Low-Noise Amplifier Circuitry With Non-Linearity Suppression
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Solution Overview
Problem
Designing satisfactory low noise amplifier circuitry for electronic devices with wireless communications capabilities is challenging due to non-linear behavior of components like core amplification transistors and degeneration inductors, which degrade signal quality.
Innovation Solution
Incorporating non-linearity suppression circuitry with intermodulation and harmonic distortion suppression circuits, including auxiliary transistors and frequency-selective filters, to mitigate non-linear behavior in low noise amplifiers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional low noise amplifier circuitry is used, then the amplifier can provide signal amplification, but non-linear behavior of components degrades signal quality
Solution Approach 1:
The patent introduces an auxiliary transistor as an intermediary element that generates a corrective signal to counteract the non-linear distortion produced by the main amplification transistor. This auxiliary transistor acts as a mediator that processes the input signal and subtracts the distorted components from the main amplification path, thereby improving signal quality without requiring complete redesign of the core amplifier
Solution Approach 2:
The patent implements a feedback mechanism where the auxiliary transistor receives the input signal and generates a correction signal based on the non-linear characteristics of the main transistor. This feedback loop continuously compensates for distortion by injecting the corrected signal back into the amplification path, maintaining linear operation across varying signal conditions
2Reliability
If non-linearity suppression circuitry is added to reduce distortion, then signal quality improves, but circuit complexity increases
Solution Approach 1:
The patent segments the amplification function into two distinct paths: a main amplification path using the primary transistor and a correction path using the auxiliary transistor. Each path handles specific aspects of signal processing, allowing independent optimization and simplifying the design of each segment while achieving overall linear performance
Solution Approach 2:
The patent merges the main amplification function and the distortion correction function into a single integrated circuit structure. The auxiliary transistor is coupled in parallel with the main transistor, and their outputs are combined through shared circuit elements, creating a unified amplifier that delivers both high gain and low distortion without requiring separate amplifier stages
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 proposed solution effectively reduces intermodulation and harmonic distortions, enhancing the linear response of low noise amplifiers and improving signal quality.
Implementation Method 1
a filter coupled to the degeneration inductor... The filter can include a notch filter configured to filter out a harmonic frequency of the fundamental frequency
Implementation Method 2
The inductor of the filter can be coupled to the degeneration inductor to form a transformer
Data Source
AI summary
An electronic device may include wireless circuitry with a processor, a transceiver circuit, a front-end module, and an antenna. The front-end module may include amplifier circuitry such as a low noise amplifier for amplifying received radio-frequency signals. The amplifier circuitry may include non-linearity suppression circuitry that suppresses or reduces non-linear behavior of components such as a core amplification transistor and a degeneration inductor within the amplifier circuitry. The non-linearity suppression circuitry may include an intermodulation distortion suppression circuit having an auxiliary amplification transistor. The non-linearity suppression circuitry may include a frequency-selective filter coupled to the degeneration inductor.