Distributed Sub-Amplifier Injection for Low-Loss Output Compensation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing amplifier circuits face inefficiencies and interaction problems in error correction, particularly with high peak-to-average power ratios and hard compression, due to limitations in transformer coupling and directional coupler methods, which result in low efficiency and increased costs for handling large transient error signals.
Innovation Solution
The proposed amplifier circuit employs multiple sub-amplifiers distributed along the output transmission line to inject compensation signals, configured to minimize backward travel and maximize forward correction, achieving high efficiency and directivity while reducing coupler losses and interaction issues.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If transformer coupling is used for error injection, then the circuit structure is simple, but the efficiency is low and interaction problems occur with high peak-to-average power ratios
Solution Approach 1:
The error amplifier is segmented into multiple sub-amplifiers (first, second, third sub-amplifiers) with different output impedances. Each sub-amplifier is connected to the output transmission line at different positions, allowing the system to handle high peak-to-average power ratio signals more efficiently by distributing the error correction across multiple segments with optimized impedance characteristics.
Solution Approach 2:
Different sub-amplifiers are assigned different output impedances tailored to their specific positions on the transmission line. The first sub-amplifier has a first output impedance, the second has a second output impedance, and the third has a third output impedance. This local optimization of impedance matching at each injection point minimizes reflections and maximizes efficiency for transient error signals.
2Reliability
If directional coupler is used for error injection, then backwards isolation is high, but coupler losses increase and costs rise for handling large transient error signals
Solution Approach 1:
The invention extracts the error injection function from the traditional directional coupler structure and implements it directly through multiple sub-amplifiers connected at different positions on the output transmission line. This eliminates the need for a separate directional coupler component, thereby removing its associated losses and costs while maintaining high backwards isolation through proper impedance matching and positioning of the sub-amplifiers.
3Manufacturing precision
If multiple feedforward stages are used to reduce error, then linearity is improved, but device complexity and cost increase
Solution Approach 1:
The invention combines multiple error injection functions into a single integrated structure where three sub-amplifiers operate simultaneously at different positions on the output transmission line. This merged approach achieves the linearity improvement of multiple stages without the corresponding increase in overall device complexity, as all sub-amplifiers are part of one unified error correction system rather than separate cascaded stages.
Data Source
AI summary
An amplifier circuit (200) for compensating an output signal provided at an output (212) of a circuit (210) is disclosed. The amplifier circuit (200) comprises an output transmission line (230) connected between the output (212) of the circuit (210) and an output port (240) and an amplifier (220). The amplifier (220) comprises multiple sub-amplifiers (221, 222, 223, 224), inputs of the multiple sub-amplifiers (221, 222, 223, 224) are coupled to an input transmission line (250) for receiving an error signal; and outputs of the multiple sub-amplifiers (221, 222, 223, 224) are coupled at respective places along the output transmission line (230) to inject a compensation signal to the output port (240). The error signal is derived from a reference input signal and the output signal of the circuit (210), and is amplified in the amplifier (220) into the compensation signal.