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1. (WO1985002956) ECL GATE WITH SWITCHED LOAD CURRENT SOURCE

Pub. No.:    WO/1985/002956    International Application No.:    PCT/US1984/002059
Publication Date: Jul 4, 1985 International Filing Date: Dec 12, 1984
IPC: H03K 19/00
H03K 19/086
Applicants: ADVANCED MICRO DEVICES, INC.
Inventors: VARADARAJAN, Hemmige, D.
Title: ECL GATE WITH SWITCHED LOAD CURRENT SOURCE
Abstract:
A standard ECL OR/NOR gate is modified to have a single current source (30) connected to the load current source transistors (10, 11). The single current source (30) is connected to the emitters of each of the load current source transistors (10, 11). Switching between the two load current source transistors (10, 11) is accomplished by connecting the base of at least one of the load current transistors (10) to a circuit point (c) that tracks the opposite phase. In one embodiment (Fig. 2) the base of one of the load current source transistors (10, 11) is connected to the common emitter connections (C) of the input transistors (15, 16) and the reference transistor (17) while the base of the other load current source transistor (11) is connected to a reference voltage source (VBBL) having a value intermediate the extreme values which appear on the common emitter connections of the input transistors (15, 16) and the reference transistor (17). In an alternate embodiment (Fig. 6) the base of each load current source transistor (10, 1) is connected to a suitable point (e, f) which tracks the opposite phase outputs of the particular load current source transistor (10, 11).