Reference Voltage Generator With Constant Voltage Spacing
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Solution Overview
Problem
Existing reference voltage generators often fail to provide multiple reference voltages simultaneously while maintaining a constant voltage difference between them, which is crucial for calibration and operation in various digital and analog applications, especially in memory devices.
Innovation Solution
The proposed solution involves a multiplexer and operational amplifiers configured to receive selected voltages, with a resistor network and adjustable resistors to maintain a constant current, allowing for the generation of multiple reference voltages with a controlled voltage difference, facilitated by a voltage divider and feedback mechanisms.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a single reference voltage generator is used, then the device complexity is reduced, but the ability to provide multiple reference voltages simultaneously is lost
Solution Approach 1:
The patent combines multiple reference voltage generation functions into a single integrated circuit. The first and second reference voltage generators are merged into one device that can simultaneously output multiple reference voltages (VREF1, VREF2, VREF3, VREF4) with constant voltage differences, eliminating the need for separate generator circuits while maintaining functionality.
Solution Approach 2:
The reference voltage generator is designed with multi-functionality to provide different reference voltages based on different operating conditions. The circuit can generate multiple reference voltages (VREF1-VREF4) with constant voltage differences, and the operational amplifiers can be configured in different modes (first mode, second mode) to adapt to various application requirements within a single device.
2Adaptability or versatility
If multiple reference voltage generators are used to provide multiple reference voltages, then the adaptability is improved, but the device complexity increases
Solution Approach 1:
The patent combines multiple reference voltage generation functions into a single integrated circuit. The first and second reference voltage generators are merged into one device that can simultaneously output multiple reference voltages (VREF1, VREF2, VREF3, VREF4) with constant voltage differences, eliminating the need for separate generator circuits while maintaining functionality.
3Manufacturing precision
If the voltage difference between reference voltages varies, then the manufacturing precision is reduced, but the ease of operation is improved
Solution Approach 1:
The patent employs feedback mechanisms through operational amplifiers (OPA1, OPA2) that continuously monitor and adjust the voltage differences between reference outputs. The feedback loops ensure that voltage differences (VREF1-VREF2 and VREF3-VREF4) remain constant despite variations in input voltage or loading conditions, maintaining manufacturing precision while allowing operational flexibility.
Solution Approach 2:
The circuit utilizes parameter changes in the operational amplifiers and resistor networks to maintain constant voltage differences. By dynamically adjusting internal parameters through feedback control, the system preserves the constant voltage difference relationship across different operating conditions, resolving the contradiction between precision and operational ease.
Data Source
AI summary
A reference voltage generator is disclosed that may provide a plurality of reference voltages. A reference voltage generator may include a voltage divider, a multiplexer coupled to the voltage divider, an operational amplifier that may receive a voltage from the multiplexer, and a plurality of resistors that may receive an output from the operational amplifier. The reference voltages may be provided from output terminals coupled to the resistors. A reference voltage generator may include a voltage divider, two multiplexers coupled to the voltage divider, an operational amplifier coupled to each multiplexer, and a plurality of resistors coupled between the outputs of the two operational amplifiers. Reference voltages may be provided from output terminals coupled to the resistors.