PMIC Voltage Monitoring With Violation Counting for Power Integrity
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Solution Overview
Problem
Power management integrated circuits (PMICs) face challenges in maintaining power integrity due to various factors such as operating environment, operational status, workload, and operating frequency, which can impact the reliability of power supply voltages in semiconductor systems.
Innovation Solution
A PMIC is designed with a voltage regulator, a monitoring circuit, and a count register to generate and regulate output voltages, monitor feedback voltages at periodic intervals, and store count values of voltage range violations, enabling external monitoring and data transmission to maintain power integrity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a PMIC regulates power supply voltage without monitoring, then the device complexity is reduced, but the power integrity and reliability deteriorate due to undetected voltage deviations
Solution Approach 1:
The patent implements a feedback mechanism where a monitoring circuit continuously compares the feedback voltage (representing output voltage) against reference voltages to detect deviations. The count register accumulates violation events and provides feedback to the host system, enabling closed-loop power integrity management without requiring complex external monitoring hardware.
Solution Approach 2:
The PMIC performs self-monitoring of its own output voltage through the integrated monitoring circuit and count register. This self-service capability allows the power management device to autonomously detect and report voltage deviations, eliminating the need for separate external monitoring systems and reducing overall system complexity while maintaining high reliability.
2Measurement precision
If voltage monitoring is implemented continuously without periodic intervals, then the measurement precision of voltage deviations is improved, but the use of energy increases due to constant monitoring operations
Solution Approach 1:
The monitoring circuit operates at periodic intervals determined by a prescaler and counter mechanism rather than continuously. The system counts clock cycles to trigger monitoring events, achieving adequate detection precision for power integrity applications while significantly reducing energy consumption compared to continuous monitoring. This periodic operation balances measurement accuracy with power efficiency.
3Loss of information
If the count register stores detailed violation data, then the loss of information is reduced, but the device complexity increases due to additional storage and processing requirements
Solution Approach 1:
The patent extracts only the essential information (count of voltage violations) from the monitoring data and stores it in a compact count register. Detailed waveform and timing information is excluded from storage, as it is not necessary for power integrity assessment. This selective information retention minimizes storage requirements and processing complexity while maintaining sufficient data for reliability evaluation.
Solution Approach 2:
The system transforms continuous voltage deviation information into a discrete parameter (violation count) that can be stored in a simple register. This parameter transformation simplifies data storage and processing while preserving the essential information needed to assess power integrity and trigger appropriate responses.
4Reliability
If the PMIC operates without voltage threshold monitoring, then the ease of operation is improved, but the reliability deteriorates due to inability to detect voltage range violations
Solution Approach 1:
The monitoring circuit provides automated feedback when voltage deviations occur, comparing feedback voltage against predefined thresholds and triggering violation counting. This feedback mechanism automatically detects and reports power integrity issues without requiring manual intervention or complex operational procedures, maintaining ease of operation while significantly improving reliability through continuous automated monitoring.
Data Source
AI summary
A power management integrated circuit (PMIC) includes a voltage regulator, a monitoring circuit, and a count register. The voltage regulator is configured to generate an output voltage. The monitoring circuit is configured to receive a feedback voltage of the output voltage, and to determine at each of periodic intervals whether the feedback voltage is outside a threshold voltage range. The count register is configured to store a count value indicative of a number of times the feedback voltage is determined by the monitoring circuit to be outside the threshold voltage range.