Abstract
Most of the bipolar logic families such asT 2 Land I2L are saturated-mode logic circuits. The fact that BJTs are driven into saturation slows the circuits’ operation. Some techniques have been used to prevent hard saturation such as Schottky clamping. The purpose of this chapter is to introduce the nonsaturating current-mode bipolar logic. In essence this is achieved by limiting current and voltage swings to ensure only active-mode BJT operation. The benefits are major speed improvements due to decreased stored minority charge and reduced voltage swing. The operation of nonsaturating logic is based on current switching. Therefore, it is most commonly known as Current Mode Logic (CML). This chapter deals with the analysis and design of two types of current mode logic families; the Emitter-Coupled Logic (ECL)and the Emitter Function Logic (EFL).
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