Reference Voltage Generator With Adjustable Resistors
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Solution Overview
Problem
Existing reference voltage generators often fail to maintain a constant voltage difference between multiple reference voltages across varying voltage levels, which can disrupt voltage ratios within and between circuits, necessitating effective calibration in devices like memory systems.
Innovation Solution
A multiplexer and operational amplifier configuration with adjustable resistors and a voltage divider system that maintains a constant current through resistors, allowing for the generation of multiple reference voltages with a controlled voltage difference, facilitated by a controller adjusting the resistance to maintain the voltage difference across a range of voltage levels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a plurality of reference voltages are generated using conventional methods, then multiple voltage levels are available for different applications, but the voltage difference between reference voltages varies with voltage levels, disrupting voltage ratios
Solution Approach 1:
The patent employs adjustable resistors that can dynamically change their resistance values based on the voltage level being monitored. This dynamic adjustment ensures that the voltage difference between reference voltages remains constant across varying voltage levels, thereby maintaining stable voltage ratios for different circuit applications.
Solution Approach 2:
The invention changes the resistance parameter of the adjustable resistors in response to voltage level changes. By modifying this physical parameter, the system maintains a constant voltage difference between reference voltages despite variations in the overall voltage level, thus preserving voltage ratio stability across different operating conditions.
2Reliability
If adjustable resistors are used to maintain constant voltage difference, then voltage ratio stability is improved, but device complexity increases
Solution Approach 1:
The adjustable resistors in the patent serve multiple functions: they provide voltage division, enable constant voltage difference maintenance, and adapt to different voltage levels. This multi-functionality reduces the need for separate circuits for each function, thereby limiting the increase in overall device complexity while achieving voltage ratio stability.
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.