Multipath Amplifier Switching for Fast Common-Mode Recovery
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Solution Overview
Problem
Existing multiple path amplifier circuits experience significant disturbance during abrupt changes in common mode voltage, leading to prolonged recovery times.
Innovation Solution
A multipath amplifier circuit with a control unit that detects changes in common mode voltage, temporarily reroutes the signal through a unity-gain amplifier to reduce disturbance time, using a first and second amplification paths with a notch filter and differential amplifier circuits to compensate for offset voltages.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If a multiple path amplifier circuit is used to amplify input voltage, then amplification capability is improved, but disturbance time during abrupt common mode voltage changes increases
Solution Approach 1:
The amplifier circuit dynamically switches between different operational modes based on the input signal characteristics. The control unit detects abrupt common mode voltage changes and temporarily reconfigures the circuit by opening the first path and coupling nodes through a unity-gain amplifier, then returns to normal operation, optimizing performance for different operating conditions
Solution Approach 2:
The amplifier circuit is divided into multiple independent amplification paths (first path with notch filter, second path without) that can be selectively activated. This segmentation allows the circuit to choose the appropriate path based on whether abrupt common mode changes are detected, reducing interference and recovery time
2Object-affected harmful factors
If a notch filter is added to the first amplification path to reduce interference, then filtering capability is improved, but circuit complexity increases
Solution Approach 1:
The circuit is segmented into multiple amplification paths, with the notch filter placed only in the first path. This selective placement provides interference filtering where needed while keeping the second path simpler, balancing filtering capability with overall circuit complexity
Solution Approach 2:
The control unit acts as an intermediary that detects abrupt common mode voltage changes and dynamically reconfigures the circuit by opening the first path and coupling nodes through a unity-gain amplifier, reducing the impact of the notch filter during critical transitions
Data Source
AI summary
The present disclosure relates to a multipath amplifier method and circuit comprising a first and a second amplification path for an input voltage, coupled in parallel, the first path comprising a first amplifier stage, a second amplifier stage and a notch filter between a first node coupled to the second amplifier stage and a second node coupled to an output of the first amplifier stage, and a control unit configured, following detection of a change in common mode of the input voltage, for a first duration to open the first path and to couple the first node to the second node through a unity-gain amplifier.