RF Equalizer with Switched LC Network for Signal Power Flatness
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Solution Overview
Problem
Mobile communications devices experience unflatness in output RF signal power due to electronic characteristics, leading to fluctuations across different frequency bands, which existing RF equalizers fail to adequately compensate for.
Innovation Solution
A communications apparatus comprising an RF transceiver, an adjustable RF equalizer, a power amplifier, and a duplexer, where the RF equalizer adjusts its frequency response based on a control signal generated by a power detector to equalize RF signals, comprising resistors, capacitors, inductors, and switches that selectively couple components to compensate for signal power fluctuations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a fixed RF equalizer is used, then the device structure is simple, but it cannot compensate for unflatness of output RF signal power across different frequency bands
Solution Approach 1:
The patent implements a dynamic RF equalizer where the frequency response can be adjusted in response to control signals. The equalizer includes adjustable components (such as variable capacitors or switched capacitor networks) that allow the equalization characteristics to change dynamically based on the operating frequency band and detected signal conditions, enabling effective compensation across multiple frequency bands while maintaining manageable structural complexity through modular design
2Reliability
If the RF equalizer frequency response is made adjustable, then compensation for unflatness is improved, but the device complexity increases
Solution Approach 1:
The patent incorporates a feedback mechanism where a power detector monitors the output RF signal power and generates control signals based on the detected power levels. These control signals are fed back to the RF equalizer to adjust its frequency response, creating a closed-loop system that automatically compensates for unflatness. The feedback approach enables adaptive equalization that responds to actual signal conditions, improving compensation effectiveness while managing complexity through automated control
Solution Approach 2:
The patent changes the parameters of the RF equalizer (such as capacitance values or impedance ratios) in response to control signals to optimize compensation performance. By dynamically adjusting these parameters based on detected signal characteristics and operating frequency bands, the equalizer adapts its behavior to achieve optimal signal power flatness across different communication standards and frequency ranges
Data Source
AI summary
A radio frequency equalizer includes a first resistor coupled to an input terminal, a second resistor coupled between the first resistor and an output terminal, a first capacitor, a first inductor, a first switch coupled to the input terminal, the first capacitor and the first inductor, a second switch coupled to the output terminal, the first capacitor and the first inductor, a second capacitor, a second inductor and a third switch coupled to the first resistor, the second resistor, the second capacitor and the second inductor. According to a control signal, the first switch selectively couples the first capacitor or the first inductor to the input terminal, the second switch selectively couples the first capacitor or the first inductor to the output terminal and the third switch selectively couples the second capacitor or the second inductor to the first resistor and the second resistor.