Polar Modulator Timing Mismatch Detection Using Internal Test Signals
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Solution Overview
Problem
Polar modulators experience signal propagation time mismatches due to different data processing delays in their amplitude and phase signal processing paths, which can affect transmit performance and require accurate alignment without the need for additional expensive circuitry.
Innovation Solution
A circuit and method are introduced to determine amplitude and phase signal propagation time mismatches by using a test signal generation circuit and analyzing circuit coupled to both signal paths, allowing for precise adjustment of delay elements to synchronize the signals, utilizing a predetermined signal shape and expected amplitude values to calculate mismatches.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If artificial delay stages are inserted into the amplitude or phase signal processing paths to align signal propagation times, then signal propagation time alignment is improved, but device complexity and cost increase due to additional circuitry
Solution Approach 1:
The system uses the existing high-performance receiver within the polar modulator to perform self-diagnosis and measurement of signal propagation time mismatches. The receiver processes test signals through the same amplitude and phase paths, allowing the system to automatically determine delay differences without external measurement equipment. This self-service approach eliminates the need for additional expensive test circuitry while maintaining measurement accuracy.
Solution Approach 2:
The high-performance receiver is utilized for dual purposes: its primary function of receiving and demodulating actual communication signals, and its secondary function of measuring signal propagation time mismatches by processing test signals. This multi-functionality allows the system to perform delay measurements without adding dedicated measurement hardware, thereby reducing overall device complexity while achieving precise alignment capability.
2Measurement precision
If external measurement setups or high-performance receivers are used to determine signal propagation time mismatches, then measurement accuracy is improved, but device complexity and cost increase
Solution Approach 1:
The system employs the existing high-performance receiver to perform self-measurement of signal propagation time mismatches. By injecting test signals and having the receiver process them through the amplitude and phase paths, the system automatically determines delay differences using its own internal resources. This eliminates the need for external measurement setups while maintaining high measurement precision.
Solution Approach 2:
Test signals serve as intermediaries to enable the high-performance receiver to measure signal propagation time mismatches. These test signals are injected into the amplitude and phase paths, allowing the receiver to compare arrival times and calculate delay differences without requiring external measurement equipment. The test signals facilitate the measurement process while being processed entirely within the existing system architecture.
Data Source
AI summary
A method for determining a signal propagation time mismatch in a modulator comprises generating a predetermined signal shape of a amplitude component of a radio frequency signal generating one or more predetermined conditions in a frequency component of the radio frequency signal at a first time interval relative to the predetermined signal shape and detecting the one or more predetermined conditions in the frequency component at a second time interval. The method further includes determining the amplitude component at the second time interval and calculating a signal propagation time mismatch value based on the signal shape of the amplitude component, on the first time interval and the second time interval.