Power Amplifier Circuit With Shared Harmonic Processing
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Solution Overview
Problem
Existing power amplifier circuits, such as the Doherty amplifier, require separate harmonic processing circuits for each amplifier, increasing circuit size and complexity.
Innovation Solution
A power amplifier circuit design that incorporates an impedance conversion unit using parallel lines and a capacitor, allowing for shared harmonic processing and reducing the number of circuit elements, thereby minimizing circuit size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separate harmonic processing circuits are provided for each amplifier, then each amplifier can be optimized for its specific operation, but the circuit size increases
Solution Approach 1:
The patent combines the harmonic processing functions for both the carrier amplifier and peak amplifier into a single shared harmonic processing circuit. This circuit processes harmonics from both amplifiers simultaneously, eliminating the need for separate harmonic processing circuits for each amplifier while maintaining optimal performance for both.
Solution Approach 2:
The shared harmonic processing circuit is designed to handle harmonic signals from multiple sources (both amplifiers) with different operating characteristics. It performs multiple functions including impedance transformation and harmonic filtering that would otherwise require separate dedicated circuits for each amplifier.
2Reliability
If separate harmonic processing circuits are provided for each amplifier, then each amplifier operates independently with optimized harmonic control, but the device complexity increases
Solution Approach 1:
The patent merges multiple harmonic processing functions into a single integrated circuit structure, reducing the total number of circuit elements while maintaining effective harmonic control for both amplifiers through shared processing resources.
3Measurement precision
If multiple separate circuits are used for impedance conversion and harmonic processing, then each circuit can be optimized for specific frequency characteristics, but passage loss increases
Solution Approach 1:
The patent combines impedance conversion and harmonic processing into a single integrated circuit path, reducing the number of connection points and impedance transformations required. This consolidation minimizes signal loss while maintaining precise frequency characteristics through optimized circuit design.
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
The design achieves a reduction in circuit size while maintaining efficient operation by using a single impedance conversion unit and shared harmonic processing circuit for both amplifiers, improving frequency characteristics and reducing passage loss.
Implementation Method 1
a first capacitor with one end connected to a connection point between the first line and the second line and with another end connected to a reference potential
Data Source
AI summary
A power amplifier circuit includes a first amplifier, a second amplifier, and, an output terminal. The power amplifier circuit includes an impedance conversion unit connected to an output end of one amplifier, which is either the first amplifier or the second amplifier. The impedance conversion unit includes a first line with one end connected to the output end, a second line with one end connected to another end of the first line, and a first capacitor with one end connected to a connection point between the first line and the second line and with another end connected to a reference potential. The first line and the second line are coupled to each other. A signal based on a connection point between an output end of another amplifier of the first amplifier and the second amplifier and another end of the second line is outputted from the output terminal.