Voltage Converter Switching Frequency Selection for Wireless Transceivers
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Solution Overview
Problem
Switch-mode converters in radios generate spurious signals that can desensitize receivers and degrade transmitted signals, particularly when switching frequencies are high, as these signals can fall within the wanted receive or transmit channels, causing interference and compliance issues with regulatory standards.
Innovation Solution
A wireless transceiver with a voltage converter operating at a single switching frequency, where all harmonics of this frequency fall outside the predefined receive and transmit channels, minimizing spurious signals by selecting frequencies that avoid harmonic interference within the channel bands.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If switch-mode converters operate at high switching frequencies, then conversion efficiency and response speed are improved, but spurious signal generation increases and can interfere with receive channels
Solution Approach 1:
The patent applies parameter changes by carefully selecting the switching frequency as a specific parameter. The switching frequency is chosen such that the fundamental frequency and all its harmonics fall outside the receive channel bandwidths, thereby maintaining high switching frequency benefits while avoiding spurious signal interference with receive channels.
2Volume of moving object
If switching frequency is increased, then converter size and cost are reduced, but spurious harmonics extend higher and are more likely to fall within wanted receive channels
Solution Approach 1:
The patent uses parameter changes by selecting a specific switching frequency value that optimizes both converter size and harmonic interference. By choosing a frequency where harmonics align with gaps between receive channels, the patent achieves compact converter design without sacrificing receiver performance.
Data Source
AI summary
Embodiments for at least one method and apparatus of a wireless transceiver are disclosed. For one embodiment, the wireless transceiver includes a transmit chain, wherein the transmit chain includes a power amplifier. The wireless transceiver additionally includes a receiver chain that is tunable to receive wireless signals over at least one of multiple channels, wherein the multiple channels are predefined. Further, the wireless transceiver includes a voltage converter. The voltage converter provides a supply voltage to the power amplifier, and operates at a single switching frequency, wherein the single switching frequency and all harmonics of the single switching frequency fall outside of the multiple channels.