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Servoloop Controlled High-Speed Data Driver

IP.com Disclosure Number: IPCOM000034222D
Original Publication Date: 1989-Jan-01
Included in the Prior Art Database: 2005-Jan-27

Publishing Venue

IBM

Related People

Authors:
Herz, AA Jones, RE Weber, EF [+details]

Abstract

The disclosed high-speed data driver uses a double-feedback circuit to eliminate large level shifts in output pulse amplitude and base line due to variations in temperature, thereby eliminating the need for manual or automatic periodic calibration in the testing sequence. The servoloop driver circuit shown in Fig. 1 minimizes temperature-induced level shifts by providing output pulse amplitudes and base lines which track the respective control inputs within three millivolts. Transistors T2 and T3, which switch alternately, form a differential current switch fed by the current source transistor T1. (Image Omitted) Resistors R1 and R2 are 50 ohm source terminators for the high speed data outputs 1 and 2.