Browse Prior Art Database

Functional Diode

IP.com Disclosure Number: IPCOM000083742D
Original Publication Date: 1975-Jul-01
Included in the Prior Art Database: 2005-Mar-01
Document File: 2 page(s) / 40K

Publishing Venue

IBM

Related People

Liang, RN: AUTHOR [+2]

Abstract

This description is directed to the use of an isolation junction in an integrated circuit structure, as a functional diode.

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Functional Diode

This description is directed to the use of an isolation junction in an integrated circuit structure, as a functional diode.

Fig. 1 is a schematic diagram of the silicon-controlled switch configuration for a gas panel driver, without decode circuitry. Transistors T2 and T3 constitute an SCS (silicon-controlled switch), which when conducting, electrically connects the output terminal (Out) such that current can be conducted to VL via diode D2 and transistor T2. Current is sourced via diode D1 from VL to Out. (Diode D1 and Diode D1' are the subject of this description.)

To turn the SCS on requires a positive pulse to transistor T5 which goes into conduction, turning on transistor T3, which turns on transistor T2. Feedback from transistor T2 to the base of transistor T3 keeps the SCS on when the set terminates. Under the above condition transistor T7 is off, as are transistors T6 and T4.

If a positive pulse is applied to transistor T1 (assuming the SCS on), transistor T1 will go into conduction turning transistor T2 off which breaks the feedback path to transistor T3, turning it off. Transistor T7 will then go into conduction, providing a base current for transistor T6 and transistor T1.

Transistor T7 and its related circuitry provide a constant current to the base of transistor T6, whose emitter provides the current to the base of the emitter- follower transistor T4. Under this condition, VU can source current to the output (Out) via transistor T4....