MOSFET Amplifier Source Injection for RF Distortion Cancellation
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Solution Overview
Problem
Existing radio frequency signal processing amplifier devices generate undesirable distortion, affecting system performance.
Innovation Solution
A radio-frequency module and circuit design incorporating a low-noise amplifier with a common source transistor and a correction signal input path that cancels out unwanted portions of the input signal by injecting the correction signal into the source node, eliminating the need for a separate signal combiner and utilizing a MOSFET transistor with inductive components for noise cancellation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If a conventional amplifier device is used to amplify radio frequency signals, then signal amplification is achieved, but undesirable distortion is generated affecting system performance
Solution Approach 1:
The patent applies preliminary anti-action by generating a correction signal that is the inverse of the distortion signal before the amplification process. This correction signal is injected into the source node of the common source transistor to preemptively cancel out the unwanted distortion components, preventing them from being amplified along with the desired signal.
Solution Approach 2:
The patent introduces an intermediary correction signal path that includes a buffer amplifier and injection mechanism. This intermediary path processes the correction signal separately and combines it with the main signal path at the source node, allowing distortion cancellation without directly modifying the main amplification path.
2Object-generated harmful factors
If a separate signal combiner is added to cancel unwanted signal portions, then distortion cancellation is improved, but device complexity increases
Solution Approach 1:
The patent merges the signal combination function directly into the amplifier circuit by injecting the correction signal at the source node of the common source transistor. This integration eliminates the need for a separate external signal combiner device, reducing overall device complexity while maintaining distortion cancellation capability.
Solution Approach 2:
The source node of the common source transistor serves multiple functions: it is the input for the correction signal, the reference point for distortion cancellation, and part of the main amplification path. This multi-functionality reduces the need for separate dedicated components for each function.
Data Source
AI summary
A power amplifier circuit includes a transistor having a first terminal that is configured to receive an input signal, a second terminal electrically coupled to ground, and a third terminal configured to transmit a combined amplified signal. The power amplifier circuit further includes a combining signal input path electrically coupled to the second terminal and configured to receive a combining signal and provide the combining signal to the second terminal of the transistor to generate, at least in part, the combined amplified signal.