Glayout PrePEX SPICE Generation

[harshkhandeparkar]

Changes

• Added Netlist class for SPICE generation in glayout/spice/.
• Added SPICE models to the MappedPDK class.
• Added prePEX SPICE netlists for primitive cells, diff pair, differential_to_single_ended_converter.
• Added complete prePEX SPICE generation for the glayout op-amp.

[alibillalhammoud]

@harshkhandeparkar see changes when you get the chance. Mainly focus on keeping Netlist separate from layout. This is for easier debug in the future and for better code organization. Also make deepcopys within the Netlist class rather than having users decide when to deepcopy.

[alibillalhammoud]

Instead of doing a deepcopys for your get_netlist function. Wrap everything within the Netlist class. This is better for people using the API (most people do not think to do a deep copy and the API should take care of that behind the scenes). If the get_netlist function takes a dictionary everytime, you can just deepcopy by default (probably easiest thing to do here).

[harshkhandeparkar]

The deepcopy cannot be done internally since the netlist can be referred to externally in the connect_subnets or other functions.

[alibillalhammoud]

Pass the shallow copy and on the first line of get_netlist or connect_netlist perform a deepcopy

[alibillalhammoud]

One function should not return both Netlist and Component. Add another function which makes a Netlist, and always add the Netlist directly to the component in the Component.info

[harshkhandeparkar]

Here, I need the reference to the NMOS, amp_fet_ref, since its netlist is required for generating the output stage netlist.

[harshkhandeparkar]

I refactored the rest.

[alibillalhammoud]

If you need the netlist put it into the component itself. When you return the component you will have the netlist

[harshkhandeparkar]

This component already has a netlist

[alibillalhammoud]

same issue (one function should not return netlist and Component)

[harshkhandeparkar]

I have refactored most of it but I still need a reference to the mimcap netlist.

[alibillalhammoud]

put it into the component.info and only return the component

[alibillalhammoud]

As discussed above, where ever applicable make deepcopys of inputs so that the whoever uses this class does not need to.

[alibillalhammoud]

@harshkhandeparkar see changes when you get the chance. Mainly focus on keeping Netlist separate from layout. This is for easier debug in the future and for better code organization. Also make deepcopys within the Netlist class rather than having users decide when to deepcopy.

[alibillalhammoud]

Much better. just deepcopy on the first line of connect_netlist or get_netlist and you should be fine to avoid it everywhere else

[alibillalhammoud]

Pass the shallow copy and on the first line of get_netlist or connect_netlist perform a deepcopy

[alibillalhammoud]

If you need the netlist put it into the component itself. When you return the component you will have the netlist

[alibillalhammoud]

put it into the component.info and only return the component

[alibillalhammoud]

implemented changes, nice job Harsh

[msaligane]

@harshkhandeparkar Can you add a description