Voltage Regulation Circuit Using Source Follower Feedback
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Solution Overview
Problem
Conventional voltage regulation circuits in portable devices require external stabilizing capacitors, increasing physical size and production cost, and fail to efficiently manage instantaneous current variations.
Innovation Solution
A voltage regulation circuit utilizing a source follower with a differential input unit, driving unit, and feedback loop to generate adjustment voltages, which suppresses instantaneous current without the need for an external stabilizing capacitor, thereby reducing size and cost.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an external stabilizing capacitor is added to the voltage regulation circuit, then the stability requirement is met and instantaneous response current is prevented, but the physical size and production cost increase
Solution Approach 1:
The patent extracts the stabilizing function from the external capacitor and relocates it to an internal capacitor within the voltage regulation circuit. This internal capacitor is strategically positioned to provide the necessary stabilization without requiring additional external components, thereby maintaining stability while reducing physical size.
Solution Approach 2:
The patent merges the stabilizing function with the existing voltage regulation circuit by integrating an internal capacitor into the circuit architecture. This consolidation allows the circuit to achieve both voltage regulation and stabilization functions through a single integrated structure, eliminating the need for separate external capacitors.
2Reliability
If an external stabilizing capacitor is added to the voltage regulation circuit, then the instantaneous response current is prevented, but the production cost increases
Solution Approach 1:
The patent extracts the instantaneous response current control function from external components and implements it internally within the voltage regulation circuit through a carefully designed capacitor network. This internal implementation eliminates the need for additional external capacitors, thereby reducing component count and production cost while maintaining the instantaneous response control capability.
Solution Approach 2:
The patent combines the instantaneous response current control function with the core voltage regulation circuit by integrating an internal capacitor. This merger allows the circuit to achieve both voltage regulation and instantaneous current control through a single integrated structure, reducing the need for separate external components and lowering production costs.
3Device complexity
If a conventional voltage regulation circuit is used without a source follower, then the circuit structure is simpler, but the stabilizing speed is slower and system voltage variation is larger
Solution Approach 1:
The patent introduces a source follower as an intermediary stage between the error amplifier and the pass transistor. This source follower acts as a buffer that provides high input impedance and low output impedance, thereby improving the stabilizing speed and reducing system voltage variation without significantly complicating the overall circuit structure.
Solution Approach 2:
The patent changes the impedance parameters of the voltage regulation circuit by introducing the source follower. The source follower transforms the high output impedance of the error amplifier into a low output impedance that can rapidly respond to load changes, thereby improving stabilizing speed while maintaining reasonable circuit complexity.
Data Source
AI summary
A voltage regulation circuit including a differential input unit, a source follower and a driving unit is provided. The differential input unit has a first input terminal and a second input terminal for receiving a reference voltage and a system voltage respectively. Further, the differential input unit compares the reference voltage and the system voltage and accordingly generates a control voltage. The source follower is electrically connected between the differential input unit and the driving unit, and generates an adjustment voltage according to the control voltage. The differential input unit, the source follower and the driving unit form a feedback loop, so that the driving unit fixes a source voltage to the system voltage according to the adjustment voltage.