Doherty RF Module Layout for TX-RX Isolation in Compact Designs
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The existing radio-frequency modules with Doherty power amplifier circuits face challenges in size reduction while maintaining isolation between receiving and transmitting circuits, leading to potential signal interference and degradation of reception sensitivity.
Innovation Solution
The radio-frequency module is designed with a power amplifier circuit in Doherty configuration, where the carrier and peaking amplifiers are placed on one substrate surface and the low-noise amplifier on the opposite surface, along with a module substrate and resin members for mechanical strength and moisture resistance, and heat-dissipating conductors for efficient heat transfer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If a Doherty power amplifier circuit is used to achieve high efficiency and high power, then transmission performance is improved, but the number of circuit elements increases and isolation between reception and transmission circuits deteriorates
Solution Approach 1:
The patent transitions from a two-dimensional planar layout to a three-dimensional stacked configuration. The carrier amplifier and peaking amplifier are arranged on different layers (first main surface and second main surface) of the substrate, utilizing the vertical dimension to reduce lateral occupation area and improve circuit isolation while maintaining the Doherty configuration's high power efficiency
2Power
If a Doherty power amplifier circuit is used to achieve high efficiency and high power, then transmission performance is improved, but isolation between reception and transmission circuits deteriorates
Solution Approach 1:
By stacking the carrier amplifier on the first main surface and the peaking amplifier on the second main surface of the substrate, the patent creates vertical separation between transmission and reception circuits. This three-dimensional arrangement increases the effective isolation distance, reducing electromagnetic interference and signal leakage while preserving the high power output capability of the Doherty configuration
Solution Approach 2:
The patent divides the Doherty power amplifier into spatially separated segments: the carrier amplifier is positioned on one surface of the substrate while the peaking amplifier is positioned on the opposite surface. This segmentation physically isolates the high-power transmission paths, reducing harmful electromagnetic radiation and improving reception sensitivity
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 achieves size reduction with minimal compromise on isolation, reducing signal interference and enhancing reception sensitivity by separating transmission and reception paths effectively.
Implementation Method 1
heat-dissipating conductors for efficient heat transfer
Data Source
AI summary
A radio-frequency module including a module substrate having a first main surface and a second main surface on opposite sides; a low-noise amplifier disposed on the second main surface; and a power amplifier circuit in a Doherty configuration. The power amplifier including a first phase circuit; a second phase circuit; a carrier amplifier disposed on the first main surface and including an input terminal connected to a first end of the first phase circuit and an output terminal connected to a first end of the second phase circuit; and a peaking amplifier disposed on the first main surface and including an input terminal connected to a second end of the first phase circuit and an output terminal connected to a second end of the second phase circuit.