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# Logic Circuit with Complementary Outputs

IP.com Disclosure Number: IPCOM000095150D
Original Publication Date: 1965-Sep-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 2 page(s) / 27K

IBM

## Related People

Nielsen, ED: AUTHOR

## Abstract

This circuit has four transistors and produces both the true and the complement outputs at terminals 3 and 2 of an input terminal. Transistor T5 is connected with a resistor in its emitter circuit. Its base receives the circuit input. Transistor T6 is connected in an inverter configuration. Its base connects to the emitter of T5 and, with a resistor connected to it, forms the complement circuit output at its collector. Transistor T7 is connected in a common based configuration with its base connected to a suitable reference point 8. Its emitter connects to the emitter of T5. Resistor 9 is connected in its collector circuit. Thus, T7 produces a signal at its collector. The signal is in phase with the signal at the emitter of T5 and with the circuit input.

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Logic Circuit with Complementary Outputs

This circuit has four transistors and produces both the true and the complement outputs at terminals 3 and 2 of an input terminal. Transistor T5 is connected with a resistor in its emitter circuit. Its base receives the circuit input. Transistor T6 is connected in an inverter configuration. Its base connects to the emitter of T5 and, with a resistor connected to it, forms the complement circuit output at its collector. Transistor T7 is connected in a common based configuration with its base connected to a suitable reference point 8. Its emitter connects to the emitter of T5. Resistor 9 is connected in its collector circuit. Thus, T7 produces a signal at its collector. The signal is in phase with the signal at the emitter of T5 and with the circuit input. Transistor T10 is connected with two resistors as an emitter follower to produce the true output at terminal 3 in response to the voltage at the collector of T7.

The connection of T5 and T7 forms a current switch with two true outputs. One is at the collector of T7. The other is at the common emitter connection of T5 and T7. The circuit of T5 and T7 functions in part as a current mode circuit. The input voltages to the base of T5 are made to vary sufficiently about the voltage of reference potential point 8 so that the circuit also functions in the voltage mode for supplying the base voltage to T6.

With this circuit, the input can be connected to receive the output of a di...