Emitter-coupled logic (ECL) circuits have often been employed in very high-speed VLSI circuits. However, a passive pull-down scheme in an output stage results in high power dissipation as well as slow pull-down transition. Gate stacking in a current switch logic stage keeps ECL circuits from operating at low power supply voltages. In this section, a high-speed active pull-down scheme in the output stage, as well as a low-voltage series-gating scheme in the logic stage will be presented. The two circuit techniques can be employed together to obtain multiple effects in terms of speed and power.
ASJC Scopus subject areas
- Computer Science(all)