Bulk Type Unavailable in Schematic L

Dear abdallahelsayyed,

abdallahelsayyed said:

I'm using IC614 environment with a TSMC65N PDK, and the body type (integrated/detached) isn't shown when making the schematic, why is that?

I apologize, but it appears there is a body terminal from what I can see in your schematic. I've circled what appears to the substrate pin  (i.e., body) on the nmos and pmos devices. Am I misunderstanding your question?

Let me add, however, that in my experience with the TSMC6r PDK, I believe there are a number of 

Dear abdallahelsayyed,

(My initial reply was prematurely posted when I logged in...I did not hit the "Reply" button yet, but it was posted nonetheless - sorry!)

abdallahelsayyed said:

I'm using IC614 environment with a TSMC65N PDK, and the body type (integrated/detached) isn't shown when making the schematic, why is that?

I apologize, but it appears there is a body terminal from what I can see in your schematic. I've circled what appears to the substrate pin  (i.e., body) on the nmos and pmos devices. Am I misunderstanding your question? Perhaps you are indicating that the terminal is hardwired to the drain node for the pmos device and the source node for the nmos device?

Figure 1

Annotated copy of your screenshot with body terminals highlighted

If so, let me add that in my experience with the TSMC65 PDK, there are a number of pmos and nmos devices symbols included in the kit for a given device. Each has a different model name and some include a distinct body terminal pin and others do not show a body pin at all (but it is connected to the positive supply for pmos devices and negative supply for nmos devices). As an example, in Figure 2, I show a 65 nm TSMC based nmos device that does have a distinct body terminal. Note that the name is "nah_lvt" and not simply "nch" as in your schematic. Have you checked your PDK to see if there are other MOS models for pmos and nmos devices other than "pct" and "nch" respectively?

Figure 2

Example 65 nm Schematic

Shawn, the question has nothing to do with the presence or otherwise of the bulk pin on the symbol. The question is about controlling the "bodytie" parameters on the device to say whether there is an "integrated" (misspelt as "integred") or "detached" well/bulk contact on the left or right side of the device.

I checked with an old version of the PDK I happened to have (given that abdallahelsayyed is using an ancient IC version (IC614, really? That is going to be at least 10 years old), I thought that it might be OK). Anyway, in that PDK I see that the bodytie_typeL and bodytie_typeR parameters only show up in the layout editor; in some TSMC PDKs they have a checkbox to show layout parameters in the schematic, but not this one. Maybe a more recent N65 PDK might have this, but not in the version I tried nor in the version you're using.

Andrew