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1. Building an adder with transistors in analog library

About building an adder If I build a 20-bit adder with transisters in analog library (because I don't have digital library), is it much different from the adder building with digital standard cell? And what should I pay attention to build it? When it is finished, how can I simulate to make sure...
2. Building an adder with transistors in analog library

About building an adder If I build a 20-bit adder with transisters in analog library (because I don't have digital library), is it much different from the adder building with digital standard cell? And what should I pay attention to build it? When it is finished, how can I simulate it easily...
3. Help about simulation of prescaler!

How to simualte the maximum working frequency of a prescaler and its power consumption? Thanks!
4. Fref of delta-sigma modulator in PLL

A 3-order MASH modulator in fractional-N pll, each stage uses a 20-bit accumulator. How fast can it work? And generally what frequency does it work at? Thanks!
5. About wc of fractional-N pll

How to decide ωc of fractional-N pll if the specs such as settling time and Fref are known? Can I use T_set=-lnε/ωc (ε is the accuracy)?
6. hlp! Prescaler in fractional frequency synthesizer

The center freq. of VCO is 1.8G, so for fractional pll frequency synthesizer, 8/9 and 16/17 prescaler, which one is better choice? (Fref is 26MHz, when 16/17 prescaler is used ,the Fref is divided by 4).
7. What's the difference between SNR and SQNR?

What's the difference between them? Thanks!
8. Need help about delta-sigma modulator!

multi-bit single-loop ΔΣ modulator used in frequency synthesizer. I don't know how to simulate it. Who can show me some simulations about it? Thanks!
9. How to simulate a quantizer in Matlab?

matlab problem In the figure, if the quantizer output is 16-bit binnary,4 MSBs are out, the left 12 LSBs are feedback. How to simulate the quantizer in matlab? My main problem is I don't know how to deal with binary numbers in matlab.
10. About single loop multibit delta-sigma modulators

multi bit single loop sigma delta used in fractional-N frequency synthesizer i can't understand the multi-bit quantizer,for a 16-bit modulator,how many bits the feedback is? Is it ture that the MSBs of the last accumulator output is the quantizer output and the feedback is the remaing LSBs?Is...
11. what's the difference between dynamic range and SNR?

for delta-sigma modulator,what's the difference between dynamic range and SNR?
12. help about delta-sigma frequency synthesizer

using 3-order single loop multibit delta-sigma modulator,how to design the multibit quantizer? assume the accumulator is 20bit, using 4-bit quantizer.
13. About MASH and single loop multibit delta-sigma modulators

In ΔΣ fractional-N frequency synthesizer, MASH or single loop multibit Δ-Σ modulators are usesd. The structure of MASH is obvious,which is some accumulators , adders and registers, my question is how to realize it? Using transistors to build it or using verilog to generate it? And how to realize...