Browse Prior Art Database

Current Switch "Totem Pole"

IP.com Disclosure Number: IPCOM000081151D
Original Publication Date: 1974-Apr-01
Included in the Prior Art Database: 2005-Feb-27
Document File: 2 page(s) / 29K

Publishing Venue

IBM

Related People

Barish, AE: AUTHOR [+2]

Abstract

The circuit depicted provides high performance at low-power levels when operating in a high-loss environment (i.e., high capacitance, low-impedance wire). Transistors T1 and T2 constitute a current switch supplying complementary signals to transistors T3 and T4. Regardless of the transition direction, an output transistor, either T3 or T4, is always turning on (transistor T3 for a rising transition; transistor T4 for a falling transition). This feature provides the high-current capability and the low-output impedance necessary to drive long lossy transmission lines.

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Current Switch "Totem Pole"

The circuit depicted provides high performance at low-power levels when operating in a high-loss environment (i.e., high capacitance, low-impedance wire). Transistors T1 and T2 constitute a current switch supplying complementary signals to transistors T3 and T4. Regardless of the transition direction, an output transistor, either T3 or T4, is always turning on (transistor T3 for a rising transition; transistor T4 for a falling transition). This feature provides the high-current capability and the low-output impedance necessary to drive long lossy transmission lines.

A positive input voltage causes T1 to turn on while T2 turns off. The positive voltage at the collector of T2 turns on T4. The negative voltage at the collector of T1 turns off T3. A negative input voltage turns on T2 and T3 and turns off T1 and T4.

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