Power Amplifier Cell Control for Constant Output Impedance
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Solution Overview
Problem
Existing power amplifiers in wireless communication systems face challenges in optimizing output impedance, leading to degraded performance due to separate elements required for load tuning, which affects efficiency and power output.
Innovation Solution
A power amplifier system with multiple power transistor cells, a power amplifier controller, and a voltage generator that adjusts power supply voltage based on power modes, allowing for selective turning on/off of transistor cells and varying bias voltage supply to maintain constant output impedance without a separate load tuning circuit.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a separate circuit is implemented to tune the load of the power amplifier, then the output impedance can be optimized, but the overall performance is degraded due to additional separate elements
Solution Approach 1:
The patent merges the load tuning function into the existing power amplifier structure by utilizing the gate control terminals of the power transistor cells. Instead of adding a separate load tuning circuit, the invention combines multiple functions (power amplification and load tuning) into a unified structure where the same control mechanism serves both purposes, thereby optimizing output impedance without increasing device complexity
Solution Approach 2:
The control terminals of the power transistor cells are designed to serve dual functions: controlling the power amplification operation and simultaneously performing load tuning. This multi-functional design allows the same elements to optimize output impedance while maintaining power amplification, eliminating the need for dedicated separate tuning elements and improving overall system efficiency
2Loss of energy
If multiple power transistor cells are used with selective turning on/off, then power efficiency is improved across different power modes, but control complexity increases
Solution Approach 1:
The patent implements dynamic control of multiple power transistor cells by adjusting the power supply voltage based on different power modes. The voltage generator dynamically changes the voltage level supplied to the control terminals, enabling selective activation of transistor cells according to the required power output level. This dynamic voltage adjustment mechanism allows efficient power management across different operating conditions without requiring complex individual switching controls for each cell
Solution Approach 2:
The invention changes the power supply voltage parameter to control the operation of multiple power transistor cells. By varying the voltage level supplied to the control terminals based on power mode requirements, the system can selectively turn on or off specific transistor cells. This parameter-based control approach simplifies the control mechanism compared to individual switching controls, as a single voltage parameter change affects multiple cells simultaneously according to their threshold characteristics
Data Source
AI summary
A power amplifier, a power amplifier system, and an operating method thereof are provided. The power amplifier system may include a power amplifier, a power amplifier controller, and a voltage generator. The power amplifier may include a plurality of power transistor cells each of which receives an RF signal through a control terminal thereof to amplify the RF signal. The power amplifier controller may control turn-on and turn-off operations of at least one power transistor cell among the plurality of power transistor cells based on a power mode. The voltage generator may generate a power supply voltage supplied to first terminals of the power transistor cells and may change the power supply voltage depending on the power mode.