Reference Voltage Circuit Reducing Process Variation via Dynamic Switching
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Solution Overview
Problem
Conventional reference voltage generators in electronic devices suffer from variations due to process errors in transistors, leading to labor-intensive manual adjustments and limited effectiveness of choppers in mitigating these variations.
Innovation Solution
A reference voltage generation circuit comprising a voltage supplying circuit, a unit switch circuit, and a voltage output circuit that generates base voltages and modifies the reference voltage to reduce the influence of process errors, using a unit switch operation to dynamically change the configuration of transistor units and adjust the reference voltage to an average value.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a current mirror with two matched transistors is used to generate reference voltage, then the reference voltage can be produced, but process errors cause variation in the reference voltage
Solution Approach 1:
The patent applies dynamics by making the transistor configuration movable and adjustable. Multiple transistor units are configured in different connection states that can be dynamically switched, allowing the circuit to adapt to process variations and optimize the reference voltage output accordingly
Solution Approach 2:
The patent changes the connection parameters of transistor units between different states. By switching transistors between various connection configurations, the circuit adjusts electrical parameters to compensate for process errors and maintain accurate reference voltage
2Manufacturing precision
If manual confirmation is used to check and adjust reference voltage generators, then the reference voltage accuracy can be improved, but labor cost increases significantly
Solution Approach 1:
The patent implements self-service by enabling the reference voltage generation circuit to automatically adjust and optimize its own output. The circuit autonomously switches between different transistor configurations to compensate for process variations, eliminating the need for manual confirmation and adjustment
3Reliability
If a chopper is configured in the reference voltage generator to eliminate variation, then some stabilization is achieved, but the effect is limited
Solution Approach 1:
The patent uses dynamics to create a more effective solution than static chopper stabilization. By dynamically switching between multiple transistor unit configurations, the circuit achieves better compensation for process variations while maintaining a relatively simple structure
Data Source
AI summary
An exemplary embodiment of the disclosure provides a reference voltage generation circuit which includes a unit switch circuit and a voltage output circuit. The unit switch circuit is configured to receive a control voltage and generate a plurality of base voltages on a detection point inside the reference voltage generation circuit. The voltage output circuit is coupled to the unit switch circuit and is configured to modify a reference voltage for generating a specific voltage according to the base voltages. Therefore, an influence on the reference voltage due to process variation can be reduced.