Voltage Regulator Circuit with Standby and Active Amplifiers
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Solution Overview
Problem
Existing voltage regulator circuits fail to respond quickly to load current transients and introduce switching noise and jitter, necessitating a solution with improved stability and response time.
Innovation Solution
A voltage regulator circuit incorporating a standby amplifier with an output coupled to the gate of an output transistor, an active open control amplifier with an output coupled to both the output and replica follower transistors, and a capacitor between the chip enable signal and the output transistor, allowing for fast response and stability through a closed loop feedback path.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If a closed loop amplifier system is used in standby mode and non-linear amplifier system in active mode, then response time is improved, but switching noise and jitter are introduced
Solution Approach 1:
The voltage regulator circuit is divided into two distinct amplifier systems: a closed loop amplifier for standby mode and a non-linear amplifier for active mode. Each amplifier is optimized for its specific operating condition, allowing the circuit to achieve fast response time when needed while maintaining stability during normal operation.
Solution Approach 2:
The circuit dynamically switches between two different amplifier configurations based on the operational mode (standby or active). This dynamic adaptation allows the system to optimize performance for each mode independently, achieving fast transient response during mode transitions while minimizing noise during steady-state operation.
2Power
If a closed loop amplifier works in standby mode and high current amplifier in active mode, then current handling capability is improved, but response to load current transients is slow
Solution Approach 1:
The amplifier system is segmented into a standby amplifier optimized for low-power operation and a non-linear amplifier optimized for high-current transient response. This segmentation allows each amplifier to be specifically designed for its intended function without compromise.
Solution Approach 2:
The non-linear amplifier is pre-configured and ready to immediately respond to load current transients when needed, rather than waiting for the closed loop amplifier to react. This preliminary preparation of the high-current path enables fast response to sudden load changes.
Data Source
AI summary
A voltage regulator circuit has a standby amplifier with an output coupled to a gate of an output transistor. An active amplifier has an output coupled to the gate of the output transistor and to a gate of a replica follower transistor. A voltage regulated output is coupled to a source of the output transistor.