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I designed a FIR Low Pass Filter using MATLAB's fdatool, filter specifications are:
Fpass = 10K
Fstop = 12.5K
stopband attenuation = 200dB
but the designed filter doesn't show the 200dB attenuation ? The filter's specs and its response in fdatool is attached as images.
I want to store the timing instant at which the output is being stored, how to get this in Verilog-A and $abstime stores values as "0.00000001,0.00000001,0.00000001,0.00000002,0.00000002 and so on", so no difference in first three values, how to get better precision i.e. let say...
Would like to know about very basic concept regarding Decimation Process, Let my baseband signal is 1KHZ and it is sampled at very high sampling rate let say 650KHz now I want to downsample the signal to decrease sampling frequency to Nyquist criteria, so what should be the cut...
Perhaps something similar are available at:
Hope this will be helpful.
Delta Sigma ADC:
Modulator = 2nd Order
CIC Filter = 3rd Order
OSR = 256
CIC is hardware efficient Decimation Filter but its frequency response shows passband droop and wide transition band, so my question is due to these non-idealities of CIC filter, How much degradation in...
In my opinion, since you never obtain an impulse in frequency domain for a pure sinusoid, because of implicit windowing that is taking place, i.e., rectangular windowing because you consider sinusoid over limited time. So applying window (hann, hamming etc) to time domain signal...
Thanks for timely reply.
I am doing simulations in MATLAB and I want to plot the input Sine Wave and the Voltage equivalent output on the same plot and also want to calculate the SNR by calculating noise by "subtracting output from input".
I have got the output of Delta Sigma ADC after Decimation (FIR LPF and Downsampling), How to convert Delta Sigma ADC's output to its voltage equivalent ? Any suggestions/relevant material will be helpful.
Thanks in Advance.
The Delta Sigma Modulator has 1-bit quantizer (so 0s and 1s as output) so Do I need to take 0s and 1s as input to Decimation filter or I need to convert them to -1 and +1, got confused after some literature review, any suggestion will be highly appreciated.
Thanks in Advance.
I am working on Delta Sigma ADCs in MATLAB, to equalize the amplitude of input and output I have to multiply the output by a scaling factor, anyone who has experience of ADC (using or working on ADCs) share the reason for this scaling ? and Secondly the SNR after Delta Sigma...
I designed a FIR Low Pass Filter (Decimation Filter) for Delta Sigma modulator in MATLAB, After decimation filter the output is in the range of 0.5 to -0.5 (input to adc is sine wave, and calculated ENOB~11). I got confused because to my understanding if ENOB are let suppose 8...
I have attached the time domain and frequency domain response of Low Pass Filter. Can you elaborate a bit about "scale factor from the given filter transfer characteristic", any reading material related to this issue will be appreciated.
Thanks for your timely responses.
Just to simplify the unclear question,
After Decimation I have got the output actually it will be a binary output (ENOB ~11 bit) but in MATLAB it is decimal value, how to convert this output to equivalent voltage ? Input Voltage range is 0.25 to -0.25 V.
I am designing a Decimation Filter for Delta Sigma ADC, the input to ADC is 3 KHz 0.5V peak to peak (0.25V to -0.25V) Sine wave but the output of Decimation Filter (3367 taps FIR Low Pass Filter) is 3 KHz sine wave but the amplitude in the range of 0.507 to -0.507. How I should...