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Browse Prior Art Database

Field Effect Transistor Bidirectional Driver Control Circuit

IP.com Disclosure Number: IPCOM000080525D
Original Publication Date: 1974-Jan-01
Included in the Prior Art Database: 2005-Feb-27
Document File: 2 page(s) / 29K

Publishing Venue

IBM

Related People

Scarpero, WJ: AUTHOR

Abstract

This circuit reduces the number of transistors needed to control bidirectional drivers in applications where output dotting is required. Transistors 1 through 6 replace the eight devices used in the equivalent NAND and NOR circuits. Transistors 7 and 8 represent the driver to be controlled.

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Field Effect Transistor Bidirectional Driver Control Circuit

This circuit reduces the number of transistors needed to control bidirectional drivers in applications where output dotting is required. Transistors 1 through 6 replace the eight devices used in the equivalent NAND and NOR circuits. Transistors 7 and 8 represent the driver to be controlled.

When gating input signal g is in the "1" state (V+ volts), data signal d determines the level at the gates 9, 10 of the driver devices 7 and 8. If input d is at ground level, transistors 1, 2 and 5 are on, providing a path to V+ for both driver gates 9, 10 through devices 1 and 2 and transistor 8 drives the output to ground level. If input d is at V+ volts, transistors 2,3, and 5 are on, providing a path to ground for both gates 9, 10 and the output is driven to V+ volts.

When gating input g is in the "0" state (at ground level) both driver devices 7 and 8 are turned off, regardless of the state of input d. Transistors 4 and 6 are on and devices 2 and 5 are off. The gate 9 of transistor 7 is held to V+ by transistor 4, and the gate 10 of transistor 8 is held to ground by transistor 6.

No DC power is consumed by the control circuit if enhancement mode transistors are used. In addition, all circuit functions are performed by field-effect transistors (FET's) in the low-resistance (common-source) mode, allowing the highest possible performance.

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