Patent ID: 9712368
Date: 2017-07-18
CPC Classifications: H04L

Claim:
1. An apparatus for performing chip-to-chip communications, comprising: a modulation circuit and a demodulation circuit based on differential current flow, for communicating between a transmitting chip and a receiving chip; said modulation circuit including a digital-to-analog converter and current mode mixer for each of a plurality of data bits and one or more track pulses, each of said plurality of data bits is converted from a digital signal to an analog differential current and mixed in said current mode mixer with analog differential current outputs for other data bits during multi-frequency modulation in which the differential current is modulated in response to applying a frequency carrier at each of multiple frequencies in different current mode mixers in each said modulation circuit; and said demodulation circuit including a current mode mixer and analog-to-digital converter for each of a plurality of data bits and one or more track pulses received from said modulation circuit, whereby a frequency carrier from said multiple frequencies is applied to each current mode mixer in said demodulation circuit to demodulate the analog differential carrier prior to conversion back to a digital signal through said analog-to-digital converter.