Comparator-Filter Envelope Detection for Precise ASK Demodulation
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Solution Overview
Problem
Existing envelope detectors face challenges in achieving low costs, high processing precision, and high processing rates, with low-cost detectors having low precision and complex, high-cost detectors having high precision and rate.
Innovation Solution
An envelope detector is designed with a comparator circuit and a filter circuit, combined with an anti-common-mode interference circuit, to process analog signals with high precision and rate while maintaining low costs, using components like equivalent resistors and capacitors to filter common-mode interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a low-cost envelope detector is used, then the cost is reduced, but the processing precision and processing rate become low
Solution Approach 1:
The envelope detector is segmented into two independent functional modules: a comparator circuit for high-speed comparison operations and a filter circuit for precision envelope extraction. This segmentation allows each module to be optimized independently, enabling the system to achieve high processing precision and high processing rate while maintaining low cost through modular design
Solution Approach 2:
The comparator circuit serves as an intermediary component that processes the input signal before it reaches the filter circuit. By placing the comparator in this intermediate position, the system benefits from the high-speed comparison capability of the comparator while the filter circuit provides precise envelope detection, thus resolving the contradiction between cost and performance
2Ease of manufacture
If a low-cost envelope detector is used, then the cost is reduced, but the processing rate becomes low
Solution Approach 1:
The envelope detector is segmented into two independent functional modules: a comparator circuit for high-speed comparison operations and a filter circuit for precision envelope extraction. This segmentation allows each module to be optimized independently, enabling the system to achieve high processing precision and high processing rate while maintaining low cost through modular design
Solution Approach 2:
The comparator circuit continuously compares the input signal with a reference signal without interruption, maintaining a high processing rate. This continuous operation ensures that the system can handle high-frequency signals effectively while keeping the overall design simple and cost-effective
3Measurement precision
If an envelope detector with high processing precision and high processing rate is used, then the processing precision and rate are improved, but the structure becomes very complex and component costs become very high
Solution Approach 1:
The envelope detector is segmented into two independent functional modules: a comparator circuit for high-speed comparison operations and a filter circuit for precision envelope extraction. This segmentation allows each module to be optimized independently, enabling the system to achieve high processing precision and high processing rate while maintaining low cost through modular design
Solution Approach 2:
The invention uses simple, inexpensive comparator circuits and filter circuits instead of complex, expensive high-precision components. By accepting that these simple components have limitations, the design achieves cost-effectiveness while meeting performance requirements through proper circuit configuration and parameter selection
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 solution enables envelope detection with high precision and high processing rate at low costs, improving signal processing reliability and flexibility without increasing hardware complexity or costs.
Implementation Method 1
a voltage value of the first reference signal is determined based on an ASK modulation parameter and the like of the first analog signal received in an actual application scenario. The first reference signal and the first analog signal are input via the comparator circuit, and a value of the first reference signal and a value of the first analog signal are compared to obtain the first direct-current signal
Implementation Method 2
the first envelope signal is obtained through filtering on the first direct-current signal, and the first envelope signal may indicate values of a plurality of bits of the first data information carried in the first analog signal
Implementation Method 3
when the common-mode interference signal exists, impact of the common-mode interference signal on the comparator circuit can be eliminated via the anti-common-mode interference circuit
Data Source
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AI summary
Embodiments of this application provide an envelope detector, an amplitude demodulator, and an electronic device, and are applied to the field of electronic component signal processing technologies. The envelope detector includes a comparator circuit and a first filter circuit. An output end of the comparator circuit is coupled to an input end of the first filter circuit. A first input end of the comparator circuit is configured to be input with a first analog signal. A second input end of the comparator circuit is configured to be input with a first reference signal. The comparator circuit is configured to output a first direct-current signal based on the first analog signal and the first reference signal. A level of the first direct-current signal indicates a value relationship between the first analog signal and the first reference signal. The first filter circuit is configured to output a first envelope signal based on the first direct-current signal. A signal amplitude of the first envelope signal indicates a signal peak of the first direct-current signal. In embodiments of this application, envelope detection with low costs, high processing precision, and a high processing rate on the first analog signal is implemented.