Compensation of baseline wander

Abstract

The present invention discloses a circuit for compensation of baseline voltage wander operating at an input of an isolator. The circuit can compensate electronically the frequency response of an isolation circuit (e.g., a transformer) by increasing the pass band in the low frequency region in order to minimize the baseline wander caused by low inductance windings. The compensation circuit can be used to inject a current ramp proportional to the amplitude and the duration of the pulse and inversely proportional to the open circuit inductance of the isolation circuit.

Description

Background technique [0001] Many communication systems exchange data using isolator circuits, such as transformers. For example, in Ethernet communication systems, the IEEE 802.3 (e.g., Institute of Electrical and Electronics Engineers 802.3-2012) standard specifies the provision of electrical isolation between Ethernet physical layer circuits (commonly referred to as "Ethernet PHYs") and Ethernet ports (eg, Media Dependent Interface (MDI)), which provides a physical and electrical connection to the wiring medium (eg, ANSI / TIA-568-C.0, General Telecommunications Cabling at Customer Premises, Category 5)). In this Ethernet implementation, a transformer can be used to transfer data from an Ethernet-enabled device onto the wiring medium. [0002] However, using transformers to transfer data between isolated systems or subsystems can introduce certain drawbacks. Baseline drift can occur, for example, when the voltage driven by a transformer drops over time, energy leaks away fro...

AI Technical Summary

Problems solved by technology

Applications and standards may require limiting this baseline drift

[0003] Existing methods of limiting baseline drift include the use of transformers with inductance values ​​that complicate or preclude the use of integrated transformer circuits

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