Reference Voltage Generating Circuit for Semiconductor Devices
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Solution Overview
Problem
Conventional semiconductor devices with reference voltage generating circuits face challenges in maintaining a stable reference voltage immune to temperature changes and variations in power supply voltage, particularly in quickly generating and stabilizing the reference voltage.
Innovation Solution
A semiconductor device with a reference voltage generating circuit that includes first and second resistor parts connected in series between power supplies, an output node, a feedback node, and a voltage control circuit to maintain the feedback node at a constant level, using the reference voltage and feedback node voltages to stabilize the output node voltage, reducing dependence on the power supply voltage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If a reference voltage generating circuit uses a simple resistor divider configuration, then the circuit can quickly generate the reference voltage, but the reference voltage changes greatly when the power supply voltage varies
Solution Approach 1:
The patent introduces a feedback mechanism where a feedback node monitors the reference voltage output and feeds it back to a control circuit. The control circuit adjusts the resistor parts based on the feedback signal to compensate for power supply voltage variations, thereby maintaining stable reference voltage output while preserving fast generation capability
Solution Approach 2:
The patent dynamically changes the resistance values of the resistor parts based on power supply voltage conditions. By adjusting the resistance parameters in response to power supply variations, the circuit maintains a stable reference voltage output while preserving the ability to quickly generate voltage when needed
2Reliability
If a reference voltage generating circuit uses a complex feedback control mechanism, then the reference voltage becomes stable against power supply variations, but the circuit complexity increases
Solution Approach 1:
The patent implements a feedback loop that connects the reference voltage output back to the input through a feedback node. This feedback mechanism enables automatic adjustment of the resistor parts to compensate for power supply variations, achieving stable reference voltage with minimal additional circuit complexity
Solution Approach 2:
The patent designs the control circuit to perform multiple functions: it monitors the reference voltage, compares it with a reference level, and adjusts the resistor parts accordingly. This multi-functional approach achieves stable reference voltage generation without requiring separate dedicated circuits for each function, thereby limiting the increase in overall circuit complexity
Data Source
AI summary
The present invention is a semiconductor device including: a resistor R11 (first resistor part) and an FET 15 (second resistor part) connected in series between a power supply Vcc (first power supply) and ground (second power supply); an output node N11 provided between the resistor R11 and FET 15 and used for outputting a reference voltage; a feedback node N12 provided between the power supply Vcc and the ground; and a voltage control circuit (19) that maintains a voltage of the feedback node N12 at a constant level by using the reference voltage of the output node N11 and the voltage of the feedback node N12. The present invention can provide a semiconductor device having a reference voltage generating circuit capable of generating the reference voltage that does not greatly depend on a power supply voltage and its control method.