RF Power Amplifier Detection Circuit for Multi-Mode Power Control
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Solution Overview
Problem
Current radio-frequency power amplifier modules in multi-mode and multi-band communication devices require different detection methods for various communication modes, leading to increased size and circuit complexity due to the need for separate power detection circuits, which complicates power control and calibration.
Innovation Solution
A semiconductor integrated circuit apparatus and radio-frequency power amplifier module that incorporates multiple detection methods, such as log detection and log-linear detection, within a small area using a configuration of amplifier circuits, detection circuits, adder circuits, multiplier circuits, and current-voltage conversion circuits, allowing for flexible detection modes and optimized characteristics through coefficient adjustment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If separate power detection circuits are used for different communication modes, then detection accuracy for each mode is improved, but device complexity and circuit area increase
Solution Approach 1:
The patent implements a universal power detection circuit that can operate in multiple detection modes (log detection and log-linear detection) through configuration selection. The same physical circuit hardware supports different communication modes (GSM, EDGE, W-CDMA) by switching between detection methods, eliminating the need for separate dedicated circuits for each mode while maintaining detection accuracy requirements.
Solution Approach 2:
The patent introduces dynamic switching capability between different detection methods based on communication mode requirements. The circuit can dynamically select between log detection and log-linear detection modes, and can also dynamically adjust detection ranges and gain settings to adapt to different power levels and communication standards, optimizing performance without increasing hardware complexity.
2Measurement precision
If separate power detection circuits are used for different communication modes, then detection accuracy for each mode is improved, but the size of the module increases
Solution Approach 1:
The patent implements a universal power detection circuit that can operate in multiple detection modes (log detection and log-linear detection) through configuration selection. The same physical circuit hardware supports different communication modes (GSM, EDGE, W-CDMA) by switching between detection methods, eliminating the need for separate dedicated circuits for each mode while maintaining detection accuracy requirements.
Solution Approach 2:
The patent merges multiple detection functions into a single integrated circuit block. By combining log detection and log-linear detection capabilities within one circuit structure, and by integrating the detection circuit with the power amplifier module, the design reduces overall module size while maintaining the ability to provide accurate detection for different communication modes.
3Measurement precision
If multiple detection methods are implemented separately, then detection characteristics can be optimized for each mode, but circuit area increases
Solution Approach 1:
The patent introduces dynamic switching capability between different detection methods based on communication mode requirements. The circuit can dynamically select between log detection and log-linear detection modes, and can also dynamically adjust detection ranges and gain settings to adapt to different power levels and communication standards, optimizing performance without increasing hardware complexity.
Solution Approach 2:
The patent optimizes detection characteristics by changing operational parameters rather than hardware structure. By adjusting detection range settings, gain values, and switching between detection algorithms based on communication mode, the circuit achieves optimized detection characteristics for each mode while using the same physical hardware, thereby avoiding area increase.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables efficient power control and reduced variation in output power across different communication modes by realizing multiple detection methods in a compact form, optimizing detection characteristics and reducing circuit area, thus enhancing the stability and precision of power amplification.
Implementation Method 1
a directional coupler that generates a detected power signal (Pdet) using electromagnetic field coupling with Pout
Data Source
AI summary
In a semiconductor integrated circuit apparatus and a radio-frequency power amplifier module, a log detection portion including multiple-stage amplifier circuits, multiple level detection circuits, adder circuits, and a linear detection portion including a level detection circuit are provided. Output current from the log detection portion and output current from the linear detection portion are multiplied by different coefficients and the results of the multiplication are added to each other to realize the multiple detection methods. For example, current resulting from multiplication of the output current from the log detection portion by ×6/5 is added to the output current from the linear detection portion to realize a log detection method and, current resulting from multiplication of the output current from the log detection portion by ×⅕ is added to current resulting from multiplication of the output current from the linear detection portion by ×3 to realize a log-linear detection method.