Amplifier Noise Suppression Circuit for Gain and Linearity
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Solution Overview
Problem
Conventional amplifier designs face challenges in effectively suppressing noise while maintaining gain and linearity, which is crucial for reliable communication systems where weak wanted signals are often overwhelmed by unwanted noise.
Innovation Solution
An amplifier circuit with a noise suppression block is introduced, which receives input and output signals, extracts unwanted noise components, and applies noise suppression to the output signal, thereby improving noise performance without affecting the amplifier's gain and linearity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If conventional amplifier design is used to amplify weak signals, then gain is improved, but noise figure deteriorates and unwanted noise overwhelms the wanted signal
Solution Approach 1:
The amplifier system is segmented into multiple functional blocks: a first amplifier for signal amplification, a noise extraction block for isolating noise components, and a second amplifier for noise suppression. This segmentation allows independent optimization of each block's function, enabling noise reduction without compromising the overall gain performance of the amplifier system.
2Object-affected harmful factors
If noise suppression techniques are applied to reduce unwanted noise, then noise figure is improved, but gain and linearity deteriorate
Solution Approach 1:
The noise extraction block specifically extracts unwanted noise components from the amplified signal by comparing the amplifier output with the original input signal. This extracted noise is then fed to the second amplifier for suppression. By taking out the noise component separately, the main amplifier can operate at high gain without being constrained by noise suppression requirements, thus maintaining both high gain and low noise figure.
3Device complexity
If conventional amplifier design is used, then device complexity is kept simple, but noise performance deteriorates and weak signal detection becomes unreliable
Solution Approach 1:
The system employs feedback mechanisms where the output signal is fed back through the noise extraction block to compare with the input signal. This feedback loop enables continuous noise extraction and suppression, improving the reliability of weak signal detection. The feedback approach maintains relatively simple device structure while significantly enhancing noise performance and detection reliability.
Data Source
AI summary
An amplifier circuit includes an amplifier and a noise suppression block. The amplifier is arranged for receiving an input signal at an input port and generating an output signal at an output port according to the input signal. The noise suppression block is coupled between the input port and the output port of the amplifier, and arranged for receiving the input signal and the output signal and applying noise suppression to the output signal generated from the amplifier according to the received input signal and the received output signal.