Methods and apparatus to synchronize signals in energy efficient ethernet protocols

Abstract

Methods, apparatus, and systems to synchronize Ethernet signals are disclosed. An example apparatus includes slicer circuitry having an input coupled to interface circuitry and having an output, the slicer circuitry configured to receive an analog signal corresponding to a first Analog to Digital Converter (ADC) clock in a plurality of ADC clocks and operable to determine symbols based on the analog signal; logic circuitry to determine whether there is a symbol transition in the symbols; timing error detector circuitry to update an error value in response to the determination that there is a symbol transition; timing loop circuitry to determine a frequency of voltage oscillations based on at least the error value; and phase interpolator circuitry to change a plurality of phase parameters corresponding to the plurality of ADC clocks at a rate given by the frequency of voltage oscillations.