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AS1601 - World´s First Dual Channel Active EMI Suppressor for Ethernet Applications

The AS1601 is a single-chip, highly integrated CMOS solution for EMI (Electro-Magnetic Interference) Suppression in Ethernet applications. EMI Compliance is one of the most challenging aspects of system design that very often results in product release delays. The AS1601 is designed to address EMI Compliance issues in early phase of the system design and enables "Design for EMC (Electro-Magnetic Compatibility)" concept.

The AS1601 can be used in any type of 10Base-T/100Base-TX/1000Base-T systems, in both Power-over-Ethernet (POE) and non-POE ports. Applications include compliance to EMI Emissions (CISPR22 and FCC Part 15, Class B requirements for Radiated and Conducted Emissions) and EMI Immunity standards (IEC6100-4-3/6 requirements for Radiated and Conducted Immunity, Level 3 or higher). The AS1601 utilizes Akros Silicon's patented Active Choke technology that offers superior Common Mode (CM) noise reduction and CM immunity compared to passive filtering techniques in Ethernet applications. At the system level, the AS1601 provides additional CM noise suppression of more than 10dB over the entire Ethernet signal bandwidth.

The AS1601 works with standard Ethernet Physical Layer Transceivers (PHY) and Ethernet transformers. System designers can use the AS1601 to design systems for EMI compliance while maintaining full Ethernet electrical compliance per the IEEE 802.3 specification.

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  • Voice over IP (VoIP) Phones

  • IP Video security cameras

  • Wireless access points (WAP)

  • Set top boxes

  • Networked printers and appliances

  • Desktop and laptop computers

  • PoE and Non-PoE Ethernet systems



  • Enables system designers to comply with:

  • CISPR22 and FCC Part 15, Class B requirements for Radiated and Conducted Emissions.

  • IEC 61000-4-3/6 requirements for Radiated and Conducted Immunity, Level 3 or higher.

  • Provides up to 10dB of additional common mode noise suppression over the frequency of 1MHz to 125MHz when used with Ethernet magnetics.

  • Interfaces to standard Ethernet transformers and 10/100/ 1000Base-T Ethernet PHYs.

  • Uses a single standard power rail (3.3V or 2.5V).

  • Flow-through routing for ease of board layout.

  • Industrial temperature range (-40ºC to 85ºC).


Application Diagrams



Functional Description:


The AS1601ís adaptive CM noise suppression circuit provides very low common mode shunt impedance that absorbs the CM noise in both ingress and egress directions Ė increasing systemís immunity to CM noise coming from the UTP, and reducing emissions to the UTP. The level of CM suppression is hardware programmable and it compensates for many variables that are the source of CM noise in Ethernet systems. Integrity of the Ethernet signal is preserved by maintaining high differential impedance and low differential capacitive loading.

Each AS1601 supports two twisted pair interfaces. 10/100Base-T applications require one AS1601 device while 10/100/1000Base-T applications use two AS1601 devices. The AS1601 is available in a small footprint 16-pin QSOP, Reduction of Hazardous Substance (RoHS) compliant package.

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