Switching Regulator Reference Compensation Module
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Solution Overview
Problem
Switching regulators face performance degradation due to offset voltage influencing the reference signal, leading to poor load regulation, particularly when output current changes, and existing solutions either require additional ground pins or expensive bonding techniques.
Innovation Solution
A switching regulator circuit with a reference compensation module that compensates the average offset voltage by using a reference compensation signal proportional to the output current, canceling out the offset from the reference signal with respect to the package ground pin.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a separate ground pin is provided for the switch module, then the reference signal is unaffected by output current, but the cost and size of the switching regulator increase
Solution Approach 1:
The patent extracts the harmful offset voltage component from the reference signal by introducing a compensation circuit that generates an equal and opposite voltage to cancel the offset, thereby removing the harmful effect without adding physical separation (separate ground pins)
Solution Approach 2:
The patent introduces a compensation circuit as an intermediary element that mediates between the offset voltage source and the reference signal, generating a compensating voltage that offsets the harmful effect without requiring structural changes to the ground connection
2Measurement precision
If Chip Scale or flip-chip bonding is used to reduce parasitic resistance, then the resistance is reduced, but the manufacturing cost and area increase due to low mechanical density
Solution Approach 1:
The patent replaces the mechanical approach of reducing resistance through advanced bonding techniques (Chip Scale/flip-chip) with an electrical approach using a compensation circuit that actively cancels the voltage offset caused by parasitic resistance, avoiding the need for expensive low-resistance bonding methods
3Power
If the output current increases, then the power delivery improves, but the average offset voltage increases leading to degraded load regulation
Solution Approach 1:
The patent implements a feedback mechanism where the compensation circuit monitors the offset voltage (which varies with output current) and generates a compensating signal that dynamically adjusts to cancel the offset, thereby maintaining reference signal accuracy across varying load conditions
Solution Approach 2:
The patent creates a composite reference signal by combining the original reference voltage with a compensating voltage signal, forming a new composite signal that has the harmful offset component removed while preserving the useful reference functionality
Data Source
AI summary
A switching regulator circuit and a reference compensation module employed for compensating a reference signal in the switching regulator circuit. The switching regulator circuit with a reference ground having an average offset voltage referenced to a package ground pin, wherein the average offset voltage is proportional to an output current of the switching regulator circuit with a first factor. The reference compensation module may be configured to receive a second reference signal having a bandgap reference voltage with respect to the reference ground and a reference compensation signal proportional to the output current with a second factor, and configured to provide the first reference signal based on compensating the second reference signal with the reference compensation signal to substantially cancel out the average offset voltage from the first reference signal with respect to the ground pin.