Temperature-Compensated LDO Regulation for Stable Memory Voltage
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Solution Overview
Problem
Traditional LDO regulators struggle to provide a stable output voltage with fast transient response and low leakage current, especially in applications requiring high performance and varying load conditions, such as memory devices.
Innovation Solution
Incorporating output level clamper sets, power gate switches, and a two-step wake-up mechanism to dynamically monitor and adjust output voltage levels, reducing settling time and leakage by using pull-up, pull-down circuits, and charge injectors, along with distributed control circuits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional LDO regulators are used, then the circuit structure is simple, but the output voltage stability and transient response are insufficient
Solution Approach 1:
The regulator is divided into multiple functional modules: error amplifier, reference voltage generator, temperature compensation circuit, output clamper sets, and power gate switches. Each module performs a specific function to collectively achieve stable output voltage while managing complexity through modular design.
Solution Approach 2:
The output clamper sets dynamically adjust the output voltage level based on load conditions. The power gate switches transition between different states (on/off) to control power delivery, enabling fast transient response to load changes while maintaining overall system stability.
2Loss of energy
If traditional LDO regulators are used, then the leakage current is high, but adding more control circuits increases complexity
Solution Approach 1:
The power gate switches are closed in advance before the main regulator activates, pre-establishing the power delivery path. This preliminary action allows the regulator to wake up faster and reduces the time during which leakage current flows, thereby reducing energy loss without requiring continuous complex control.
Solution Approach 2:
The error amplifier continuously monitors the output voltage and adjusts the control signal to the power transistor accordingly. This feedback mechanism maintains stable output voltage while minimizing unnecessary power dissipation and leakage current through precise control.
3Measurement precision
If output voltage is regulated with high precision, then the transient response becomes slow, but reducing precision affects stability
Solution Approach 1:
The output clamper sets provide dynamic voltage adjustment capability. When load changes occur, the clampers can rapidly shift the output voltage level, providing fast transient response. The error amplifier then fine-tunes the voltage to maintain precision, combining speed and accuracy through coordinated operation of different modules.
4Loss of energy
If power gate switches are used for wake-up control, then the leakage is reduced, but the device complexity increases
Solution Approach 1:
The power gate switches are closed in advance before the main regulator activates, pre-establishing the power delivery path. This preliminary action allows the regulator to wake up faster and reduces the time during which leakage current flows, thereby reducing energy loss without requiring continuous complex control.
Data Source
AI summary
A power regulation system including a reference generator, a temperature compensation circuit coupled to the reference generator, and a low-dropout (LDO) regulator circuit coupled to the temperature compensation circuit, wherein the temperature compensation circuit provides a reference voltage to the LDO regulator circuit at least based on a ratio of a first current and a second current.