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Browse Prior Art Database

An Up-Level Compensator for All NPN Logic Circuits

IP.com Disclosure Number: IPCOM000120170D
Original Publication Date: 1991-Mar-01
Included in the Prior Art Database: 2005-Apr-02
Document File: 1 page(s) / 26K

Publishing Venue

IBM

Related People

Han, B: AUTHOR [+5]

Abstract

In an all-npn NOR circuit, such as Half-Current Switch, the up-level output is directly affected by the VCC. (Image Omitted)

This text was extracted from an ASCII text file.
This is the abbreviated version, containing approximately 100% of the total text.

An Up-Level Compensator for All NPN Logic Circuits

      In an all-npn NOR circuit, such as Half-Current Switch, the
up-level output is directly affected by the VCC.

                            (Image Omitted)

      In place of elaborate compensating circuitry, a
diode-configured transistor TA can be used in conjunction with a
resistor to control the up-level output.

      The collector-base node of the diode is connected to an
appropriate point in the resistor in the collector of the switching
transistor, Tin.  The emitter resistor REA is terminated in a
convenient voltage.  This control circuitry is designed with minimum
VCC, allowing a minimum IE in TA. When VCC reaches its maximum level,
VBE of TA is also at its maximum along with a maximum IE in TA
and RC.  This additional IE TA reduces the uplift of VCC on the
up-level output.

      Disclosed anonymously.