Adjustable Sampling Clock in Transceivers for Interference Avoidance
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Solution Overview
Problem
Conventional transceivers face interference issues due to NEXT and ECHO signals, leading to error sampling when generating analog signals, as they often omit parts of the signal to process only what the Rx ADC can handle, potentially misaligning the signal position.
Innovation Solution
A transceiver mechanism that includes an adjustable delay circuit and multi-phase clock signal generator to adjust sampling points, allowing for optimal sampling by delaying clock signals and providing feedback to ensure accurate signal processing, thereby minimizing interference effects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the Rx ADC samples the transition part of the interference signal, then the interference effect increases causing error sampling, but if sampling points are fixed without adjustment, then the system complexity is low
Solution Approach 1:
The patent implements dynamic sampling point adjustment by introducing an adjustable delay circuit that can shift the sampling timing based on detected interference conditions. The sampling point is no longer fixed but dynamically adapted to avoid interference signal transitions, thereby improving sampling accuracy without requiring complete system redesign
Solution Approach 2:
The patent employs a feedback mechanism where the system detects interference signals and uses this information to adjust the sampling point timing. The delay circuit is controlled by feedback from interference detection, creating a closed-loop system that automatically optimizes sampling accuracy by avoiding harmful interference periods
2Adaptability or versatility
If part of the analog signal is omitted to fall within Rx ADC processing scope, then the signal can be processed, but the signal position cannot be located correctly causing errors
Solution Approach 1:
The patent applies preliminary action by adjusting the sampling point timing before the actual sampling occurs. The delay circuit pre-adjusts the sampling phase to align with the correct signal portions, ensuring that when sampling happens, the ADC captures the intended signal data at the correct positions without misalignment errors
3Reliability
If the transceiver uses fixed sampling points, then the device complexity is low, but sampling errors occur due to interference signal transitions
Solution Approach 1:
The patent transforms the static sampling point into a dynamic one by introducing an adjustable delay circuit. This circuit can shift the sampling timing dynamically based on interference conditions, making the sampling system adaptive rather than fixed, thereby improving reliability while accepting moderate increases in circuit complexity
Solution Approach 2:
The patent changes the timing parameter of the sampling operation by adjusting the delay circuit's delay value. This parameter adjustment allows the sampling point to be shifted in time to avoid interference signal transitions, improving sampling reliability through parameter optimization rather than fundamental system changes
Data Source
AI summary
A transceiver includes: a first DAC, for receiving a first digital signal to generate an analog signal; an operation circuit, coupled to the first DAC, for receiving the analog signal and a feedback signal to generate an operated analog signal; an ADC, for generating a second digital signal according to the operated analog signal; a digital signal processing circuit, for processing the second digital signal to generate a processed digital signal; a second DAC, for generating the feedback signal according to the processed digital signal; an adjustable delay circuit, for delaying a clock signal according to a control signal to adjust at least one sampling point of at least one of the first DAC, the second DAC and the ADC; and a control circuit, for generating the control signal according to the processed digital signal.