PHASE SYNCHRONIZATION OF MODULATION OR DEMODULATION FOR QAM-BASED MULTIBAND TSV-LINK

摘要

A chip-to-chip communications circuit which is particularly well-suited for short range wired RF communication from one integrated circuit (chip) to another is presented. The circuits preferably utilize multi-frequency quadrature amplitude modulation (QAM) mechanisms for converting digital data bits from a parallel form into a serial analog stream for communication over a chip I/O connection. During a phase calibration cycle, a phase adjustment controller in the transmitter interoperates with a phase adjustment controller in the receiver, to adjust a phase locked-loop (PLL) circuit to correct for the phase delay arising in response to signal propagation between transmitter and receiver.

主权项

1. An apparatus for obtaining phase synchronization between modulation at a transmitter and demodulation at a receiver, comprising:
(a) a modulation circuit within a transmitter configured for modulating digital data into a multiple-frequency analog signal output; (b) a demodulation circuit within a receiver configured for demodulating the multiple-frequency analog signal from said transmitter back into digital data; (c) a transmission controller coupled to said modulation circuit for controlling a phase adjustment cycle between said transmitter and said receiver; and (d) a phase adjustment controller coupled for receiving outputs from said demodulation circuit and for controlling phase of a phase-locked loop circuit coupled to multiple-frequency mixers in said demodulation circuit; (e) wherein during a phase adjustment cycle, predefined signal patterns are sent by said transmission controller to said phase adjustment controller, from which an optimum phase adjustment is determined for said phase-locked loop circuit controlling demodulation mixers in said demodulation circuit.