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Browse Prior Art Database

Exclusive or Circuit

IP.com Disclosure Number: IPCOM000098215D
Original Publication Date: 1960-Apr-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 2 page(s) / 45K

Publishing Venue

IBM

Related People

Greenhalgh, RC: AUTHOR

Abstract

Two converting AND transistor-resistor logic blocks and one inverting AND transistor-resistor logic block combine to perform the Exclusive OR function according to the table.

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Exclusive or Circuit

Two converting AND transistor-resistor logic blocks and one inverting AND transistor-resistor logic block combine to perform the Exclusive OR function according to the table.

Zero voltage A and B input signals and negative potential bar A and bar B input signals are applied to terminals 1 and 2, respectively. Block 3, an inverting AND circuit, produces a zero voltage output at point 4 when either terminal 1 or terminal 2 is negative. Blocks 5 and 6 produce zero potential outputs at point 7 whenever both inputs to block 5 or both inputs to block 6 are at zero potential.

The bar A * bar B function is shown by the table as negative input at terminal 1, as negative input at terminal 2, that block 3 is on and that point 4 is at zero potential. Negative potential applied at terminal 1 to line 8 biases block 5 to cutoff. Negative potential applied at terminal 2 to line 9 holds block 6 at cutoff. With both blocks 5 and 6 cut off, point 7 rises to positive potential which is recognized as the A XNOR B functional signal.

The AB function appears when the input at terminal 1 rises to zero, which provides coincident zero voltage inputs to block 5 which conducts. Conduction of block 5 lowers the potential at point 7 to zero volts which is recognized as the A XOR B functional signal. The bar A * B function is symmetrical with the A * bar B function, block 6 being biased on and point 7 remaining at zero volts.

The AB function occurs when zero voltage signals...