Clocked Envelope Detection for Peak Sampling in Receivers
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Solution Overview
Problem
Super-regenerative receivers face challenges in accurately detecting the peak value of an envelope signal due to misalignment between the sampling timing of the analog-to-digital converter and the oscillation signal, leading to sensitivity degradation and increased calculation complexity.
Innovation Solution
A clocked envelope detector is introduced, synchronized with the oscillator and analog-to-digital converter, which holds the peak value of the envelope signal during a preset time interval using a clock signal, minimizing sensitivity degradation and calculation complexity by adjusting the sampling timing through a delay element and utilizing a resistor-capacitor charging circuit.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the sampling timing of the ADC is not aligned with the peak value of the envelope signal, then the receiver can be implemented with simple circuitry, but the detection accuracy of the peak value deteriorates
Solution Approach 1:
The patent applies preliminary action by using the clocked envelope detector to predict and hold the peak value of the envelope signal before the ADC sampling occurs. The detector anticipates the peak value timing and maintains it during the sampling interval, ensuring accurate detection without requiring complex timing alignment circuits.
Solution Approach 2:
The clocked envelope detector serves as an intermediary component between the oscillator and the ADC. It processes the envelope signal and holds the peak value, acting as a buffer that simplifies the ADC's sampling requirements while maintaining detection accuracy.
2Reliability
If the sampling timing is misaligned with the oscillation signal, then the receiver structure can be simplified, but the sensitivity of the receiver deteriorates
Solution Approach 1:
The clocked envelope detector performs preliminary detection and holding of the peak value, ensuring that the maximum amplitude is captured and maintained for the ADC sampling. This preliminary action preserves receiver sensitivity without requiring complex synchronized sampling structures.
3Measurement precision
If additional external elements like temperature-compensated oscillators are added to improve timing alignment, then the sampling accuracy improves, but the device complexity and cost increase
Solution Approach 1:
The system uses its existing clock signal to control the envelope detector's holding function, making the clock signal serve dual purposes: oscillation control and sampling synchronization. This self-service approach eliminates the need for external temperature-compensated oscillators while maintaining sampling accuracy.
Solution Approach 2:
The clock signal is given multiple functions: it controls the oscillator and simultaneously controls the envelope detector's holding operation. This multi-functionality reduces the need for separate timing control circuits and external compensation elements.
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
The clocked envelope detector effectively aligns the sampling timing with the peak value, enhancing the accuracy of peak detection and reducing sensitivity degradation caused by temperature variations and aging, while minimizing the need for additional external elements like temperature-compensated oscillators.
Implementation Method 1
a resistor-capacitor (RC) charging circuit comprising a resistor and a capacitor
Implementation Method 2
The clocked ED may include a switch and a resistor-capacitor (RC) charging circuit comprising a resistor and a capacitor
Data Source
AI summary
Provided is a receiver including an oscillator (OSC) configured to generate an oscillation signal based on a radio signal, a clocked envelope detector (ED) configured to detect an envelope of the oscillation signal and hold a peak value of the envelope during a time interval, and an analog-to-digital converter (ADC) configured to convert the peak value of the envelope into a digital signal.