Gearbox Retimer Clocking for Low-Latency ADC-DSP Interfaces

The patent divides the clocking system into separate domains: unit-ADCs operate at their optimal sampling clock frequency while the DSP operates at its own optimal frequency. The gearbox retimer acts as an intermediary that segments the clock synchronization function, allowing each component to operate independently at its optimal speed without being constrained to a unified clock domain.

The gearbox retimer serves as an intermediary device between the unit-ADCs and the DSP. It receives data from multiple unit-ADCs operating at different clock rates, performs retiming and alignment operations, and outputs synchronized data to the DSP. This mediator resolves the clock frequency mismatch without requiring the DSP to operate at the ADC sampling clock frequency, thereby reducing power consumption while maintaining interface functionality.

The patent segments the clock domains to allow unit-ADCs and DSP to operate at their respective optimal frequencies. The gearbox retimer divides the synchronization function into separate stages: data collection from interleaved ADCs, retiming operations, and output to DSP. This segmentation enables optimal CDR performance by allowing the DSP to operate at its optimal frequency rather than being forced to match the ADC sampling clock.

The gearbox retimer acts as an intermediary that bridges the clock domain gap between unit-ADCs and DSP. It performs critical functions including data alignment, retiming, and clock domain crossing, which are essential for maintaining high CDR performance. By introducing this intermediary layer, the system achieves optimal CDR performance without requiring the DSP to operate at the ADC sampling clock frequency.

The patent implements a dynamic retiming architecture where the gearbox retimer adaptively adjusts its operation based on the timing requirements of different unit-ADCs. The retimer dynamically aligns data from multiple interleaved ADCs that may have slight timing variations, using dynamic control logic to minimize latency. This dynamic approach allows the system to achieve low latency performance while maintaining a relatively straightforward architectural structure.

The gearbox retimer performs preliminary retiming and alignment operations on data from unit-ADCs before passing it to the DSP. By proactively correcting timing mismatches and aligning data in advance, the system reduces the overall data latency path. This preliminary action prevents latency accumulation that would occur if timing corrections were deferred to later stages in the signal processing chain.