Spread Spectrum Modulator for Wireless Signal EMI Reduction
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Solution Overview
Problem
Wireless signal receiving devices face challenges in minimizing electromagnetic interference (EMI) due to high-frequency noise when processing and transmitting large amounts of data in limited spaces, such as printed circuit boards (PCBs), leading to increased device size and potential interference with external electronic devices.
Innovation Solution
Incorporating an RF tuner to receive wireless signals, a demodulator to output signals in a first frequency band, and a spread spectrum modulator to expand the frequency spectrum to a second band, allowing for efficient data processing and transmission while minimizing EMI by spreading the frequency spectrum using low voltage differential signaling (LVDS) signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If high-frequency signals are used for fast data processing in limited PCB space, then data processing speed is improved, but electromagnetic interference is generated
Solution Approach 1:
The patent changes the frequency parameter of the signal by using a spread spectrum modulator to convert high-frequency signals to lower frequency ranges. This allows fast data processing to continue while the generated electromagnetic interference is reduced to acceptable levels, directly resolving the contradiction between processing speed and EMI generation
Solution Approach 2:
The patent converts the harmful high-frequency electromagnetic interference into beneficial low-frequency signals through spread spectrum modulation. The energy that would otherwise cause EMI is transformed into useful data transmission signals at frequencies that do not interfere with other electronic devices, turning a harmful effect into a beneficial one
2Productivity
If device size is increased to accommodate signal processing configurations, then signal processing capability is improved, but device compactness deteriorates
Solution Approach 1:
The patent combines multiple signal processing functions (RF tuning, demodulation, spread spectrum modulation) into a single integrated signal processing unit. This merging of functions allows comprehensive signal processing capability to be achieved within a compact form factor, resolving the contradiction between processing capability and device size
Data Source
AI summary
A wireless signal receiving device is disclosed that includes an RF tuner for receiving a wireless signal over an antenna radiator, a demodulator for demodulating the received signal to output a signal of a first frequency band, and a spread spectrum modulator for spreading a frequency spectrum of the demodulated signal to output a signal of a second frequency band. In addition, various embodiments recognized through the specification are possible.