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Re: Guard Ring
leelamadhav is right for NWELL you use nmoat guard ring connected to the VDD and for PWELL you use pmoat connected to the GND. It is usually to lower noise on board ant isolate the device usually analog.
It is true than on first currents flow in the same direction but if you shift mask I dont see how first can be better because than M21 and M22 will have smaller D than S or vice versa but on the figure 2 shifting will afect the same D and S. So be carefull.
Re: assura lvs error
You have several substrats that are not connected together but some of them maybe floating you should connect them, check wells and conntacts and them metal lines.
Re: Ground and Substrate
You will nedd analog and digital groun separately or some filtring circuitry between analog and digital groun and than you can connect supstrate with grounds.
I used both and think that CADENCE is afcourse better more user frendly, when you master it and most important all big foundaries use cadence and have models and scripts adjusted for it.
I think ADC and DAC's will always be interesting for analog designers and also verilog or vhdl or avhdl is good to know because of its wide use but also power supllies and band gap references.
Re: output buffer?
I think that you can design it because you know specifications for output voltage and current, and maybe you can find some digital gates for this but +/-13 volts is a bit high for standard digital gates.
all layers and all part in ic layout must be connected to some potential. It's bad to have floating metal or well or any other component everithing must be connected.
wht is msps
MSPS is mega samples per second and its similar to MHz sampling frequency. Sampling frequency in DAC exists because it has its frequency of conversion and digital signal can be oversampled or interpolated and filtered in order to get better performances easear filtering and bigger SNR.
Re: Gate Oxide Capacitor
I think that you should connect source and drain together as one electrode and gate is the other and well must be connected (Nwell to a high potential).
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