Power Supply Equalization Unit for PDN Stability
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Solution Overview
Problem
Regulated power supplies face challenges in maintaining stability and bandwidth due to the impact of power delivery networks, particularly at high frequencies, which affects the precision and stability of the power supply.
Innovation Solution
Incorporating an equalization unit within the power supply that adds poles and/or zeros to the transfer function to compensate for the effects of the power delivery network, using a current mode forward amplifier for efficient space and power usage, and reducing the load capacitor to enhance bandwidth and reduce PCB space.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the power delivery network is used to provide power to the load, then the power supply can deliver power to the load, but the PDN adds a pole and/or zero to the transfer function which impacts the stability of the power supply at high frequencies
Solution Approach 1:
An equalization unit is introduced as an intermediary component between the power converter and the load. This unit modifies the transfer function by adding compensating poles and/or zeros that counteract the adverse effects of the PDN's pole and/or zero, thereby maintaining stability while preserving power delivery capability
Solution Approach 2:
The equalization unit changes the parameters of the transfer function by introducing additional poles and/or zeros at specific frequencies. This parameter modification allows the system to compensate for the PDN's frequency-dependent effects and maintain stability across the operating bandwidth
2Device complexity
If traditional power supply design is used, then the design is simple and cost-effective, but the bandwidth is limited due to the impact of the power delivery network
Solution Approach 1:
The equalization unit serves as a mediator that enables bandwidth extension without requiring complete redesign of the power supply architecture. It selectively modifies the transfer function characteristics to achieve higher bandwidth while maintaining the overall simplicity of the design
Solution Approach 2:
Rather than completely redesigning the power supply for high bandwidth performance, the equalization unit applies partial correction by adding specific poles and/or zeros only where needed to compensate for PDN effects, achieving bandwidth extension with minimal additional complexity
Data Source
AI summary
A power supply and a method to provide power to a load via a power delivery network are presented. The power delivery network adds a pole and/or zero to a transfer function of the power supply. The power supply has a feedback unit to sense a load voltage at the load and to provide a feedback voltage which is indicative of the load voltage. The power supply has an input amplifier provides an error voltage based on the feedback voltage. The power supply has a power converter to provide power to the power delivery network depending on the error voltage. The power supply has an equalization unit to add a zero and/or a pole to the transfer function of the power supply, such that the pole and/or zero of the power delivery network is partially compensated. The equalization unit is located between an input amplifier and a power converter.