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Inverter Speed Up

IP.com Disclosure Number: IPCOM000090987D
Original Publication Date: 1969-Sep-01
Included in the Prior Art Database: 2005-Mar-05
Document File: 2 page(s) / 21K

Publishing Venue

IBM

Related People

Harper, LR: AUTHOR

Abstract

In this And-Invert circuit, And diodes 10 and 12 are hot carrier diodes and diode 14 is a conventional silicon diode. Hot carrier diodes characteristically have lower voltage drops than conventional diodes. For this reason, the use of diodes 10 and 12 requires a greater level for energizing the circuit and hence greater noise immunity. In addition, hot carrier diode 16 is connected from collector of inverter transistor 18 through the forward direction of the diode to the base of transistor 18. The collector-to-base voltage is therefore about .4 volts so that there is no transistor hole storage and turnoff of transistor 18 is speeded up. If desired, another hot carrier diode 20 can be used or two diodes 20 and 22 in series back-to-back can be utilized with diode 16 to limit the rise of the base of transistor 18.

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Inverter Speed Up

In this And-Invert circuit, And diodes 10 and 12 are hot carrier diodes and diode 14 is a conventional silicon diode. Hot carrier diodes characteristically have lower voltage drops than conventional diodes. For this reason, the use of diodes 10 and 12 requires a greater level for energizing the circuit and hence greater noise immunity. In addition, hot carrier diode 16 is connected from collector of inverter transistor 18 through the forward direction of the diode to the base of transistor 18. The collector-to-base voltage is therefore about .4 volts so that there is no transistor hole storage and turnoff of transistor 18 is speeded up. If desired, another hot carrier diode 20 can be used or two diodes 20 and 22 in series back-to-back can be utilized with diode 16 to limit the rise of the base of transistor 18. The inverter is kept out of saturation which results in a faster circuit response time.

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