Browse Prior Art Database

Field Effect Transistor Push Pull Driver

IP.com Disclosure Number: IPCOM000083000D
Original Publication Date: 1975-Mar-01
Included in the Prior Art Database: 2005-Feb-28
Document File: 2 page(s) / 32K

Publishing Venue

IBM

Related People

Daniels, RJ: AUTHOR [+2]

Abstract

In the figure, when the input signal is at a positive voltage level, transistors 11, 13 and 15 will be rendered conductive while transistor 17 and 19 are held off by the down level signals from the drain of transistor 11 to provide a downlevel voltage at the output terminal.

This text was extracted from a PDF file.
At least one non-text object (such as an image or picture) has been suppressed.
This is the abbreviated version, containing approximately 91% of the total text.

Page 1 of 2

Field Effect Transistor Push Pull Driver

In the figure, when the input signal is at a positive voltage level, transistors 11, 13 and 15 will be rendered conductive while transistor 17 and 19 are held off by the down level signals from the drain of transistor 11 to provide a downlevel voltage at the output terminal.

The downlevel voltage at the output terminal holds transistor 21 off allowing transistors 23 and 25 to charge capacitor 27. Although transistor 29 will also be conducting, transistor 29 is designed to have a much smaller area and, therefore, a much higher resistance than transistor 11, so that node 35 is at a voltage nearer ground reference potential when transistor 11 is conducting.

When the input signal goes to a downlevel, node 35 rises to an uplevel and transistor 13, which is directly controlled by the input, becomes nonconducting. The rise of node 35 allows transistor 31 to turn on and to charge capacitor 33 in about 50 nanoseconds. Transistor 17 is designed small enough so that it does not completely discharge the gate capacitance of transistor 15 to render transistor 15 nonconductive, until capacitor 33 has been substantially charged.

As the output voltage begins to rise, transistor 21 also becomes conductive to lower the bootstrap voltage on node 37 to less than +V. This action renders transistor 29 nonconductive as node 35 rises above +V under the influence of capacitor 33, and also renders transistor 25 nonconducting to isolate capacitor 27...