC that can be used for general purpose filter. However your sampling rate
requirement of at least 2 Mhz (1 Mhz Nyquist preferably 10 Mhz Nyquist) cannot be done because there is
no fast SAR A/D to keep up wirth sampling rate. OpAmps could be used for filtering, but their GBW of 3 Mhz
too low to implement a meaningful repeatable filter at 1 Mhz.
Regards, Dana,

2. Re: can pulse shaping be done in PSoC3?
ki.leung Aug 2, 2013 8:47 AM (in response to user_94391782)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 Bspline ( a rectangular pulse ), and, for example, four iterations of a moving average yields a cubic Bspline 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

3. Re: can pulse shaping be done in PSoC3?
bob.marlowe Aug 2, 2013 11:52 AM (in response to user_94391782)...and even the moving average can be done in hardware by using the UDBs programmed in Verilog and using a datapath could enforce the performance.
Bob

4. Re: can pulse shaping be done in PSoC3?
user_14586677 Aug 3, 2013 5:58 AM (in response to user_94391782)The max sampling rate of Delsig, occuring at its lowest resolution, 8 bits, is 384K SPS,
16 bits at 48KSPS. PSOC 3 is limited to DelSig.
en.wikipedia.org/wiki/Gaussian_filter
The DFB block in PSOC 3/5 can be used to implement a FIR based Gaussian
approximation. Some design help can be found at 
www.mathworks.com/help/signal/examples/firgaussianpulseshapingfilterdesign.html
Google "fir gaussian filter", there are a number of tools, some free, that can help
determining the coefficients for a FIR solution.
IIR approach  www.cwp.mines.edu/Meetings/Project06/cwp546.pdf
Regards, Dana.