Adaptive Pull-Down Circuitry for Voltage Regulator Overshoot Control
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Solution Overview
Problem
Conventional voltage regulation techniques fail to adaptively manage overshoot and undershoot conditions in processor supply voltage, leading to potential processor resets due to unsuitable constant duration pull-down control in varying environmental conditions.
Innovation Solution
A regulator circuit with adaptive pull-down circuitry that draws current based on comparison between output voltage and reference voltages, using a band gap reference, to control the turn-on and turn-off times of a pull-down transistor, reducing the likelihood of undershoot conditions by dynamically responding to environmental variations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a state machine controls pull-down for a predetermined constant duration, then the overshoot condition is reduced, but the solution becomes unsuitable when environmental conditions (process, voltage, temperature) vary
Solution Approach 1:
The patent implements dynamic pull-down control where the duration and intensity of pull-down current are adjusted in real-time based on feedback from voltage detection circuits. Instead of fixed constant-duration pull-down, the system continuously monitors output voltage and adapts the pull-down transistor control signals dynamically to maintain stability across varying environmental conditions
Solution Approach 2:
The system employs feedback mechanisms where detection circuits monitor the output voltage during transient conditions and feed this information back to the control logic. This feedback enables the state machine to adjust pull-down duration and intensity based on actual voltage conditions rather than relying on predetermined fixed values, thereby maintaining reliability across process, voltage, and temperature variations
2Reliability
If pull-down circuitry draws current for a fixed predetermined duration, then the overshoot is controlled, but undershoot conditions may occur due to mismatched timing in varying environmental conditions
Solution Approach 1:
The pull-down circuitry transitions from fixed-duration control to dynamic control where the duration is determined by real-time voltage monitoring. The system adjusts the pull-down transistor gate control signals based on detected voltage levels, ensuring the pull-down operation lasts exactly as long as needed to prevent overshoot without causing undershoot, adapting automatically to environmental variations
3Reliability
If conventional techniques are used to reduce overshoot, then the overshoot condition is mitigated, but the regulator loop control experiences disruption and slower settling
Solution Approach 1:
The patent maintains continuous regulator loop control operation during transient events by seamlessly integrating pull-down control with the existing feedback loop. The pull-down transistor is controlled in coordination with the regulator's error amplifier and feedback network, ensuring uninterrupted voltage regulation and faster settling compared to conventional techniques that temporarily disrupt the control loop
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 adaptive control of the pull-down circuitry reduces the likelihood of undershoot conditions and minimizes disruption to the regulator loop control, ensuring faster settling and stability of the output voltage across different environmental conditions.
Implementation Method 1
The first and second reference voltages are based upon a same band gap reference as one another
Implementation Method 2
In response to the output voltage rising above a second reference voltage, pull down circuitry draws current from the line
Data Source
AI summary
In response to a first reference voltage, a regulator regulates an output voltage of a line, so that the output voltage is approximately equal to a target voltage. In response to the output voltage rising above a second reference voltage, pull down circuitry draws current from the line. In response to the output voltage falling below the second reference voltage by at least a predetermined amount, the pull down circuitry ceases to draw current from the line. The first and second reference voltages are based upon a same band gap reference as one another.