Tunable Multi-Band Power Amplifier Matching for Handset Size Reduction
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Solution Overview
Problem
Current wireless handsets require multiple dedicated power amplifier circuits for different modes and frequency bands, leading to increased size, cost, and inefficiency due to the need for fixed matching networks that cannot optimize performance across multiple bands and modes simultaneously.
Innovation Solution
A tunable multi-mode and multi-band power amplifier module incorporating a power amplifier, envelope modulator, and tunable matching network (TMN) controlled by a controller, which adjusts bias settings and impedance elements to optimize output power and efficiency across various modes and bands.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple dedicated power amplifier circuits are used for different modes and bands, then performance optimization for each mode and band is improved, but device size and cost increase
Solution Approach 1:
The patent combines multiple dedicated power amplifier circuits into a single integrated power amplifier module that can operate across multiple modes and bands. The module includes a power amplifier, envelope modulator, and tunable matching network that work together to provide optimized performance for GSM, CDMA, and other wireless standards across multiple frequency bands, thereby reducing device size while maintaining performance optimization.
Solution Approach 2:
The power amplifier module is designed with universal functionality to support multiple wireless communication modes (GSM, CDMA, WCDMA) and frequency bands (800-2600 MHz). The tunable matching network can be configured through SPI control to adapt to different operating conditions, allowing a single module to replace multiple dedicated amplifiers while maintaining optimized performance for each mode and band.
2Reliability
If fixed matching networks are used for different bands and modes, then linearity and efficiency are optimized for specific modes, but adaptability across multiple modes and bands deteriorates
Solution Approach 1:
The patent implements a tunable matching network that dynamically adjusts its impedance characteristics based on the operating mode and frequency band. The matching network includes variable capacitors and inductors that can be controlled via SPI interface to change the circuit configuration, allowing the system to optimize linearity and efficiency for each specific mode (GSM, CDMA, WCDMA) and frequency band while maintaining adaptability across all supported modes and bands.
Solution Approach 2:
The matching network parameters (capacitance values, inductance values) are changed based on the desired operating mode and band. The controller modifies the electrical parameters of the matching network components to achieve optimal impedance matching for each communication standard and frequency range, thereby maintaining high linearity and efficiency across multiple modes and bands simultaneously.
3Area of stationary object
If a single power amplifier circuit is used to cover multiple bands, then device size is reduced, but performance optimization for specific bands deteriorates
Solution Approach 1:
The single power amplifier circuit incorporates a tunable matching network that dynamically reconfigures its impedance characteristics for each frequency band and mode of operation. Through SPI control, the matching network adjusts capacitor and inductor configurations to provide optimal matching for GSM 800/900, GSM 1800/1900, CDMA 800, and other bands, thereby maintaining performance optimization equivalent to multiple dedicated amplifiers while using a single circuit.
Solution Approach 2:
The system includes feedback mechanisms that monitor the operating mode and frequency band, then automatically adjust the matching network parameters to achieve optimal performance. The controller receives information about the current operating conditions and modifies the matching network configuration accordingly, ensuring that the single power amplifier circuit maintains optimized performance across all supported bands and modes.
Data Source
AI summary
An apparatus and method amplify a signal for use in a wireless network. The apparatus includes a power amplifier, an envelope modulator, a tunable matching network (TMN), and a controller. The power amplifier outputs the signal at an output power. The envelope modulator controls a bias setting for the power amplifier. The TMN includes a plurality of immittance elements. The controller is operably connected the envelope modulator and the TMN. The controller identifies a desired value for the output power of the power amplifier, controls the output power of the power amplifier by modifying the bias setting of the power amplifier, and sets a number of the plurality of immittance elements based on the bias setting of the power amplifier.