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Low-voltage positive emitter-coupled logic (LVPECL) is a power optimized version of __________

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Low-voltage positive emitter-coupled logic (LVPECL) is a power optimized version of __________

(a) ECL

(b) VECL

(c) PECL

(d) LECL

I got this question at a job interview.

This intriguing question originated from Emitter-Coupled Logic(ECL) in portion Logic Families of Digital Circuits

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The correct answer is (c) PECL

Easy explanation: Low voltage positive emitter coupled logic (LVPECL) is a power optimized version of PECL using a +3.3 V instead of 5 V supply.

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