Reference Voltage Generator for Constant-Spacing Multi-Voltage Output
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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 across varying voltage levels, which is crucial for calibration and operation in digital-to-analog and analog-to-digital applications, particularly in memory devices.
Innovation Solution
The proposed solution involves a reference voltage generator apparatus that includes a multiplexer, operational amplifiers, and resistors configured to provide multiple reference voltages with a constant voltage difference, using a voltage divider to control voltage levels and maintain a constant current through the resistors, ensuring stability across a range of voltages.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If a single reference voltage is generated using conventional methods, then the circuit is simple, but multiple reference voltages with constant voltage difference cannot be provided simultaneously
Solution Approach 1:
The voltage divider is segmented into multiple resistors (R1, R2, R3, R4) that can be independently controlled through switches (S1, S2, S3, S4). This segmentation allows different portions of the voltage divider to be activated selectively, enabling multiple reference voltages to be generated simultaneously from a single input voltage while maintaining constant voltage differences between them.
Solution Approach 2:
A single voltage divider circuit serves multiple functions by providing multiple reference voltages (Vref1, Vref2, Vref3, Vref4) simultaneously. The operational amplifier and switch network enable this universal structure to generate different reference voltage levels based on switch configuration, eliminating the need for separate voltage generation circuits for each reference voltage.
2Adaptability or versatility
If voltage levels vary, then adaptability is improved, but maintaining constant voltage difference becomes difficult
Solution Approach 1:
The operational amplifier is configured with feedback connections that monitor the voltage differences between adjacent reference voltages. This feedback mechanism automatically adjusts the switch states to maintain constant voltage differences (Vref1-Vref2, Vref2-Vref3, Vref3-Vref4) even when the input voltage level changes, ensuring stability while adapting to different voltage conditions.
Solution Approach 2:
The switch network (S1, S2, S3, S4) dynamically reconfigures the voltage divider connections based on the desired reference voltage levels. This dynamic switching allows the circuit to adapt to different input voltage conditions while maintaining the constant voltage difference property through coordinated switch state changes controlled by the operational amplifier.
3Adaptability or versatility
If multiple reference voltages are generated simultaneously, then calibration capability is improved, but response time may increase
Solution Approach 1:
The voltage divider and switch network are pre-configured to provide multiple reference voltage levels simultaneously. When calibration is needed, the appropriate reference voltages are already available at the output terminals, eliminating the need for sequential generation or adjustment. This preliminary preparation of multiple voltage levels enables fast calibration by simply selecting the required reference voltages through switch control.
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.