Question

For a typical CMOS process, the minimum feature size is set to be 25 μm. The minimum line width at the process is set to be ______
1. 100 μm
2. 12.5 μm
3. 50 μm
4. 25 μm

Answer 1

Correct Answer - Option 3 : 50 μm

Concept:

Feature Size: The minimum feature size is the size or the width at which a transistor or any type of material on the silicon surface can be drawn at.

2. If the minimum feature size can be reduced, this means that the transistor length can be reduced effectively making the transistor smaller with the same electrical properties.

3. This allows for lower current flow between the junction for the same purpose and lesser heat dissipation.

The minimum line width is 2 × minimum feature size  ---(1)

Calculation:

Given:

Minimum feature size = 25 μm

Now the minimum line width can be calculated from equation (1)

Minimum line width = 2 × 25 μm

Minimum line width = 50 μm 

Hence option (3) is the correct answer.