Burst Packet Feedback Amplifier With Dynamic Gain Resistance
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Solution Overview
Problem
Feedback amplifiers in optical communication systems struggle to detect small input signals and adjust gain effectively, especially when there is a significant difference between input signals, leading to inadequate reception sensitivity and dynamic range in passive optical networks.
Innovation Solution
The proposed feedback amplifier includes an amplification circuit, a feedback circuit with adjustable resistance, a packet signal detection unit, and a bias circuit, which dynamically adjusts the feedback resistance value and gain based on control signals and bias voltage to enhance detection and amplification of small input signals and accommodate varying signal levels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a feedback transistor is used to control feedback current, then gain control is achieved, but small input signals cannot be detected
Solution Approach 1:
The feedback resistance is made dynamically adjustable through a switch transistor that can connect or disconnect feedback resistors based on control signals. This dynamic adjustment allows the system to optimize feedback resistance for detecting small input signals while maintaining gain control capability, resolving the contradiction between detection sensitivity and signal loss.
2Adaptability or versatility
If gain control is adjusted for large signal differences, then dynamic range is improved, but reception sensitivity deteriorates
Solution Approach 1:
The feedback resistance control is segmented into multiple levels by providing multiple feedback resistors (first feedback resistor, second feedback resistor) that can be selectively connected. This segmentation allows the system to choose appropriate feedback resistance values for different signal conditions, achieving both wide dynamic range and high reception sensitivity through staged resistance adjustment.
3Device complexity
If feedback resistance is fixed, then circuit simplicity is maintained, but gain adjustment capability is lost
Solution Approach 1:
The feedback resistance is transformed from a fixed component to a dynamically adjustable one using a switch transistor controlled by control signals. This dynamic configuration allows the circuit to maintain simplicity in basic structure while gaining the ability to adjust feedback resistance and consequently control gain, resolving the contradiction between simplicity and adaptability.
Data Source
AI summary
Provided is a feedback amplifier. The feedback amplifier includes: an amplification circuit unit amplifying a burst packet signal inputted from an input terminal and outputting the amplified voltage to an output terminal; a feedback circuit unit disposed between the input terminal and the output terminal and controlling whether to apply a fixed resistance value to a signal outputted to the output terminal; a packet signal detection unit detecting a peak value of a burst packet signal from the output terminal and controlling whether to apply the fixed resistance value; and a bias circuit unit generating a bias voltage, wherein the feedback circuit unit determines a feedback resistance value to change the fixed resistance value in response to at least one control signal and adjusts a gain by receiving the bias voltage.