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Merged Transistor Logic With Power Driver

IP.com Disclosure Number: IPCOM000077980D
Original Publication Date: 1972-Oct-01
Included in the Prior Art Database: 2005-Feb-25
Document File: 2 page(s) / 41K

Publishing Venue

IBM

Related People

Berger, HH: AUTHOR [+2]

Abstract

A Merged Transistor Logic (MTL) is built of blocks consisting of lateral PNP and inversely operated vertical NPN transistors, which are integrated without isolation zones and resistors. As these logic blocks have a low-current amplification, an additional output driver transistor is provided. Fig. 1 shows the equivalent circuit diagram.

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Merged Transistor Logic With Power Driver

A Merged Transistor Logic (MTL) is built of blocks consisting of lateral PNP and inversely operated vertical NPN transistors, which are integrated without isolation zones and resistors. As these logic blocks have a low-current amplification, an additional output driver transistor is provided. Fig. 1 shows the equivalent circuit diagram.

A lateral PNP transistor T1 with its collector-base path is arranged in parallel to the base-emitter path of two inversely operated NPN transistors T2, T2', the emitters and bases of which are connected. The bases of T2 and T2' and collectors C2 and C2' form the logic input I and the logic output of the MTL stage, respectively.

A vertical NPN transistor T3, comprising a resistor R and which is operated as an emitter-follower, serves as a driver stage. The base-collector path of T3 and the collector-base path of a further lateral PNP transistor T1' are connected in parallel. Collector C2' of T2' is linked with the base of T3. Emitter E1' of T1' is connected to emitter E1 of T1.

Fig. 2 is a cross-sectional view of the structure. In an N1 substrate, common to the emitters of T2 and T2', the bases of T1 and T1' and the collector of T3, the P2 and P3 collectors of lateral T1 and T1' are arranged on both sides of their common p1 emitter E1, E1'. The p2 collector simultaneously forms the bases of vertical inversely operated T2 and T2' and incorporates their N2 and N2' collectors C2 and C2', where...