Switchable Power Detector for Multi-Band Transmit Control
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Solution Overview
Problem
Existing multi-mode communication devices face challenges in accurately monitoring and controlling transmit power levels when switching between different communication standards and frequency bands, leading to inadequate isolation, inaccurate results, increased power consumption, and disruptive crosstalk due to limitations in prior art solutions such as multi-band couplers and mismatched detectors.
Innovation Solution
A method and apparatus that selectively configures a detector to match the mode of operation by sending a switch control signal to connect a sampler to a detector, amplifying the outgoing signal, detecting its power level, and generating a feedback signal to adjust the amplifier control signal, allowing for dynamic power level control during transitions between modes or bands.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multi-band couplers are used to detect power level in different frequency bands, then the device can operate in multiple bands, but the isolation is inadequate and crosstalk increases
Solution Approach 1:
The detector is divided into multiple detector elements, each optimized for a specific frequency band. Instead of using a single multi-band coupler that handles all bands, the system segments the detection function across multiple specialized detector elements, reducing interference and improving isolation between bands.
Solution Approach 2:
A switch is introduced as an intermediary component that selectively connects the appropriate detector element to the amplifier output based on the active frequency band. This mediator ensures that only the detector element tuned to the current band is active, preventing crosstalk from other bands while maintaining multi-band operation capability.
2Measurement precision
If multiple detectors are used to cover different frequency bands, then each band can be monitored accurately, but the device complexity and manufacturing cost increase
Solution Approach 1:
Multiple detector elements are designed with identical structural configurations and are positioned at different locations relative to the amplifier output. This universal design allows for simplified manufacturing and testing, as each detector element can be produced using the same process. The switch provides the multi-functionality by routing signals from different bands to equivalent detector structures.
Solution Approach 2:
The detector elements are positioned at different distances or locations from the amplifier output, creating parameter variations in their operating conditions. This allows each detector to be optimized for its specific frequency band while maintaining a uniform structural design, simplifying manufacturing while achieving band-specific detection accuracy.
3Measurement precision
If detector elements are positioned at different locations to optimize band detection, then detection accuracy improves, but manufacturing precision requirements increase
Solution Approach 1:
The detection system is segmented into multiple detector elements with standardized designs. Each element is identical in structure but positioned at different locations optimized for specific frequency bands. This segmentation allows for modular manufacturing where each detector element can be produced and tested independently, then assembled as a unit, reducing the impact of positioning tolerances.
Data Source
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AI summary
A method and apparatus for power detection in a multi-mode communication device configured for operation in a different modes or frequyency bands. A detector (330) monitors the power level of an amplified outgoing signal. The detector (330) may be configured with a switch (412) and two or more samplers (404). Responsive to the mode of operation, the detector (404) adopts an optimal configuration to generate a power level feedback signal, which is provided to a digital signal processor or controller (304). Compariso of the power level feedback signal to a target value may occur to generate an amplifier signal. The amplifier control signal controls the gain, applied by an amplifier (308), to the outgoing signal. During operation, the system monitors for a change in the mode of operatio and upon responsive to a change, generates a switch control signal to reconfigure the detector configuration to match the new mode of operation.