PAM Link Co-Calibration for Nonlinear Voltage Level Distortion

The patent implements a feedback mechanism where the receiving device measures distortion in received PAM-N signals and sends distortion information back to the transmitting device. The transmitting device then adjusts its drive strength parameters based on this feedback to minimize distortion. This closed-loop feedback system resolves the contradiction by enabling dynamic correction of non-linearity distortion while maintaining high data transmission capacity through multi-level PAM signaling.

The patent changes the drive strength parameters of the transmitting device based on measured distortion characteristics. By adjusting parameters such as voltage levels and timing offsets dynamically, the system optimizes signal quality while maintaining high-order PAM modulation for increased data capacity. This parameter adaptation resolves the contradiction between high productivity and distortion reduction.

The patent implements a self-service mechanism where the receiving device performs self-diagnosis by measuring distortion in received signals and automatically communicates correction information to the transmitting device. The transmitting device then self-adjusts its parameters without external intervention. This self-service approach improves reliability while minimizing the need for additional complex external calibration equipment.

The patent makes existing components multi-functional. The receiver interface circuit not only receives and decodes PAM-N signals but also measures distortion characteristics. The driver circuit not only transmits data signals but also adjusts its parameters based on distortion feedback. This multi-functionality reduces the need for separate dedicated calibration components, thereby improving reliability while limiting complexity increase.

The patent performs preliminary distortion measurement and parameter adjustment during the initialization phase of the communication link. By establishing optimal drive strength parameters before actual data transmission begins, the system achieves high voltage level uniformity without requiring continuous calibration during operation. This preliminary action resolves the contradiction by establishing precision upfront while maintaining operational simplicity.

The patent implements periodic distortion measurement and parameter adjustment rather than continuous calibration. The system periodically checks signal quality and makes necessary parameter adjustments at scheduled intervals, which maintains voltage level uniformity while minimizing the impact on ease of operation. This periodic approach balances manufacturing precision with operational simplicity.