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Interchanger 1 Circuit

IP.com Disclosure Number: IPCOM000075088D
Original Publication Date: 1971-Jul-01
Included in the Prior Art Database: 2005-Feb-24
Document File: 2 page(s) / 26K

Publishing Venue

IBM

Related People

Maley, GA: AUTHOR [+2]

Abstract

This is a ternary logic circuit for an interchanger 1 logic function, whereby for an input of levels 0, 1 or 2 an output is available with levels 2, 1 or 0, respectively.

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Interchanger 1 Circuit

This is a ternary logic circuit for an interchanger 1 logic function, whereby for an input of levels 0, 1 or 2 an output is available with levels 2, 1 or 0, respectively.

Transistors T4 and T5, together with resistors R3 and R4, constitute two current sources. When the signal at Vin is 0, transistor T1 is off and the current from transistors T4, T5 flows through transistors T2, T3 and resistor R2. No current flows through resistor R1, the load resistor of transistor T1, and hence, the potential of line 11 at the collector of transistor T1 is at its uppermost level designating a 2. Transistors T6, T7 and resistors R5, R6 constitute an emitter- follower having two diode drops in order to make the input and output voltage levels equal. The potential at output Vout is therefore at its uppermost level designating a 2.

If the input potential at Vin is at a 1 level, transistor T2 shuts off, and transistor T1 conducts a single unit of current from transistor T4. Both output Vf and Vout will then be at the intermediate level designating a 1. If the input potential at Vin is at its uppermost level designating a 2, then both transistors T2 and T3 are shut off and transistor T1 conducts two units of current, one unit from transistor T4 and the other from transistor T5. The output at Vf is at its uppermost level designating a 2 and the output at Vout is at its lowermost level designating a 0. Diode D serves to prevent transistor T3 from being shut off w...