Multi-Band Amplifier With Dual Impedance Matching and Adjustable Gain
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Solution Overview
Problem
Conventional multi-band amplifiers experience performance degradation due to differences in optimized frequencies between active and passive circuits, leading to suboptimal performance across various frequency bands.
Innovation Solution
A multi-band amplifier design incorporating impedance matching parts and cascode amplifiers with transistors connected to control terminals, allowing for adjustable amplification gain across different frequency bands, and an output impedance matching part to enhance signal processing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If a passive device is applied to suppress current consumption without a separate output terminal buffer, then current consumption is reduced, but the entire performance of the amplifier is degraded as a difference between the optimized frequencies increases
Solution Approach 1:
The patent merges the active circuit and passive circuit into a unified design where the common source amplifier and common gate amplifier are integrated with impedance matching networks. This integration allows both circuits to be optimized for the same frequency bands, eliminating the performance degradation caused by frequency mismatches while maintaining low current consumption through the passive device architecture.
Solution Approach 2:
The amplifier design implements multi-functionality by making the same amplifier circuit capable of operating across multiple frequency bands (e.g., LTE bands). The common source and common gate amplifiers are designed to handle different frequency ranges, allowing a single device to serve multiple communication standards without requiring separate optimized circuits for each band.
2Adaptability or versatility
If the difference between a resonance point of a filter part and a resonance point of an amplifying part is increased, then frequency band coverage is expanded, but the performance is degraded
Solution Approach 1:
The patent employs dynamic frequency tuning capabilities where the resonance points of both the filter part and amplifying part can be adjusted to match the desired operating frequency. This is achieved through variable capacitors or inductors that allow the resonance frequencies to be dynamically aligned, ensuring optimal performance across different frequency bands while maintaining expanded frequency coverage.
Data Source
AI summary
Provided is a multi-band amplifier and a method of amplifying a multi-band. The multi-band amplifier includes a wireless signal input terminal into which a first frequency band signal and a second frequency band signal are input, a first impedance matching part connected to the wireless signal input terminal and configured to match an input impedance in a first frequency band, a second impedance matching part connected to the wireless signal input terminal and configured to match an input impedance in a second frequency band, a common source amplifier to which the first impedance matching part and the second impedance matching part, and a common gate amplifier connected to the common source amplifier. Accordingly, performance degradation can be reduced in comparison with a conventional amplifier, broadband amplification as well as narrow band amplification can be performed, and an amplification gain can be adjusted.