[casper] Help with Casper Tutorial 3

Good evening I am trying to do the casper tutorial nr 3 on Ubuntu 14.04 LTS with ISE 14.7. When I say update model in Simulink or run System generator I get the following error: Failed to load library 'dspsigops' referenced by 'tut3/adc/Downsamplei0' Caused by: Unable to load block diagram

Re: [casper] ADC16x250-8 coax rev 2 noise

On 9/20/2016 3:55 PM, David MacMahon wrote: Hi Adam, A little bit of noise (a step or several rms) is a cure for many ADC ills, and is widely practiced under the term "dithering". It's usually nicest if the dithering waveform can be arranged to fall outside the signal band of interest (yet

Re: [casper] Help with Casper Tutorial 3

Hi Michael Thanks for your help. I will try to obtain a license for the DSP System Toolbox. Have a wonderful evening Heystek On Tue, Sep 20, 2016 at 10:28 PM, Michael D'Cruze < michael.dcr...@postgrad.manchester.ac.uk> wrote: > Hi Heystek, > > > > You need the DSP System Toolbox

Re: [casper] Help with Casper Tutorial 3

Hi Heystek, You can also just delete the simulation blocks inside the ADC for the time being. You don't need them to compile the design, only to be able to simulate the ADC analog inputs properly. Cheers Jack On Tue, 20 Sep 2016 at 13:32 Heystek Grobler wrote: > Hi

Re: [casper] Help with Casper Tutorial 3

Hi Heystek, You need the DSP System Toolbox unfortunately, in order to compile the ADC blocks. This is typically a paid-for toolbox, though my local IT Services were helpful and had a few spare server licences. BW Michael From: Heystek Grobler [mailto:heystekgrob...@gmail.com] Sent: 20

Re: [casper] ADC16x250-8 coax rev 2 noise

hi adam, the effect you are seeing is visible on many adc's - some digital noise gets into the analog input, and is often easy to see when there is no signal input, especially when the adc's DC offset happens to lie near the boundry of two ADC steps (then any noise will cause the ADC to toggle).

Re: [casper] Help with Casper Tutorial 3

Hi Michael This is the toolboxes that I have: MATLAB Version: 8.0.0.783 (R2012b) MATLAB License Number: 724504 Operating System: Linux 3.19.0-68-generic #76~14.04.1-Ubuntu SMP Fri Aug 12 11:46:25 UTC 2016 x86_64 Java Version: Java 1.6.0_17-b04 with Sun Microsystems Inc. Java HotSpot(TM) 64-Bit

[casper] Help with Casper Tutorial 3

Heystek, Do you have the DSP System Toolbox installed in Matlab? Michael

Re: [casper] ADC16x250-8 coax rev 2 noise

Hi, Adam, I haven't looked at the spectral content of a terminated input before so I don’t have any comparative results, but I think the spikes you are seeing are caused by mismatched gains and/or offsets of the ADC’s interleaved cores (I think there are a total of 8 cores, also called

Re: [casper] ADC16x250-8 coax rev 2 noise

And if you're wondering why it's only ever toggling between -1 and 0, it's because most ADCs are biased centred around -0.5, not 0. This is so that they're symmetrical in positive and negative swing (remember two's complement for an 8 bit number will be -128 to +127). Some will let you adjust