Precision Phase Generator With Feedback-Tuned Delay Control
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing phase generation technologies face challenges in producing signals that are precisely offset in phase due to component tolerance and noise, making it difficult to achieve desired phase separation in applications like quadrature modulators and phase rotators.
Innovation Solution
A precision phase generator comprising a variable delay element, logic element, comparator, and reference signal generator that adjusts the delay based on a control signal to accurately produce phase-separated signals, such as quadrature signals, by using a logic gate like an XOR gate and a comparator to minimize phase difference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional phase generation circuitry is used, then signal generation is simple, but phase separation precision deteriorates due to component tolerance and noise
Solution Approach 1:
The patent implements a feedback mechanism where the generated phase-separated signals are fed back to a phase detector that compares the actual phase difference against a target value. The error signal from this comparison adjusts the delay element to correct phase deviations, thereby achieving precise phase separation despite component tolerances and noise in the circuitry.
Solution Approach 2:
The patent employs a dynamically adjustable delay element whose delay amount can be modified in real-time based on feedback from the phase detector. This dynamic adjustment allows the system to compensate for variations and maintain precise phase separation, transforming a static circuit into an adaptive system that actively corrects phase errors.
2Manufacturing precision
If fixed delay elements are used, then device complexity is reduced, but phase separation accuracy deteriorates due to inability to compensate for tolerance variations
Solution Approach 1:
The delay element is designed to be dynamically adjustable rather than fixed, allowing its delay characteristic to be modified under control based on feedback from the phase detector. This enables the system to compensate for manufacturing tolerances and achieve accurate phase offsets despite variations in the delay element's initial characteristics.
Solution Approach 2:
The system implements self-correction where the phase detector monitors the actual phase separation and automatically adjusts the delay element to maintain the desired phase relationship. This self-service mechanism eliminates the need for manual calibration and compensates for tolerance variations automatically during operation.
Data Source
AI summary
A phase generator includes a delay element configured to receive an input signal and delay the input signal by a predetermined amount to develop a delayed version of the input signal, a logic element configured to receive the input signal and the delayed version of the input signal, the logic element configured to produce a signal dependent on a phase difference between the input signal and the delayed version of the input signal, a circuit configured to generate a reference signal, and a comparator configured to receive an output of the logic element and the reference signal. The comparator is configured to generate a control signal that is dependent on the difference between the output of the logic element and the reference signal, where the control signal is applied to the delay element to determine the delay applied to the input signal.