Chopper Amplifier Ripple Reduction Loop for Fast Transient Settling
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Solution Overview
Problem
Chopper amplifiers face slow transient settling performance due to the slow recovery of RRL loop errors during non-linear events, which degrades the overall chopper amplifier system's performance.
Innovation Solution
Implementing a fast settling ripple reduction loop that detects non-linear events, temporarily suspends the RRL, and drives integrator and hold capacitor voltages to a state preceding the event, thereby reducing settling time by lowering the RRL bandwidth relative to the chopping frequency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a ripple reduction loop (RRL) is used to suppress output voltage ripple, then ripple suppression performance is improved, but transient settling performance deteriorates due to slow recovery from non-linear events
Solution Approach 1:
The patent implements dynamic bandwidth adjustment of the RRL by detecting non-linear events (such as input common-mode voltage transitions) and temporarily reducing the RRL bandwidth during these events. This allows the system to maintain low ripple suppression during normal operation while enabling fast settling during transient conditions. The bandwidth is adjusted based on the operational state of the amplifier, creating a time-varying filter characteristic that adapts to different operating conditions.
2Stability of the object's composition
If the RRL bandwidth is lowered to improve loop stability and reduce ripple, then ripple suppression is improved, but the recovery speed from non-linear events slows down
Solution Approach 1:
The system dynamically adjusts the RRL bandwidth based on the operational state. During normal linear operation, a lower bandwidth is maintained for stability and ripple suppression. During non-linear events detected by the control logic, the bandwidth is temporarily increased to accelerate recovery. This dynamic adjustment allows the system to optimize both stability and speed at different times rather than being constrained by a fixed bandwidth setting.
Solution Approach 2:
The patent employs periodic sampling and detection of operational conditions to determine when to adjust the RRL bandwidth. The system continuously monitors for non-linear events and periodically updates the bandwidth setting accordingly, creating a rhythm of adjustment that responds to the periodic nature of signal processing operations and transient events.
Data Source
AI summary
A method for a fast settling ripple reduction loop for high speed precision chopper amplifiers includes amplifying an input signal with a signal path to generate a first output, the signal path comprising chopping the input signal to generate a first chopper output, amplifying the first chopper output with an amplifier to generate an amplifier output and chopping the amplified output to generate a second chopper output. An output ripple of the first output is reduced with a Ripple Reduction Loop comprising chopping the second chopper output to generate a third chopper output, filtering the third chopper output with a filter to generate a Direct Current (DC) offset correction, and combining the DC offset correction with the amplifier output, wherein the third chopper output is driven to the output voltage of the filter and the RRL is disconnected from the low frequency signal path in response to a non-linear event.