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CMOS ring oscillators as teaching tools

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4 Author(s)
Moore, D.F. ; Eng. Dept., Cambridge Univ., UK ; Holburn, D.M. ; Nockolds, C.E. ; Rosolen, G.C.

A set of full custom CMOS chips has been designed in undergraduate projects in each of the past five years (1987 to 1992). Experience of several generations of ring oscillators has shown their usefulness both as teaching tools in set experiments and as projects. Using a ring containing 113 elements, high-performance gates with subnanosecond delays can be measured using teaching laboratory equipment and the results can be compared with SPICE simulations of the devices. Students also use a scanning electron microscope on the CMOS ring chips which contain stripped-own logic gates to allow examination of the device construction and technology

Published in:

Circuits, Devices and Systems, IEE Proceedings G  (Volume:139 ,  Issue: 2 )

Date of Publication:

Apr 1992

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