Instrumentation Amplifier Feedback Circuit for Fast Stable Voltage Regulation
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Solution Overview
Problem
Multiphase buck converters face issues with voltage spikes due to changes in load, which can trigger overvoltage protection and reduce the lifespan of electronic devices, and existing amplifiers are complex and costly to meet the required specifications of high bandwidth, low output impedance, high input impedance, and quick startup.
Innovation Solution
A streamlined amplifier design with high input impedance and low output impedance, utilizing a feedback differential pair to achieve constant gain and rapid startup, reducing the complexity and area size by using fewer components and transistors, and implementing negative feedback to lower output impedance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If existing amplifiers are used to meet high bandwidth, low output impedance, high input impedance, and quick startup specifications, then the required performance is achieved, but the device complexity and area size increase
Solution Approach 1:
The patent combines the functions of multiple amplifiers into a single streamlined amplifier design. The instrumentation amplifier integrates differential input stages, buffering, and output stages in one unified circuit, eliminating the need for separate operational amplifiers and reducing overall device complexity while maintaining high bandwidth, low output impedance, and quick startup performance
Solution Approach 2:
The streamlined amplifier is designed to perform multiple functions simultaneously: it provides high input impedance for signal buffering, achieves low output impedance for driving loads, delivers high bandwidth for fast response, and enables quick startup for rapid operation. This multi-functional design eliminates the need for multiple specialized components
2Speed
If multiphase buck converters operate at equally spaced intervals to respond quickly to load changes, then the response speed is improved, but voltage spikes occur causing overvoltage protection triggering
Solution Approach 1:
The patent implements a feedback control mechanism using the streamlined amplifier to monitor output voltage and adjust the buck converter operation accordingly. The amplifier compares the actual output voltage with the reference voltage and generates an error signal that controls the PWM duty cycle, preventing voltage spikes while maintaining fast response to load changes
Solution Approach 2:
The patent employs dynamic phase adjustment in the multiphase buck converter where the phase intervals between multiple buck converters are not fixed but can be dynamically adjusted. This allows the system to optimize the switching时序 to minimize voltage spikes while maintaining quick response to load changes, making the system adaptable to different operating conditions
Data Source
AI summary
A feedback network has a feedback output terminal. A digital to analog converter has an analog output terminal. An amplifier includes an input differential pair having an inverting input terminal, a non-inverting input terminal, a first output current terminal and a second output current terminal. The inverting input terminal is coupled to the feedback output terminal, and the non-inverting input terminal is coupled to the analog output terminal. The amplifier includes a feedback differential pair having a third output current terminal, a fourth output current terminal, a first input terminal and a second input terminal. The third output current terminal is coupled to the first output current terminal, and the fourth output current terminal is coupled to the second output current terminal. The amplifier includes an amplifier output terminal coupled to the first input terminal and the second input terminal.