Transceiver Timing Control Module for Signal Delay Calibration
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Solution Overview
Problem
In transceivers, signal distortion and noise are increased due to non-ideal transmission delays, which reduce the dynamic range of analog-to-digital converters, making it difficult to effectively cancel echo signals and reduce noise in the input signal.
Innovation Solution
A transceiver is designed with a timing control module that adjusts the transmission delays of both the transmitting signal and the echo cancellation signal during a calibration mode, using a digital-to-analog converter, a time-to-digital converter, and a controller to generate timing control signals that synchronize the echo and echo cancellation signals, thereby reducing timing errors and noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If transmission delay is not adjusted, then device complexity is reduced, but signal distortion and noise increase
Solution Approach 1:
The patent applies preliminary action by performing delay calibration before normal operation. The timing control module measures transmission delays of I and Q channels in advance, stores the delay values, and uses them during actual signal transmission to compensate for delay mismatches, thereby reducing signal distortion and noise without adding complex real-time adjustment mechanisms.
Solution Approach 2:
The transceiver performs self-calibration by using its own internal resources (timing control module, signal generators) to measure and compensate for its own delay mismatches. The system automatically adjusts its own timing parameters without requiring external calibration equipment, making the calibration process self-contained and eliminating the need for additional external devices.
2Measurement precision
If timing calibration is performed, then measurement precision of signal timing is improved, but device complexity increases
Solution Approach 1:
The timing control module is designed to perform multiple functions: generating test signals for calibration, measuring transmission delays of both I and Q channels, storing delay values, and applying timing compensation during normal operation. By consolidating these functions into a single multi-functional module, the patent achieves high measurement precision without proportionally increasing device complexity.
Solution Approach 2:
The patent merges the calibration function and operational function into a unified timing control module. The same module that controls signal timing during normal operation also performs delay measurement and compensation, eliminating the need for separate calibration hardware and reducing overall system complexity while maintaining measurement precision.
3Reliability
If transmission delay is adjusted, then dynamic range of analog-to-digital converter is improved, but ease of operation decreases
Solution Approach 1:
The system automatically performs timing calibration and delay compensation without requiring manual intervention. The timing control module autonomously measures delays, calculates compensation values, and adjusts timing parameters, making the operation simple and improving ease of use while maximizing the dynamic range of the analog-to-digital converter.
Solution Approach 2:
The timing control module uses feedback from delay measurements to automatically adjust transmission timing. By continuously monitoring and compensating for delay mismatches based on measured values, the system maintains optimal dynamic range without requiring manual tuning or complex operational procedures.
Data Source
AI summary
A transceiver includes a first digital-to-analog converter (DAC), a second DAC, and a timing control module. In a calibration mode, the first DAC transmits a transmitting signal; the second DAC transmits an echo cancellation signal; and the timing control module, according to an echo signal of the transmitting signal and the echo cancellation signal, obtains a timing offset therebetween, and generates a first timing control signal and a second timing control signal to the first DAC and the second DAC according to the timing offset, respectively. The first DAC adjusts a transmission delay of transmitting the transmitting signal according to the first timing control signal, and/or the second DAC modifies a transmission delay of transmitting the echo cancellation signal according to the second timing control signal.