analog waveform in modelsim

[dsp_forall]

modelsim analog

can any one help to view analog wave form in modelsim

suppose i want to view 200 Hz sine wave as input data ??

thanks

 

[han00oo]

modelsim analog simulation

if u were talking about modelsim in FPGA design simulation in no way u can do this ,the signal must be DIGITAL & depending on your design u can substitute the analog signal with releated digital signal ......

 

[dsp_forall]

modelsim analog curve

ok if i want to give equivalent digital signal of analog .....how i can get those digital signals..


thanks in advance

 

[han00oo]

wavweform bei modelsim

can u post more details about your design?

 

[dsp_forall]

how to see analog waveform using modelsim

suppose i want to make filter say fir with cut off frequencies 250 Hz and if i give input data sum of three frequencies say 200 Hz 500 Hz and 1000Hz

i can get the output of only one frequency that is 200 Hz.

that i want to see in modelsim

 

[han00oo]

how to see analog waveform in modelsim

ok plz correct me if i got u wrong
u made a digital filter , the input signal is digital having different frequencies & u wanna simulate a signal with varying frequencies on modelsim ?

 

[dsp_forall]

how see sine waveform using modelsim?

yes correct

 

[han00oo]

how see sine wave form using modelsim?

did u try to make the input signal as a clock(from modelsim) & change duty & period to the desired frequency

or ofcourse the sys clock must be the higher frequency then u can put additional block to force input cotrlled with clk divider to the desired frequency

 

[dsp_forall]

cant see output signals modelsim

see we can force a clock but square wave has infinite frequencies ....verification problem

 

[han00oo]

modelsim digital to analog

let me remind u ....the filter u made must be digital filter & hence u can't apply a compsite frequencies analog signal direct to the Digital filter without passing through ADC
note that digital filter is capable of filtering square waves

 

[dsp_forall]

modelsim wave design

ok i did it ......i know that digital filter input is in digital form (say 8 bit ) ...

what i did is sample a composite signals in matlab and got samples ..and convert it in binary (8 bit) and applied to filter input .Now i changet the format of waveform window in modelsim to analog and i can view the analog waveform ..
set pixel setting according to your choice to get smooth output..

have a nice time and enjoy