Voltage Regulator Load Line Calibration for Stable Transient Response
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Solution Overview
Problem
Existing voltage regulators for microprocessors face challenges in accurately calibrating the load line due to deviations between ideal and real-world circuit components, leading to instability and inefficiencies in transient response.
Innovation Solution
A control circuit and method that includes an interface circuit, reference circuit, voltage positioning circuit, and switching control circuit to calibrate the load line by adjusting the voltage positioning signal and feedback currents, ensuring the load line matches the target load line within specified tolerances.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If traditional AVP control is used to reduce voltage deviations during load steps, then system stability is improved, but the load line deviates from the target load line due to component tolerances
Solution Approach 1:
The patent applies preliminary action by performing load line calibration before normal operation. The calibration circuit pre-adjusts the voltage positioning signal based on stored calibration data, ensuring the load line is accurately positioned before the voltage regulator begins operating. This preliminary calibration compensates for component tolerances and ensures the load line matches the target load line, resolving the contradiction between stability and calibration accuracy.
Solution Approach 2:
The patent implements feedback through a calibration circuit that compares the actual voltage positioning signal with a calibrated reference value. The calibration data is stored in memory and used to adjust the voltage positioning signal, creating a closed-loop system that compensates for deviations caused by component tolerances. This feedback mechanism ensures the load line accurately follows the target load line while maintaining system stability.
2Speed
If voltage positioning data is used to control the load line slope, then transient response is improved, but deviations from the target load line occur due to real-world component variations
Solution Approach 1:
The patent applies parameter changes by adjusting the voltage positioning signal based on calibration data stored in memory. The calibration circuit modifies the voltage positioning parameter to compensate for component tolerances, ensuring the load line slope accurately matches the target slope. This allows the system to achieve fast transient response while maintaining precise load line matching despite real-world component variations.
Solution Approach 2:
The patent uses copying by storing calibrated voltage positioning data in memory and using this copied reference information to adjust the actual voltage positioning signal. The calibration circuit reads the stored calibration data and applies it to compensate for component variations, creating an accurate copy of the ideal load line characteristics in the actual circuit, thereby achieving both fast transient response and precise load line matching.
3Manufacturing precision
If calibration circuits are added to improve load line accuracy, then manufacturing precision is improved, but device complexity increases
Solution Approach 1:
The patent applies merging by integrating the calibration circuit functionality into the existing voltage regulator control circuit. The calibration circuit shares components with the normal operation circuit, and the calibration data is stored in the same memory structure used for voltage positioning. This merging approach improves load line calibration accuracy while minimizing the increase in device complexity by reusing existing circuit elements.
Solution Approach 2:
The patent implements universality by designing the calibration circuit to perform multiple functions: it calibrates the load line during initialization, stores calibration data in memory, and provides ongoing compensation during normal operation. The same circuit components serve both calibration and normal voltage regulation functions, reducing the need for separate dedicated calibration hardware and thereby limiting the increase in device complexity while improving load line accuracy.
Data Source
AI summary
A control circuit of a voltage regulator has an interface circuit, a reference circuit, a voltage positioning circuit, and a switching control circuit. The reference circuit provides a reference voltage based on a voltage setting data received by the interface circuit. The voltage positioning circuit provides a voltage positioning signal based on a voltage positioning data received by the interface circuit and an output current. The switching control circuit provides a plurality of switching control signals based on the reference voltage, the voltage positioning signal and an output voltage to control a plurality of switching circuits. The voltage positioning circuit calibrates the voltage positioning signal in response to the voltage positioning data.