Voltage Generation Circuit with Multi-Stage Rectification
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Solution Overview
Problem
Conventional voltage generation circuits, such as the Widlar-type reference voltage generation circuit, experience significant variations in reference voltage due to variations in power supply voltage and characteristics of basic analog circuit components like transistors.
Innovation Solution
A voltage generation circuit with multiple rectification stages and amplification units is implemented, where the first rectification circuit generates a voltage, which is amplified and then rectified again by a second rectification circuit, followed by a current/voltage conversion to produce a stable reference voltage, reducing variations exponentially.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional reference voltage generation circuit is used, then the circuit structure is simple, but the reference voltage varies widely depending on power supply voltage
Solution Approach 1:
The voltage generation circuit is divided into multiple independent stages: first rectification circuit, amplification unit, second rectification circuit, and current/voltage conversion unit. Each stage performs a specific function and can be optimized independently, achieving stable reference voltage output while maintaining reasonable circuit complexity
Solution Approach 2:
The amplification unit receives feedback from the first rectification circuit output and amplifies it to drive the second rectification circuit. This feedback mechanism ensures that variations in power supply voltage are compensated, maintaining stable reference voltage output despite input voltage fluctuations
2Reliability
If multiple rectification stages with amplification are implemented, then reference voltage stability improves, but circuit complexity increases
Solution Approach 1:
The complex voltage generation process is segmented into four functional blocks that can be designed and tested independently. This modular approach allows the system to achieve high reliability through multiple rectification stages while managing complexity through clear functional separation
Solution Approach 2:
The amplification unit changes the voltage level parameter to optimize the operation of subsequent rectification stages. By adjusting voltage parameters at each stage, the circuit achieves stable reference voltage output while maintaining component operation within optimal ranges
Data Source
AI summary
A voltage generation circuit includes: a first and second rectification circuits; and one or more amplification units connected between the first and second rectification circuits and configured to amplify an output of the first rectification circuit and provide the amplified output to the second rectification circuit. The second rectification circuit generates a reference voltage.