Voltage Regulator High-Impedance Block Wake-Up Time
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Solution Overview
Problem
Conventional voltage regulators experience lengthy wake-up times and variations due to process, temperature, and voltage fluctuations, leading to inefficient power consumption and potential overshooting of the desired voltage level.
Innovation Solution
The integration of a high-impedance block in the regulator circuit, which provides a constant current for pulling down the output voltage, reducing wake-up times and power consumption by preventing rapid voltage drops and overshooting, thereby stabilizing the output voltage more efficiently.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If conventional voltage regulator circuits are used, then the regulator can provide voltage regulation function, but the wake-up time is lengthy and power consumption is high
Solution Approach 1:
The regulator circuit is divided into two operational modes: a first mode during wake-up/transient conditions where the high-impedance block is disabled allowing rapid voltage changes, and a second mode during steady-state operation where the high-impedance block is enabled to provide constant current and reduce power consumption. This segmentation allows the circuit to optimize performance for different operating conditions separately.
Solution Approach 2:
The high-impedance block is dynamically controlled through a control signal that switches it between enabled and disabled states based on operating conditions. During wake-up, the block is disabled to allow fast voltage transitions; during steady-state, it is enabled to provide constant current and reduce power consumption. This dynamic adaptation resolves the contradiction between fast wake-up and low power consumption.
2Stability of the object's composition
If conventional voltage regulator circuits are used, then the regulator can output voltage, but the output voltage may overshoot the desired level causing instability
Solution Approach 1:
The high-impedance block provides preliminary anti-action by preparing a constant current path that opposes rapid voltage changes. When enabled, it prevents the output voltage from overshooting the desired level by providing a controlled current sink that counteracts excessive voltage rise, thereby improving both stability and precision.
Solution Approach 2:
The circuit uses feedback through comparators that monitor the output voltage and generate control signals to adjust the high-impedance block's operation. When the output voltage approaches the desired level, the feedback mechanism activates the high-impedance block to prevent overshooting, ensuring precise voltage regulation and stability.
Data Source
AI summary
A regulating circuit includes a first comparator configured to control a turning on and a turning off of a first transistor based on a first comparison a reference voltage to a feedback voltage. The first transistor is coupled between an output node and a first voltage supply. A second comparator is configured to control a turning on and a turning off of a second transistor based on a second comparison of the reference voltage to the feedback voltage. The second transistor is coupled to the output node. A high-impedance circuit is coupled in series with the second transistor such that the high-impedance block is disposed between the second transistor and a second power supply. The high-impedance circuit is configured to generate a constant current between the output node and the second voltage supply when the second transistor is turned on.