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1. (WO2013153510) DIGITAL COMMUNICATION INTERFACE CIRCUIT FOR LINE-PAIR WITH INDIVIDUALLY ADJUSTABLE TRANSITION EDGES

Pub. No.:    WO/2013/153510    International Application No.:    PCT/IB2013/052818
Publication Date: Fri Oct 18 01:59:59 CEST 2013 International Filing Date: Wed Apr 10 01:59:59 CEST 2013
IPC: H03K 17/00
Applicants: KONINKLIJKE PHILIPS N.V.
Inventors: REZEANU, Stefan-Cristian
Title: DIGITAL COMMUNICATION INTERFACE CIRCUIT FOR LINE-PAIR WITH INDIVIDUALLY ADJUSTABLE TRANSITION EDGES
Abstract:
An interface circuit interfaces a device with a line-pair. The interface circuit includes: a diode bridge having polarity-independent input terminals coupled to the line-pair, and first and second output terminals having a positive polarity and a negative polarity, respectively; a first galvanic isolation device for outputting a receive signal received on the line-pair via the diode bridge; a second galvanic isolation device receiving a transmit signal; a voltage-controlled variable resistance element connected across the positive and negative output terminals of the diode bridge; and first and second filters cascaded between the second galvanic isolation device and the voltage-controlled variable resistance element. The first filter has decoupled charge and discharge paths so as to decouple the rise time and the fall time of the transmit signal. The second filter has a voltage-dependent frequency characteristic. The voltage-controlled variable resistance element couples the transmit signal to the line-pair via the diode bridge.