Doherty Amplifier Auxiliary Switching for Low-Power Efficiency
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Solution Overview
Problem
Current Doherty power amplifiers lack efficiency in managing operational states of auxiliary amplifiers based on input signal voltage, leading to suboptimal performance and power consumption.
Innovation Solution
A Doherty power amplifier design that includes a controller to switch the operational state of the auxiliary amplifier between operational and non-operational states based on input signal voltage thresholds, ensuring it operates only when the voltage exceeds a certain threshold, with a common split signal and phase-matched output via a Doherty power combiner, utilizing transistor amplifiers and digital or analog control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the auxiliary amplifier operates continuously in conventional Doherty amplifiers, then the amplifier can handle high power signals, but power consumption increases and efficiency decreases during low-power operation
Solution Approach 1:
The patent implements dynamic control of the auxiliary amplifier's operational state based on real-time input signal voltage levels. The controller switches the auxiliary amplifier between operational and non-operational states, creating a dynamic system that adapts to varying signal conditions. This resolves the contradiction by enabling high power handling when needed while minimizing power consumption during low-power operation.
Solution Approach 2:
The patent changes the operational parameter of the auxiliary amplifier from a fixed continuous operation state to a variable state that depends on input signal voltage thresholds. By monitoring input voltage and switching the auxiliary amplifier's state accordingly, the system optimizes the balance between power handling capability and power consumption efficiency.
2Use of energy by moving object
If the auxiliary amplifier is switched based on input voltage thresholds, then power efficiency is improved, but the complexity of the control system increases
Solution Approach 1:
The patent employs feedback control where the controller continuously monitors the input signal voltage and compares it against predefined thresholds. This feedback mechanism enables automatic switching of the auxiliary amplifier's operational state, improving power efficiency while keeping the control logic relatively simple and systematic.
3Use of energy by moving object
If the auxiliary amplifier operates at higher input voltage thresholds, then power consumption is reduced during normal operation, but the transition to high-power mode may be delayed
Solution Approach 1:
The patent sets predetermined input voltage thresholds that trigger the auxiliary amplifier's activation. By establishing these thresholds in advance based on the desired balance between power efficiency and response time, the system prepares for high-power mode transitions proactively, ensuring both energy savings during normal operation and timely response when high power is needed.
Data Source
AI summary
A Doherty power amplifier including a main amplifier, an auxiliary amplifier and a controller governing the operation of the auxiliary amplifier, the controller being operative to switch the operational state of the auxiliary amplifier between an operational state and a non-operational state as a function of input signal voltage supplied to the power amplifier such that the auxiliary amplifier is inoperative when the input voltage is below an input voltage threshold and is operative when the input voltage is above the input voltage threshold.