Slide 26 of 64
Lest we conclude that CMOS logic is necessarily cooler than bipolar, one should take note of the increasing problem of removing heat from chips such as the DEC Alpha 21164. A key problem for CMOS is also the increasing power dissipation density in watts per square centimeter of surface area. Eventually this could be one of the show stoppers for continuing shrinkage in CMOS. What one would like is a technology in which the power actually drops as the square of the scale factor. This would keep the power dissipation density constant between scalings.