Push-Pull RF Amplifier Balun-Capacitor Matching for Wider Bandwidth
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Solution Overview
Problem
The design of push-pull RF power amplifiers for 5G technology faces challenges in achieving both performance and miniaturization due to complex circuit structures and large occupied area, particularly in impedance matching and bandwidth performance.
Innovation Solution
A push-pull RF power amplifier circuit is designed with a first differential amplifier transistor, a second differential amplifier transistor, a balun, and a capacitor network, where the primary coil of the balun consists of connected coil segments and the capacitor network is integrated at the joint of these segments, participating in impedance matching to enhance bandwidth performance while reducing the circuit's size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If more impedance matching elements are used to achieve performance indexes such as impedance matching, then the impedance matching performance is improved, but the circuit structure becomes complex and the occupied area increases
Solution Approach 1:
The patent combines the DC blocking capacitor function with the impedance matching network by integrating the capacitor into the existing impedance matching elements. Specifically, the first and second capacitors that are part of the impedance matching network also serve as DC blocking capacitors, eliminating the need for separate DC blocking capacitors and reducing circuit complexity while maintaining both DC blocking and impedance matching performance
2Manufacturing precision
If more impedance matching elements are used to achieve performance indexes such as impedance matching, then the impedance matching performance is improved, but the occupied area increases
Solution Approach 1:
The patent merges the DC blocking function with the impedance matching network components. The first capacitor is integrated into the first impedance matching network and the second capacitor is integrated into the second impedance matching network, allowing these capacitors to simultaneously perform DC blocking and impedance matching functions. This integration eliminates the need for additional separate DC blocking capacitors, thereby reducing the total occupied area while maintaining both DC blocking and impedance matching performance
3Reliability
If a conventional DC blocking capacitor is used in series between the amplifier transistor output and the balun, then the DC blocking function is achieved, but the occupied area increases and bandwidth performance deteriorates
Solution Approach 1:
The patent makes the impedance matching capacitors serve multiple functions: they simultaneously act as DC blocking capacitors and impedance matching elements. The first capacitor in the first impedance matching network and the second capacitor in the second impedance matching network both block DC signals while providing impedance matching, thereby eliminating the need for separate DC blocking capacitors and reducing the occupied area
4Reliability
If a conventional DC blocking capacitor is used in series between the amplifier transistor output and the balun, then the DC blocking function is achieved, but the bandwidth performance deteriorates
Solution Approach 1:
The patent integrates the DC blocking function into the impedance matching network capacitors. The first and second capacitors simultaneously provide DC blocking and impedance matching across the operating bandwidth. By making these capacitors part of the impedance matching network rather than separate series components, the circuit maintains better bandwidth performance while achieving DC blocking function
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 improves the bandwidth performance of the push-pull power amplifier, specifically for fundamental wave impedance, and reduces the occupied area while maintaining overall performance, optimizing the RF front-end module's efficiency.
Implementation Method 1
the capacitor network and first balun jointly participate in impedance matching of the push-pull RF power amplifier circuit to improve the bandwidth performance
Implementation Method 2
a primary coil of the first balun includes a first coil segment and a second coil segment
Data Source
AI summary
Discloses is a push-pull RF power amplifier circuit, comprising a first differential amplifier transistor, a second differential amplifier transistor, a first balun and a capacitor network. In this application, the primary coil of first balun is improved into a structure in which the first and second coil segment are connected with each other, and the capacitor network is connected at the joint of the first and second coil segment. The capacitor network and first balun jointly participate in impedance matching of the push-pull RF power amplifier circuit, so that the push-pull power amplifier system can support larger bandwidth while achieving impedance matching. There is no need to separately connect capacitors between the output end of the first differential amplifier transistor and the first input end of the first balun, or between the output end of the second differential amplifier transistor and the second input end of the first balun.