Doherty Amplifier Open Stub Layout for Circuit Miniaturization
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Solution Overview
Problem
Existing Doherty amplifier circuits and semiconductor devices for these circuits face challenges in reducing size due to the need for phase adjusters and impedance converters, which increase the overall size and complexity.
Innovation Solution
The proposed Doherty amplifier circuit and semiconductor device incorporate a divider to split input signals, amplifiers to process these signals, a combining node, an open stub for phase adjustment, and impedance converters to minimize size by allowing for the shortening of open stubs and optimizing the placement of components on a circuit board.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If phase adjusters and impedance converters are added to the Doherty amplifier circuit, then the phase adjustment capability is improved, but the device size increases
Solution Approach 1:
The open stub is designed to serve dual functions: it acts as both an impedance converter and a phase adjuster simultaneously. By configuring the stub with specific electrical lengths and connection points, it provides both the necessary impedance transformation and phase adjustment in a single component, eliminating the need for separate phase adjuster devices and reducing overall circuit size.
Solution Approach 2:
The invention merges the functions of the phase adjuster and impedance converter into a single integrated structure. The open stub combines both functionalities by strategically positioning its connection points and adjusting its electrical length, thereby consolidating multiple components into one and reducing the device footprint.
2Adaptability or versatility
If multiple components (phase adjusters, impedance converters) are included in the circuit, then the circuit functionality is improved, but the device complexity increases
Solution Approach 1:
The open stub is designed as a multi-functional component that simultaneously performs impedance conversion and phase adjustment. This universal component approach maintains full circuit functionality while reducing the total number of discrete components, thereby simplifying the overall circuit architecture and reducing complexity.
Solution Approach 2:
The invention extracts and eliminates redundant components from the traditional Doherty amplifier circuit. By removing separate phase adjusters and integrating their functionality into the open stub structure, the circuit maintains its essential functions with fewer components, reducing complexity while preserving adaptability.
3Area of stationary object
If the open stub length is reduced for miniaturization, then the device size is reduced, but the phase adjustment precision may deteriorate
Solution Approach 1:
The invention applies local quality optimization by strategically positioning the open stub at specific locations in the circuit and configuring its electrical length to provide the necessary phase adjustment precision. The stub is connected at optimized points along the transmission lines, ensuring that even with reduced physical length, the local electrical characteristics provide sufficient phase control precision for the amplifier's operation.
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
This configuration enables miniaturization of the Doherty amplifier circuit and semiconductor device by reducing the physical length of open stubs and optimizing component placement, thereby improving size efficiency without compromising performance.
Implementation Method 1
an open stub disposed on the circuit board, the open stub having an end electrically connected to a path between the divider and the first amplifier
Implementation Method 2
a first impedance converter disposed on the circuit board, the first impedance converter having a first end electrically connected to the second amplifier and a second end electrically connected to the combining node
Implementation Method 3
a first amplifier disposed on the circuit board and that amplifies the first signal and outputs an amplified first signal as a fourth signal
Data Source
AI summary
A Doherty amplifier circuit includes a divider configured to divide a received input signal into a first signal and a second signal, a circuit board, a first amplifier amplifying the first signal and output the amplified first signal as a fourth signal, a second amplifier and amplifying the second signal and output the amplified second signal as a fifth signal, a combining node combining the fourth signal and the fifth signal into a combined signal and output the combined signal to an output terminal as an output signal, an open stub, the open stub having an end electrically connected to a path between the divider and the first amplifier, and a first impedance converter, the first impedance converter having a first end electrically connected to the second amplifier and a second end electrically connected to the combining node.