Hello, everyone, I'm a graduate student in China, it's very happy to join in you. I want to do some research of Sigma Delta ADC? Can you give me some advices? thank you very much. Excuse for my poor English.
Sigma-delta ADC is included two parts, one for adc and the other oof sigma-delta. Sometime besides of sigma-delta, over-sample is added. Before you do sigma-delta adc design you need do system level design to determine how may order of you need. Based on the order, then you design the system fuction, basiscally signal flow or modultor.
Well, thank you very much. I also have a question, as we all know that, the most circuit is digital, can I design this part by HDL? which is better, verilog or VHDL?
unfortunately most of the sigma-delta ADC is ANALOG )) Sigma-Delta ADC has 2 parts: modulator (analog) and decimation filter (digital). Usually modulator is the most difficult part of the design.
I would recommend you to read some basic overview about ADCs and sigma-delta ADCs. IMHO, the appropriate chapters from Davis & Martin would be ok..
P.S. Comparing VHDL and Verilog - they are similar, its your choice what to choose.. Look which similator you have (especially if you wantr to use analog or mixed signal extensions like Verilog-A/Verilog-AMS or VHDL-AMS) for behavioral simulations.
for analog part of sigma delta adc ( sigmadelta modulator), system define is very important, so behavior simulation must be done before transistor level simulation. I think it is good for you to refer some basic books or papers to understand transfer function, then add more and more nonideality to behavior model, at last there will be only opamp and comparator to design
It's so kind of all of you. Now I'm learning DSP and verilog by myself, are they useful? And what other should I learn? Please tell me ,thank you very much.
Verilog is most popular tool for logic synthesis (ASIC),Verilog-A for analog,verilog-AMS for mixed-signal.
U need to understand Verilog first.However, it will take a long time to master both the language and analog IC design skills.
hi,
Before you start your circuit design, I suggest you should learn more about the
sigma-delta ADC spec, including the SNR, the THD+N and so on.
the system view is more difficuilt than circuit design.
also you can easily find reference about it.
Brs,
To gevy,
Do you have that sigma-delta ADC book ? Can upload to here ? I'm also interested in sigma-delta ADC circuit design , but I did not know how to design decimation filter , anyone one has some design example regarding how to implement a digital filter using Verilog ?
By the way , I think to design a sigma-delta ADC , the system simulation should be done by some math. tools such as matlab. I can not found the matlab files regarding the sigma-delta ADC circuit design , anyone knows where can I found such kind of M-file ?
It's very lucky, I have some. It is about 2-order, 3-order, 4 order model, noise model, SNR caculation and so on, I'm not very clear, hope it useful to you.