THREE LEVELS of Cascode With Differential and Single-Ended Circuits Under 3.4 Volts
Original Publication Date: 1987-Mar-01
Included in the Prior Art Database: 2005-Feb-01
With conventional ECL (emitter-coupled logic) single-ended circuits, it is possible to cascode only 2 levels in the same ECL tree. With the ECL differential three levels can be cascoded under the same 3.4-volt power supply. (Image Omitted) This article presents a new circuit which can uses a mix of the 2 types of ECL with three levels of cascode. The main advantage of such a circuit is to increase the number of logical functions which can be implemented in a single circuit (tree), resulting in an overall decrease of the power dissipation and in the number of devices. The proposed circuit has 3 levels of cascode ECL under 3.4 volts which is a standard power supply. The 2 upper levels can be used with single-ended or differential ECL circuits while on the lower level only differential ECL is possible.