Browse Prior Art Database

AC Tuning Element for Extrinsic Base Resistance

IP.com Disclosure Number: IPCOM000079740D
Original Publication Date: 1973-Aug-01
Included in the Prior Art Database: 2005-Feb-26
Document File: 2 page(s) / 33K

Publishing Venue

IBM

Related People

Dorler, JA: AUTHOR [+3]

Abstract

The present circuit provides a means of slowing down a higher speed logic family, such as the illustrated current-switch circuit of Fig. 1, in order to allow it to become compatible with other circuits having slower operating switching speeds. The circuit illustrates a conventional well-known current switch emitter-follower circuit, for providing an in-phase signal 0 at output terminal 10 and an out-of-phase output signal 0 at output terminal 12, in response to logic signals applied to the input switching transistors at terminals 14 and 16, for example.

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 100% of the total text.

Page 1 of 2

AC Tuning Element for Extrinsic Base Resistance

The present circuit provides a means of slowing down a higher speed logic family, such as the illustrated current-switch circuit of Fig. 1, in order to allow it to become compatible with other circuits having slower operating switching speeds. The circuit illustrates a conventional well-known current switch emitter-follower circuit, for providing an in-phase signal 0 at output terminal 10 and an out-of- phase output signal 0 at output terminal 12, in response to logic signals applied to the input switching transistors at terminals 14 and 16, for example.

In order to vary or slow down the circuit by a tuned extrinsic base resistance, rb(ext), the geometries of the integrated circuit can be varied, as illustrated in Fig.
2. The Fig. 2 illustration shows various geometries for positioning the base region B with respect to the emitter region E, in order to obtain a tailorable increase in value of rb(ext), proceeding from left to right.

1

Page 2 of 2

2

[This page contains 3 pictures or other non-text objects]