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Re: op amp dc bias phase shift
I think R0 of your testbench should be replaced by inductor (ind).
It would be difficult to get the correct DC bias with so large feedback resistor.
Therse are three methods to start ncsim:
1. Three steps for terminal
ncvlog *.v
ncelab top_module_name (-nc_options)
ncsim top_module_name (-nc_options)
2. one step for terminal
ncverilog *.v (+nc_options)
3. The easiest way to start ncsim is by GUI.
nclaunch &
digital: Calibre
Custom digital/analog: Assura
small analog design & older process for 0.18um: Diva
for RF circuit postsimulation: only for Assura rcx.
mmsim 6.1
Cadence only support matlab & AMS co-simulation. You should setup one mixed-signal simulation testbench and select ams simulator. Then you add the interface element to simulink/composer. At last run matlab and ams simultaneously.
SMIC provided 0.18/0.13um PDK of OA version which could be used for IC610. I think TSMC or other big fabs could provided it too.
But IC610's database is not compatible with IC5x. That is the key problem.
Do you sure these options about Cadence's simulator? Cadence spectre/ams/ultrasim's are different from it. Maybe is some third tools be integrated in ADE only.
Re: Current mode circuit
Most of current mode circuits' performance is poor, except few cases such as current steering DAC. It is difficult to build one negative feedback system.
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