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Personalizable Multi-Power Driver Circuit

IP.com Disclosure Number: IPCOM000041305D
Original Publication Date: 1984-Jan-01
Included in the Prior Art Database: 2005-Feb-02
Document File: 2 page(s) / 37K

Publishing Venue

IBM

Related People

Balyoz, J: AUTHOR [+4]

Abstract

An adaptable driver circuit is disclosed. Its configuration can be altered by metal personalization to operate at selectable speed/power levels. The figure shows a basic driver circuit which can be operated either as a medium power driver (MPD) or as a high power driver (HPD). When the connections marked with 1 are made, the circuit operates as an MPD. In this operation, the transistor Q3 and resistor R1 are not connected as part of the circuit. When the connections marked with 2 are made, the circuit operates as an HPD. In this case, the resistors R2 and R3 are not connected as part of the circuit, yet transistor Q3 and resistor R1 are connected. The transistor Q1, LSBD D1, resistors R4 and R5 form the predriver circuit which is used for DTL internal circuit interfacing, as shown in the figure.

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Personalizable Multi-Power Driver Circuit

An adaptable driver circuit is disclosed. Its configuration can be altered by metal personalization to operate at selectable speed/power levels. The figure shows a basic driver circuit which can be operated either as a medium power driver (MPD) or as a high power driver (HPD). When the connections marked with 1 are made, the circuit operates as an MPD. In this operation, the transistor Q3 and resistor R1 are not connected as part of the circuit. When the connections marked with 2 are made, the circuit operates as an HPD. In this case, the resistors R2 and R3 are not connected as part of the circuit, yet transistor Q3 and resistor R1 are connected. The transistor Q1, LSBD D1, resistors R4 and R5 form the predriver circuit which is used for DTL internal circuit interfacing, as shown in the figure. This predriver section of the circuit also provides a high number of Fan-In. In this specific design of the multi-power driver circuit, two power supplies VH and VL are used. To prevent simultaneous conductions of Q6 and Q7 in the medium power operation, a feedback transistor Q4 is used to discharge the base of Q6 when the transistor Q7 is in the conduction region. In the high power operation a Darlington pair in push-pull (Q3, Q6 and Q7) is used for high drivability. The down level at the output of this driver circuit can be tracked closely by using a temperature compensated clamp transistor Q5. Resistor R1 controls the down-leve...