Three-Stage Doherty Power Amplifier With Peak Output Matching
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Solution Overview
Problem
Conventional Doherty amplifiers experience a significant decrease in efficiency at high frequencies due to the lack of a peak output matching network, which affects their performance in advanced wireless communication systems like Wi-Fi, 4G, and 5G.
Innovation Solution
A three-stage power amplifier architecture is implemented with integrated peak output matching, including a pre-driver, driver, and final stage, utilizing GaN devices and harmonic trapping circuits to enhance efficiency and impedance matching, eliminating the need for additional transformers and improving linearity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If conventional Doherty amplifiers are used without peak output matching network, then device complexity is reduced, but efficiency at high frequencies significantly decreases
Solution Approach 1:
The patent combines the peak amplifier and main amplifier into a single integrated amplifier module with unified impedance matching networks. The peak output matching network is integrated within the same package as the main amplifier, eliminating the need for separate external matching networks and transformers. This merging approach maintains high efficiency at high frequencies while reducing overall device complexity.
Solution Approach 2:
The impedance matching networks in the patent are designed to serve multiple functions simultaneously: they provide peak output matching for the peak amplifier, main output matching for the main amplifier, and inter-stage matching between different amplifier stages. This multi-functionality eliminates the need for separate matching networks for each function, thereby improving efficiency without proportionally increasing complexity.
2Reliability
If separate external matching networks are used for peak and main amplifiers, then impedance matching is improved, but device complexity increases
Solution Approach 1:
The patent integrates the peak output matching network and main output matching network within the same amplifier module package. The matching networks are designed to handle both peak and main amplifier impedance requirements simultaneously, eliminating the need for separate external matching networks and reducing overall system complexity while maintaining reliable impedance matching.
Solution Approach 2:
The impedance matching function is segmented into distinct networks within the integrated module: peak output matching network, main output matching network, and inter-stage matching networks. Each segment is optimized for its specific function but they work together as a unified system, providing reliable impedance matching without requiring separate external components.
3Reliability
If additional transformers are added to improve matching, then impedance matching is improved, but device complexity and size increase
Solution Approach 1:
The patent extracts the impedance matching function from separate external transformers and integrates it directly into the amplifier module's internal circuitry. The matching networks are implemented using on-chip inductors and capacitors that provide the necessary impedance transformation without requiring additional discrete transformer components, thereby reducing device complexity and size.
Solution Approach 2:
The patent replaces traditional mechanical transformers with integrated circuit-based impedance matching networks using on-chip passive components. This substitution eliminates the need for bulky magnetic components while achieving the same impedance matching function, reducing both device complexity and physical size.
Data Source
AI summary
Systems and circuits implementing an amplifier module are described. An integrated circuit can include a pre-driver stage, a driver stage and a final stage. The pre-driver stage can amplify an input signal to generate a first amplified signal. The driver stage can amplify the first amplified signal to generate a second amplified signal. The final stage can amplify the second amplified signal to generate an output amplified signal. The final stage can include a peak amplifier, a main amplifier, a peak input matching network, a peak output matching network, a main input matching network and a main output matching network. The peak output network can include a first matching section and a second matching section. The first matching section and the second matching section can perform different impedance matching. The main input matching network can include a harmonic trapping that traps a second harmonic of the second amplified signal.