HSZ Consulting Ltd

Micro-electronic specialists in mixed-signal design & high speed communications


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Andre Szczepanek

Mike Harwood

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10BASE-T Ethernet PHYs

Mike designed all Analogue circuitry for the integrated 10BASE-T & AUI PHY on the ThunderLAN Ethernet Controllers. This circuitry was designed in a standard CMOS technology and included line-drivers with ‘wave-shaping’ to remove the need for  external filtering, ‘smart-squelch’ receivers, a low-jitter PLL, on-board crystal oscillator and auxiliary bias circuits. Mike also performed all laboratory device debug and compliance testing. This product was sold by Compaq under the brand name of ‘Netflex’ for over five years.


Mike also designed all Analogue circuitry for the discrete 10BASE-T/100BASE-TX PHY, and the Quad 10BASE-T PHY.

Top : Quad 10BASE-T PHY

Bottom Left : ThunderLAN 10/100 MAC with integrated 10BASE-T PHY

Bottom Right : Discrete 10BASE-T/100BASE-TX PHY

Left : Quad 10BASE-T PHY