Power Amplifying Module Asymmetric Balun Winding
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Solution Overview
Problem
In power amplifying modules with multiple differential amplifying circuits for various communication bands, asymmetry of differential signals occurs due to characteristic variations and component layout, leading to characteristic degradation.
Innovation Solution
A power amplifying module configuration with multiple differential amplifying circuits on a substrate, where each circuit includes a chip device with amplifiers, a balun with asymmetrically positioned winding wires, and capacitors between the power feed point and reference potential, reducing gain and phase differences and improving signal asymmetry.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If a differential amplifying circuit is used to amplify single-ended signals, then the gain of the power amplifier can be easily increased, but asymmetry of differential signals occurs due to characteristic variations and layout, leading to characteristic degradation
Solution Approach 1:
The patent applies asymmetry by intentionally making the distances from the power feed point to each end of the primary side winding wire different. This asymmetric configuration compensates for the inherent asymmetries in the differential amplifying circuit, including characteristic variations of amplifiers and layout asymmetries, thereby reducing gain and phase differences between differential signals while maintaining high gain performance
2Adaptability or versatility
If multiple differential amplifying circuits for different communication bands are installed in a single module, then device versatility is improved, but interference between circuits occurs, increasing signal asymmetry
Solution Approach 1:
The patent applies local quality by optimizing the power feed point position specifically for each differential amplifying circuit within the multi-band module. Each circuit's primary side winding wire has its power feed point positioned at a specific location that creates appropriate asymmetric distances, allowing each circuit to compensate for its own asymmetries independently while coexisting in the same module without mutual interference
Data Source
AI summary
In a power amplifying module in which a plurality of differential amplifying circuits is mounted on a substrate, each of the differential amplifying circuits includes a chip device that includes at least two amplifiers, each of the at least two amplifiers amplifying a differential signal, a balun that includes a primary side winding wire and a secondary side winding wire, both ends of the primary side winding wire being connected to an output of the chip device, and a capacitor provided between a power feed point of the primary side winding wire and a reference potential. In at least one of the plurality of the differential amplifying circuits, the distance from one end of the primary side winding wire to the power feed point is different from the distance from the other end of the primary side winding wire to the power feed point.