Low-Power Phase Detector With Delay Compensation
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Solution Overview
Problem
Conventional phase detection circuitry requires high power consumption to achieve accurate phase measurement, which is a limitation in low power applications such as mobile devices, due to the need for wide bandwidth amplification channels to minimize amplitude dispersion and resulting phase errors.
Innovation Solution
The proposed solution involves a phase detector design that uses a combination of amplification channels with controlled delay elements and choppers to reduce the bandwidth requirements, allowing for accurate phase measurement while minimizing power consumption by introducing phase shifts and using correction factors based on the amplitude ratio of input signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If wide bandwidth amplification channels are used to minimize amplitude dispersion and phase errors, then phase measurement accuracy is improved, but power consumption increases
Solution Approach 1:
The patent applies preliminary action by introducing controlled delay elements before the phase detection stage. These delay elements pre-adjust the signal timing to compensate for expected amplitude dispersion, thereby reducing the bandwidth requirements of subsequent amplification stages while maintaining phase measurement accuracy. This allows the system to achieve accurate phase detection with lower power consumption by preparing signals in advance rather than requiring high bandwidth throughout the entire signal path.
Solution Approach 2:
The patent employs parameter changes by dynamically adjusting delay values and amplification gains based on signal characteristics. By changing these parameters adaptively, the system optimizes the trade-off between bandwidth requirements and power consumption while maintaining accurate phase measurement. The delay elements can be tuned to provide just enough compensation without requiring excessive bandwidth, thus reducing power usage while preserving measurement precision.
2Measurement precision
If amplification stages with high gain are used to ensure sufficient input voltages to the multiplier, then phase detection accuracy is improved, but amplitude dispersion increases causing phase errors
Solution Approach 1:
The patent introduces delay elements as intermediary components between the input signals and the amplification stages. These intermediaries pre-synchronize the signals by introducing controlled delays that compensate for upcoming amplitude dispersion. By placing these intermediaries in the signal path before amplification, the system can use moderate gain stages without suffering from severe phase errors, thus maintaining detection accuracy while reducing amplitude dispersion effects.
Solution Approach 2:
The delay elements perform preliminary synchronization of the input signals before they enter the amplification stages. This preliminary action ensures that signals are properly aligned in time, preventing amplitude dispersion from causing significant phase errors during subsequent amplification. This approach allows the system to achieve accurate phase detection without requiring extremely high gain stages that would exacerbate amplitude dispersion.
3Use of energy by moving object
If the bandwidth of amplification stages is reduced to 2× to 4× the input frequency to save power, then power consumption decreases, but phase measurement accuracy deteriorates due to increased amplitude dispersion
Solution Approach 1:
The patent applies preliminary anti-action by introducing delay elements that preemptively counteract the amplitude dispersion that would otherwise occur in low-bandwidth amplification stages. These delay elements are configured to compensate for the expected phase errors caused by reduced bandwidth, thereby allowing the system to operate with low power consumption while maintaining phase measurement accuracy. The preliminary anti-action effectively cancels out the negative effects of bandwidth reduction before they can degrade measurement precision.
Data Source
AI summary
A phase detection system for providing a phase signal indicative of a phase difference between first and second input signals, with the system including a pair of amplification channels for receiving the input signals, with each channel including a plurality of amplifier stages. The outputs of the two amplification channels are connected to the inputs of a multiplier arrangement, with the arrangement producing an uncompensated phase signal. Compensation circuitry is provided to receive a magnitude signal indicative of the relative magnitudes of the two input signals, with the magnitude signal being used to produce a corrected phase signal indicative of the phase difference between the two input signals.