Closed-Loop RF Phase Shifter for Precise Phase Control
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Solution Overview
Problem
Conventional RF phase shifters suffer from inaccuracies in phase control, resulting in errors of several degrees between the set phase and the output phase, making precise phase control difficult to achieve.
Innovation Solution
The RF phase shifter incorporates a phase detector to generate a phase difference voltage, which is processed by a processor to create a control voltage or digital control signal, adjusting the output phase to match the set phase accurately, using analog or digital methods.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional phase shifter control methods are used, then the device complexity is low, but the phase control precision deteriorates with errors of several degrees between set phase and output phase
Solution Approach 1:
The patent implements a feedback mechanism where a phase detector continuously monitors the output phase and compares it with the set phase, generating an error signal that is fed back to the processor. The processor adjusts the control voltage to minimize this error, thereby achieving high phase control precision through closed-loop control.
Solution Approach 2:
The patent replaces conventional mechanical or simple electrical phase control mechanisms with a sophisticated control system comprising a phase detector, processor, and feedback loop. This substitution uses electrical signal processing and computational control to achieve precise phase adjustment, overcoming the limitations of simpler mechanical approaches.
2Measurement precision
If fine phase shift control is implemented, then the phase control precision improves, but the reliability deteriorates due to unknown true value of output phase
Solution Approach 1:
The feedback mechanism continuously monitors the actual output phase using a phase detector and compares it with the intended set phase. This closed-loop control ensures that the true value of the output phase is constantly measured and corrected, thereby maintaining both high precision and reliability simultaneously.
Solution Approach 2:
The system performs self-correction by automatically detecting phase errors and adjusting its own control parameters through the processor. The phase detector and feedback loop enable the system to self-regulate and maintain accurate phase control without external intervention, ensuring both precision and reliability.
3Measurement precision
If accurate phase control is achieved through feedback mechanisms, then the phase control precision improves, but the device complexity increases due to additional components
Solution Approach 1:
The processor in the patent serves multiple functions: it processes the phase error signal from the phase detector, generates appropriate control voltages, and manages the overall phase control logic. This multi-functionality reduces the need for separate dedicated components for each function, thereby achieving high precision while limiting the increase in device complexity.
Solution Approach 2:
The patent combines the phase detection, error processing, and control signal generation functions into an integrated control system. The phase detector, processor, and control voltage generator work as a unified feedback loop, merging multiple functions into a cohesive system that achieves high precision without proportionally increasing complexity.
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
This approach enables highly accurate phase control, stabilizing the output phase for extended periods, even at high frequencies, by integrating the phase difference and feeding it back to adjust the phase shifter.
Implementation Method 1
a phase detector to generate a phase difference voltage according to a phase difference between the input RF signal and the output RF signal
Implementation Method 2
a processor to generate the control voltage according to a voltage difference between the phase difference voltage and a reference voltage according to the set phase
Implementation Method 3
a phase shifter to receive an input RF signal, generate an output RF signal in which a phase of the input RF signal is changed to a set phase according to a control voltage
Data Source
AI summary
An RF phase shifter includes a phase shifter to receive an input RF signal, generate an output RF signal in which a phase of the input RF signal is changed to a set phase in accordance with a control voltage, and output the output RF signal, a phase comparator to generate a phase difference voltage according to a phase difference between the input RF signal and the output RF signal, and a processor to generate a control voltage according to a voltage difference between the phase difference voltage and a reference voltage according to the set phase.