Stick Diagrams Questions and Answers

Q: In the CMOS stick diagrams the n and p transistors are separated by :

The n and p transistors are separated by a dotted brown line.In the colour code used for CMOS stick diagrams (as in Pucknell and Eshraghian's Basic VLSI Design), the n-well or demarcation line that divides the region of n-transistors from the region of p-transistors is drawn in brown.The other colours have their own meanings in the same scheme: blue is metal, yellow is p-diffusion, and black marks contact cuts. None of them is the demarcation line.

Q: Which of the following represents a transistor in stick diagram of VLSIs ?

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.

Q: Assertion (A) : A stick diagram is an easy method to create schematic circuit of a logic gate.Reason (R) : The stick diagram uses 'sticks' or lines to represent the devices and conductors.

The key gives Both (A) and (R) are true and (R) is the correct explanation of (A).A stick diagram is a simple, quick way of drawing the circuit of a logic gate in a form close to its layout: each transistor, conductor and layer is shown as a coloured stick or line, without exact widths or spacings. It lets a designer plan the topology of a gate before drawing the full mask layout, which is the sense of statement A.It is easy precisely because it uses sticks or lines to represent devices and conductors, as R says, so R explains A. The options calling either statement false are therefore wrong.

In the CMOS stick diagrams the n and p transistors are separated by :

A.Thick black line
B.Dotted blue line
C.Thick yellow line
D.Dotted brown line

Exam Year(s)

MH SET - 2020, SET Exam - 2020,

Answer: D

The n and p transistors are separated by a dotted brown line.

In the colour code used for CMOS stick diagrams (as in Pucknell and Eshraghian's Basic VLSI Design), the n-well or demarcation line that divides the region of n-transistors from the region of p-transistors is drawn in brown.

The other colours have their own meanings in the same scheme: blue is metal, yellow is p-diffusion, and black marks contact cuts. None of them is the demarcation line.

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Which of the following represents a transistor in stick diagram of VLSIs ?

A.Black Crossing Blue
B.Red Crossing Brown
C.Red Crossing Green
D.Blue Crossing Green

Exam Year(s)

MH SET - 2021, SET Exam - 2021,

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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Assertion (A) : A stick diagram is an easy method to create schematic circuit of a logic gate.
Reason (R) : The stick diagram uses 'sticks' or lines to represent the devices and conductors.

A.Both (A) and (R) are true and (R) is the correct explanation of (A)
B.Both (A) and (R) are true but (R) is not the correct explanation of (A)
C.(A) is false but (R) is true
D.(A) and (R) both are false

Exam Year(s)

MH SET - 2023, SET Exam - 2023,

Answer: A

The key gives Both (A) and (R) are true and (R) is the correct explanation of (A).

A stick diagram is a simple, quick way of drawing the circuit of a logic gate in a form close to its layout: each transistor, conductor and layer is shown as a coloured stick or line, without exact widths or spacings. It lets a designer plan the topology of a gate before drawing the full mask layout, which is the sense of statement A.

It is easy precisely because it uses sticks or lines to represent devices and conductors, as R says, so R explains A. The options calling either statement false are therefore wrong.

Discuss in Forum

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Stick Diagrams Questions and Answers

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