Frequency-Error SSC Clocking for Low-Noise Transceiver Links
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Solution Overview
Problem
Existing semiconductor devices and communication systems cannot independently apply Spread Spectrum Clock (SSC) to transmit data based on frequency errors between receive data and operation clock signals, leading to limitations in reducing unwanted radiation noise.
Innovation Solution
A semiconductor device with a clock and data recovery unit, frequency error adjusting unit, frequency error storage unit, operation clock generation unit, and SSCG unit that allows optional application of SSC to transmit data by varying the operation clock signal based on stored frequency error signals, enabling SSC to be applied regardless of its application to receive data.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If SSC is applied to receive data, then unwanted radiation noise is reduced, but SSC cannot be independently applied to transmit data
Solution Approach 1:
The invention separates the SSC application control into independent parts: the transmit SSCG can be controlled independently from the receive SSCG through separate control signals (first control signal for transmit, second control signal for receive). This allows selective application of SSC to transmit data regardless of receive data SSC status, resolving the contradiction between noise reduction and independent control capability.
Solution Approach 2:
The invention introduces dynamic control mechanisms where the transmit SSCG responds to frequency error signals and can be independently enabled/disabled based on communication conditions. The system dynamically adjusts SSC application on the transmit side based on detected frequency errors and control signals, rather than passively following receive data SSC status.
2Reliability
If transmit clock signal is generated based on frequency error feedback, then communication synchronization is improved, but SSC application to transmit data is restricted
Solution Approach 1:
The invention divides the clock generation and SSC control functions into separate controllable modules. The transmit SSCG receives both the frequency error signal (for synchronization) and an independent control signal (for SSC application decision), allowing the system to maintain synchronization while independently controlling SSC application based on communication conditions.
Solution Approach 2:
The system changes the control parameters by introducing a separate control signal that independently governs SSC application to transmit data. This parameter change enables the transmit SSCG to operate in different modes (SSC enabled/disabled) based on communication conditions, while the frequency error feedback continues to ensure synchronization.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables the generation of a transmit clock signal based on frequency errors, allowing optional SSC application to transmit data, effectively reducing unwanted radiation noise and improving communication system performance.
Implementation Method 1
an SSCG unit which, based on the value of the frequency error signal stored in the frequency error signal storage unit, varies the operation clock signal generated by the operation clock generation unit by spreading the spectrum of the operation clock signal
Data Source
AI summary
A semiconductor device includes: a clock and data recovery unit to which a receive signal is inputted and which extracts, based on an operation clock signal, a clock signal and a data signal from the receive signal; a frequency error adjusting unit which generates a frequency error signal indicating a frequency error between the clock signal extracted from the receive signal and the operation clock signal; a frequency error signal storage unit which stores the frequency error signal; an operation clock generation unit which controls, based on the frequency error signal, a frequency of the operation clock signal; and an SSCG unit which, based on the value of the frequency error signal stored in the frequency error signal storage unit, varies the operation clock signal generated by the operation clock generation unit by spreading the spectrum of the operation clock signal.