Discussion
Which of the following represents a transistor in stick diagram of VLSIs ?
Answer: C
A transistor is shown by red crossing green.
In the colour code of stick diagrams (Mead and Conway), green is diffusion, red is polysilicon, blue is metal and black marks contacts. Wherever a polysilicon line crosses a diffusion line, the polysilicon forms the gate over a channel, so a red line crossing a green one is a MOS transistor.
Blue (metal) crossing green or red forms no device, because metal is separated from the layers below by oxide; the two simply pass over each other unless joined by a contact. Brown is not part of the standard scheme.
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