Voltage Regulator Compensation Circuit PSRR
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Solution Overview
Problem
Existing voltage regulators fail to simultaneously achieve good power supply rejection ratio (PSRR) and drive both high and low output voltages effectively.
Innovation Solution
A voltage regulator design incorporating a resistive circuit, driver circuit, and compensation circuit, where the compensation circuit uses a diode-connected transistor to apply a power supply voltage lower than the predetermined voltage, improving PSRR and enabling operation at both high and low output voltages.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional voltage regulator design is used, then the circuit structure is simple, but the power supply rejection ratio (PSRR) is poor and it cannot drive both high and low output voltages effectively
Solution Approach 1:
The voltage regulator is divided into multiple functional modules: a compensation circuit with a diode-connected transistor to generate a stable power supply voltage, a resistive circuit with multiple resistors to generate divided voltages, and driver circuits to control the switching elements. This segmentation allows each module to be optimized independently, improving PSRR while maintaining manageable complexity.
Solution Approach 2:
A compensation circuit using a diode-connected transistor is introduced as an intermediary element to generate a stable power supply voltage that is less sensitive to input voltage variations. This intermediary circuit acts as a buffer between the power supply and the regulation stage, significantly improving the power supply rejection ratio.
2Adaptability or versatility
If the voltage regulator is designed to drive both high and low output voltages, then the output voltage range is extended, but the power supply rejection ratio deteriorates
Solution Approach 1:
The voltage regulator employs driver circuits that dynamically control the switching elements based on the required output voltage level. The driver circuits can adjust their operation to accommodate both high and low output voltages while maintaining stable regulation. This dynamic control allows the regulator to adapt to different voltage requirements without compromising PSRR.
Solution Approach 2:
The regulator changes its operating parameters by using different resistance ratios in the resistive circuit and adjusting the control signals to the driver circuits. This allows the same circuit structure to regulate both high and low output voltages effectively while maintaining good power supply rejection ratio through proper parameter selection.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution enhances PSRR and allows the voltage regulator to drive both high and low output voltages, addressing the limitations of existing regulators by reducing voltage fluctuations and ensuring reliable operation across varying voltage levels.
Implementation Method 1
The compensation circuit may include a diode-connected transistor, which has a first terminal, a second terminal, and a gate terminal, the first terminal receives the predetermined voltage, the second terminal and the gate terminal are diode-connected to each other, and the compensation circuit may apply the power supply voltage to the at least one driver circuit through the second terminal and the gate terminal. The power supply voltage may be lower than the predetermined voltage by a diode forward voltage drop.
Data Source
AI summary
A voltage regulator and a memory device including same are provided. The voltage provider includes a resistive circuit configured to output at least one divided voltage; at least one driver circuit configured to be connected to the resistive circuit and to set the at least one divided voltage; and a compensation circuit configured to be connected to the at least one driver circuit, to receive a predetermined voltage, and to apply a power supply voltage to the at least one driver circuit. The at least one driver circuit may set the at least one divided voltage based on the power supply voltage received from the compensation circuit.