On-Package Multi-Stage Decoupling for Wideband RF Power Amplifiers
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Modern RF power amplifiers face challenges in achieving high efficiency and linearity, particularly in handling high-PAPR signals, due to resonance issues in bias voltage feed circuits and the need for compact, wideband operation, which is exacerbated by increasing bandwidth requirements and space constraints in wireless communication networks.
Innovation Solution
Integration of multi-stage decoupling networks within the package of RF power amplifiers, comprising resistance, inductance, and capacitance configurations that resonate at different frequencies below the operating band, providing low impedance paths to RF signal ground, thereby reducing impedance and enabling wideband linearity and compact size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If a single power amplifier is used to transmit high-PAPR signals, then the amplifier can be sized for signal peaks, but it operates at very low power on average resulting in poor efficiency
Solution Approach 1:
The patent divides a single amplifier into multiple amplifier stages (e.g., first amplifier, second amplifier, third amplifier) with different operating characteristics. Each stage handles specific portions of the signal, allowing the system to maintain high efficiency while handling high-PAPR signals. The segmentation enables different amplifiers to operate at optimal points rather than one amplifier operating inefficiently across the entire power range.
2Reliability
If decoupling networks are added to reduce impedance and improve linearity, then wideband linearity is achieved, but the device size increases
Solution Approach 1:
The patent integrates decoupling networks within the existing amplifier package structure, nesting the decoupling functionality inside the amplifier housing. The decoupling networks are positioned within the package cavity, utilizing available space efficiently. This nesting approach provides the necessary impedance reduction and linearity improvement without significantly increasing the overall device volume.
Solution Approach 2:
The patent employs three-dimensional positioning of decoupling networks and bias voltage feed circuits within the package cavity, utilizing vertical and lateral dimensions to route connections. By transitioning from a two-dimensional layout to three-dimensional arrangement, the design accommodates additional decoupling components without proportionally increasing the device footprint.
3Adaptability or versatility
If bandwidth requirements are increased for advanced wireless networks, then communication capability is improved, but resonance issues in bias voltage feed circuits are exacerbated
Solution Approach 1:
The patent introduces decoupling networks as intermediary elements between the bias voltage feed circuits and the amplifier stages. These decoupling networks act as mediators that filter out resonant frequencies and stabilize the bias voltage delivery across wide bandwidth operations. The intermediaries prevent resonance issues from propagating through the system while maintaining the expanded bandwidth capability.
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 solution achieves wideband linearity and reduces the size of RF power amplifiers, enhancing efficiency and minimizing power consumption, particularly suitable for advanced antenna systems in 4G and 5G wireless networks.
Implementation Method 1
Each multi-stage decoupling network includes two or more decoupling stages. Each decoupling stage is configured to resonate at a different, characteristic frequency below an operating band of the amplifier circuit
Data Source
Figure 1~2
Figure 3A~3B
Figure 4A~4B
AI summary
An electronic package houses one or more RF amplifiers (18, 18a, 18b). At least one of an input or output impedance matching network (16, 16a, 16b, 20, 20a, 20b) integrated on the package and electrically coupled to the gate or drain bias voltage connection, respectively, of an RF amplifier (18, 18a, 18b), includes a multi-stage decoupling network. Each multi-stage decoupling network includes two or more decoupling stages. Each decoupling stage of the multi-stage decoupling network includes a resistance, inductance, and capacitance, and is configured to reduce impedance seen by the RF amplifier (18, 18a, 18b) at a different frequency below an operating band of the amplifier circuit. Bias voltage connections to the impedance matching networks (16, 16a, 16b, 20, 20a, 20b) may be shared, and may be connected anywhere along the multi-stage decoupling network.