Adaptive Gain Amplifier for Burst Signal Noise Suppression
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Solution Overview
Problem
Conventional amplifiers face challenges in reliably transmitting high-speed signals, particularly with repetitious burst signals, as they tend to amplify noise in idle periods and distort waveforms due to constant gain settings, leading to decreased signal reliability.
Innovation Solution
An amplification circuit with a gain control signal generator and gain adjustment elements that adjust gain based on input signal amplitude, ensuring lower gain during idle periods to suppress noise and higher gain during burst periods, optimizing signal transmission reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If constant gain setting is used in amplifier, then signal amplification is maintained, but noise amplification occurs in idle periods and waveform distortion increases
Solution Approach 1:
The patent applies dynamics by making the amplifier gain variable rather than constant. The gain control signal generator dynamically adjusts the gain based on the detected amplitude of the input signal, switching between a first gain for idle periods and a second gain for burst periods. This dynamic adjustment prevents noise amplification during idle periods while ensuring proper signal amplification during burst periods, thereby resolving the contradiction between maintaining signal amplification and preventing noise/distortion.
Solution Approach 2:
The patent changes the gain parameter based on signal amplitude conditions. When the input signal amplitude exceeds a threshold, the gain is set to the second value; when it remains below the threshold, the gain is set to the first value. This parameter change strategy allows the amplifier to adapt its amplification level to the actual signal conditions, preventing harmful noise amplification during idle periods while maintaining reliable signal transmission during active periods.
2Measurement precision
If high gain is applied continuously, then signal transmission accuracy is improved, but noise in idle periods is amplified leading to decreased reliability
Solution Approach 1:
The patent uses dynamic gain adjustment where the amplifier switches between a first gain (lower) for idle periods and a second gain (higher) for burst periods. During idle periods, the lower gain prevents noise amplification, maintaining reliability. During burst periods, the higher gain ensures accurate signal transmission. This dynamic switching resolves the contradiction between achieving high measurement precision and maintaining overall system reliability.
Solution Approach 2:
The gain parameter is changed based on the detected signal amplitude relative to a threshold. When the amplitude exceeds the threshold, the second gain is applied for accurate transmission; when it remains below, the first gain is applied to suppress noise. This conditional parameter change ensures both high transmission accuracy during signal bursts and high reliability during idle periods.
3Reliability
If gain control based on signal amplitude is implemented, then noise suppression in idle periods is achieved, but device complexity increases
Solution Approach 1:
The patent segments the amplification process into distinct gain modes: a first gain for idle periods and a second gain for burst periods. The gain control signal generator segments the control function by detecting signal amplitude and generating appropriate gain control signals. This segmentation allows the system to achieve high reliability through conditional gain adjustment while keeping each segment's complexity manageable through modular functional blocks.
Solution Approach 2:
The patent implements feedback by having the gain control signal generator detect the amplitude of the input signal and use this information to adjust the amplifier gain accordingly. The detected amplitude feeds back to the gain control mechanism, creating a closed-loop system that automatically suppresses noise during idle periods while maintaining proper amplification during signal bursts. This feedback mechanism achieves high reliability through intelligent control without requiring overly complex circuitry.
Data Source
AI summary
According to one embodiment, an amplification circuit includes an amplifier having a gain and amplifying the input signal based on the gain, and a gain control signal generator controlling the gain based on an amplitude of the input signal. The gain obtained when the amplitude of the input signal is less than a first amplitude and when the amplitude of the input signal is greater than a second amplitude is lower than the gain obtained when the amplitude of the input signal is between the first and second amplitudes or when the amplitude of the input signal is one of the first and second amplitudes. The second amplitude is greater than or equal to the first amplitude.