Microwave Sensing Circuitry With DC Component Removal
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Solution Overview
Problem
Microwave sensing devices suffer from reduced accuracy due to noise and interference, such as low-frequency flicker noise and direct current components in the received signal, which degrade their performance.
Innovation Solution
The device employs a series of circuits to process and filter signals, including a generation circuit, processing circuits, transferring circuits, and a removing circuit to eliminate direct current components, thereby improving signal quality and accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the microwave sensing device receives signals directly without preprocessing, then the device structure remains simple, but the sensing accuracy deteriorates due to noise and interference
Solution Approach 1:
The signal processing function is segmented into multiple independent circuits: generation circuit for creating the transmission signal, first processing circuit for preprocessing, receiving circuit for signal acquisition, second processing circuit for further processing, and removing circuit for DC component elimination. Each circuit handles a specific aspect of signal processing, improving sensing accuracy while keeping individual circuit modules relatively simple.
Solution Approach 2:
The generation circuit and first processing circuit perform preliminary signal preparation before transmission. The DC component removal is performed preliminarily in the signal processing chain before final sensing analysis, preventing DC interference from affecting subsequent measurement stages.
2Measurement precision
If multiple processing circuits are added to improve signal quality, then sensing accuracy improves, but device complexity increases
Solution Approach 1:
The processing circuits are designed to perform multiple functions within a unified architecture. The generation circuit not only creates the transmission signal but also serves as a reference for the receiving circuit. The removing circuit handles DC component elimination that benefits multiple sensing operations, reducing overall system complexity despite multiple processing stages.
3Measurement precision
If DC component removal is implemented, then the signal-to-noise ratio improves, but the processing time increases
Solution Approach 1:
The DC component removal is performed preliminarily in the signal processing chain before final sensing analysis. By eliminating DC interference early through the dedicated removing circuit, subsequent processing stages work with cleaner signals, reducing the time required for noise filtering and signal analysis in later stages.
Data Source
AI summary
A microwave sensing device includes: a generation circuit, for generating a generation signal; a first processing circuit, for processing the generation signal, to generate a first processed signal; a transmitting circuit, for transmitting the first processed signal; a receiving circuit, for receiving a received signal corresponding to the first processed signal; a second processing circuit, for processing the received signal, to generate a second processed signal; a first transferring circuit, for transferring the second processed signal to a first transferred signal; a removing circuit, for removing a direct current (DC) component of the first transferred signal, to generate a removed signal; a third processing circuit, for processing the removed signal, to generate a third processed signal; and a second transferring circuit, for transferring the third processed signal to a second transferred signal.