IC Layout Basics: A Practical Guide

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1.

Use these given values to calculate how long to make each of the five resistors in the chart below.

Given:

R c

=

25 ?-microns

? b

=

1200 ?/ ?

W c

=

W b ? 1 micron

#

W b (microns)

R total (ohms)

Length between contacts

1a

20

1200

1b

2

10,000

1c

10

850

1d

50

200

1e

15

425

2.

Use these given values to calculate the contact resistance, the body resistance, and the total resistance of each of the five resistors in the chart below.

Given:

R c

=

60 ?-microns

? b

=

270 ?/ ?

#

L b

W b

W c

R contact, R body, R total

2a

100

10

8

2b

20

12

10

2c

45

6

4

2d

6

20

18

2e

27

50

48

Answers

1.

Use the formula given in the above text. Solve for L.

  • 1a.

    Resistor body length = 19.96 microns

  • 1b.

    Resistor body length = 16.58 microns

  • 1c.

    Resistor body length = 7.04 microns

  • 1d.

    Resistor body length = 8.29 microns

  • 1e.

    Resistor body length = 5.27 microns

2.

Use the formula given in the above text. Solve for R total.

  • 2a.

    • R total = 2700 + 2(7.5)

    • R total = 2715

    • R body = 2700 ?

    • R contact = 7.5 ?

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