_ Department of Integrated Circuits (ASIC)

( ASIC integrated circuits)  -  (ECL logic) using Totem-Polo output class

Researcher  and author:  Dr. (   Afshin Rashid)


Note: Emitter-couple logic family (ECL) Another family that   uses ( ASIC integrated circuits) is called base-emitter-couple logic; This family   uses  ( ASIC integrated circuits) whose logic blocks  are connected to each other. 

This structure (  logical blocks  connected together), which is the foundation of ECL circuits , plays the role of an analog current switch in analog circuits like a differential amplifier.  Output inverting  logic blocks are not used in the ECL family. In this family  ( ASIC integrated circuits)  they work only in the direct and cut-off active regions and do not enter the saturation region; Unlike the sub-families  ( ASIC integrated circuits)  used in the ECL family,  they are not  inverting logic blocks.  Due to the non-saturation of  the  inverting logic blocks  in ECL, there is no need for additional circuits to speed up or down circuits, and the circuits are simpler. . 


The specifications related to the output and switching speed in the ECL family are better than the TTL family, so that the delay times in this gate are about 1 nsec, the working frequency is more than 1 GHz, and for these features, the power consumption increases; In fact, the increase in power consumption is 25, the costs that must be paid in order to increase the speed and output. As we can see, logic switching in ECL is less than TTL sub-families. Small logic switching together with the use of   inverting  logic blocks and a constant current source and not using the Totem-Polo output stage eliminates needle currents and creates less sensitivity to noise.


Application of  inverting   logic blocks (ECL logic) 

The biggest advantage of ECL over bipolar is the high density of circuits in the package, the simplicity of the manufacturing technique and its cost-effective operation due to low power consumption.  Due to the countless advantages, integrated circuits   are exclusively used in the preparation of all kinds of parts necessary in the design of systems ( ASIC integrated circuits)To understand the organization and design  ( ASIC integrated circuits) , familiarity with the types of parts and components used in integrated circuits is important. For this reason, these components provide a set of digital operational units that are   used in the design of digital ( ASIC integrated circuits)   

Researcher  and author: Dr.   (   Afshin Rashid)

Specialized doctorate in nano-microelectronics