Balanced Differential Amplifier Without a Power Distributor
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Solution Overview
Problem
The increasing frequency bands in wireless communication systems, such as 5G and 6G, require smaller and more efficient power amplifiers to reduce the area occupied by amplifiers while maintaining signal transmission quality.
Innovation Solution
A single differential-based balanced amplifier design incorporating a differential amplifier, phase delay circuit, and hybrid coupler, which combines differential output signals in phase to reduce the need for a power distributor and minimize circuit complexity, thereby reducing the amplifier's area and enhancing resilience to antenna voltage standing wave ratio (VSWR) changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple power amplifiers are used to cover different frequency bands, then signal transmission quality is improved, but the area occupied by amplifiers increases
Solution Approach 1:
The patent implements a multi-functional power amplifier capable of operating across multiple frequency bands (e.g., n77, n78, n79) through a single device. The amplifier uses a broadband matching network and adjustable gain control to adapt to different frequency requirements, eliminating the need for separate amplifiers for each band and thereby reducing the overall area occupied while maintaining signal transmission quality across all bands.
2Ease of operation
If a power distributor is used to combine differential output signals, then signal combination is achieved, but device complexity increases
Solution Approach 1:
The patent extracts and eliminates the power distributor component from the circuit by directly combining the differential output signals from the first and second power amplifiers at the output stage. The matching network is designed to handle the signal combination function that would otherwise require a separate power distributor, thereby reducing device complexity while maintaining the ability to combine signals effectively.
3Area of stationary object
If circuit components are reduced to minimize area, then area occupied is reduced, but manufacturing precision requirements increase
Solution Approach 1:
The patent employs a dynamically adjustable matching network with variable impedance elements that can be tuned to optimize performance across different frequency bands and operating conditions. This dynamic adjustment capability allows the circuit to maintain high manufacturing precision requirements through active compensation and tuning, rather than relying solely on fixed precision components, thereby reducing area while managing precision requirements.
Data Source
AI summary
Provided is a single differential-based balanced amplifier including one differential amplifier configured to receive a first differential input signal and a second differential input signal having a phase difference of 180 degrees from the first differential input signal, and output a first differential output signal at a first output terminal and a second differential output signal at a second output terminal, a phase delay circuit configured to receive the first differential output signal, and output a third differential output signal obtained by adjusting a phase of the first differential output signal relative to the second differential output signal by 90 degrees, and a hybrid coupler configured to receive the second differential output signal at a first port, receive a third differential output signal at a third port, and output, at a second port, an in-phase signal in which RF power of the second differential output signal and the third differential output signal are combined in phase.