Integrated CDR Processor Control for Adaptive Signal Recovery
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Solution Overview
Problem
Conventional clock and data recovery (CDR) circuits have rigid state machines that do not adapt well to changing conditions, often formed separately from the CDR circuit and coupled using printed circuit boards, limiting their flexibility and efficiency.
Innovation Solution
A system with a clock and data recovery circuit and a digital control circuit formed on a single substrate, where the digital control circuit, potentially including a processor, adaptsively controls the CDR circuit using data from the CDR circuit, optimizing parameters like power consumption and signal integrity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the state machine is formed separately from the CDR circuit and coupled using a printed circuit board, then the CDR circuit can be implemented with dedicated control logic, but the flexibility and adaptability of the system is reduced
Solution Approach 1:
The patent combines the state machine and CDR circuit onto a single substrate, eliminating the need for separate PCB coupling. This integration allows the system to maintain reliable control logic while simultaneously improving adaptability, as the processor can dynamically adjust CDR operations based on real-time conditions without being constrained by rigid hardware state machines.
Solution Approach 2:
The patent transitions from a static, rigid state machine to a dynamic processor-based control system. The processor can adaptively modify CDR circuit operations in real-time based on changing signal conditions, data rates, and system requirements, providing the flexibility and adaptability that fixed hardware state machines cannot achieve.
2Device complexity
If the state machine provides a rigid structure, then the control logic is simple and predictable, but the CDR circuit cannot adapt to changing circumstances
Solution Approach 1:
The patent replaces the mechanical/hardware-based state machine with a software/firmware-based processor control system. This substitution allows the system to maintain simple and predictable control logic through structured programming while simultaneously achieving adaptability through software flexibility, enabling dynamic response to changing circumstances without hardware reconfiguration.
Solution Approach 2:
The patent enables dynamic parameter adjustment of the CDR circuit through processor control. Instead of being constrained by fixed hardware parameters, the system can modify operating parameters such as loop filter coefficients, charge pump currents, and VCO frequencies in real-time based on signal conditions, thereby achieving adaptability while maintaining controlled complexity through software management.
3Ease of manufacture
If multiple components are formed on separate substrates, then each component can be optimized independently, but the overall system efficiency and performance is reduced
Solution Approach 1:
The patent integrates multiple CDR components (phase detector, charge pump, VCO, loop filter) onto a single substrate with the control processor. This merging eliminates the performance degradation caused by inter-substrate signal transmission delays and impedance mismatches, thereby improving system efficiency and productivity while maintaining manufacturing feasibility through standard integrated circuit fabrication processes.
Data Source
AI summary
A system may include a clock and data recovery circuit that includes one or more analog components. The system may also include a digital control circuit configured to control the clock and data recovery circuit. The digital control circuit and the clock and data recovery circuit may be formed on a single substrate.