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Browse Prior Art Database

Active Pull-Up Receiver

IP.com Disclosure Number: IPCOM000047591D
Original Publication Date: 1983-Dec-01
Included in the Prior Art Database: 2005-Feb-07
Document File: 2 page(s) / 33K

Publishing Venue

IBM

Related People

Ritchie, LC: AUTHOR [+2]

Abstract

The disclosed circuit employs an active pull-up output stage to provide better current drive for large capacitive loading. Referring to the schematic, T1 and T3 make up a current switch with the current mirror formed by T2 and T6. R6 and R7 create the phase splitter with T5 needed to provide in-phase and out-of-phase levels so that the output stage operates in a push-pull mode. T7 and T9 form a Darlington pair which supplies the large currents needed for fast rise times when VO is heavily loaded. Such a receiver can drive a wide range of capacitive loads with little variation in circuit delay.

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Active Pull-Up Receiver

The disclosed circuit employs an active pull-up output stage to provide better current drive for large capacitive loading. Referring to the schematic, T1 and T3 make up a current switch with the current mirror formed by T2 and T6. R6 and R7 create the phase splitter with T5 needed to provide in-phase and out-of-phase levels so that the output stage operates in a push-pull mode. T7 and T9 form a Darlington pair which supplies the large currents needed for fast rise times when VO is heavily loaded. Such a receiver can drive a wide range of capacitive loads with little variation in circuit delay.

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