On-Chip Regulator Short Detection for Stable PLL Voltage
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Solution Overview
Problem
Integrated circuits face challenges in detecting output power-ground shorts in on-chip voltage regulators, particularly in advanced technologies like 5 nm and lower, where deep trench capacitors are not available, leading to susceptibility of power supply output VRA capacitors to shorts, which can cause noise and affect PLL circuit performance.
Innovation Solution
A system and method using a voltage divider, comparators, and error and control logic to detect threshold voltage offsets, providing warning notifications before output voltage drops below the minimum required level, and implementing a chip test mode to limit output current for early detection of power-ground shorts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If diffusion capacitance and metal capacitance are used to implement power supply output VRA capacitors in 5 nm and lower IC technologies, then the capacitors can be manufactured in advanced technologies, but they become susceptible to metals shorting together causing output power-ground shorts
Solution Approach 1:
The patent implements a detection mechanism that performs preliminary monitoring of the output voltage to detect power-ground shorts before they cause complete system failure. The comparator continuously compares the regulator output voltage against a reference voltage, and the error and control logic detects threshold voltage offsets that indicate a short condition, enabling early warning and corrective action.
Solution Approach 2:
The patent introduces an intermediary detection system consisting of a comparator and error/control logic that mediates between the voltage regulator output and the system. This intermediary mechanism monitors the output voltage and provides early detection of power-ground shorts by comparing the output voltage against a reference, enabling detection before complete failure occurs.
2Difficulty of detecting and measuring
If output voltage droop is allowed to occur, then power-ground shorts can be detected through voltage offset, but the output voltage may drop below the minimum required level affecting PLL circuit performance
Solution Approach 1:
The detection mechanism performs preliminary detection of power-ground shorts by monitoring for threshold voltage offsets before the output voltage droop becomes severe enough to affect PLL circuit performance. The error and control logic identifies short conditions at early stages, enabling corrective action before the voltage drops below minimum required levels.
Solution Approach 2:
The patent implements a feedback mechanism where the comparator continuously compares the regulator output voltage against a reference voltage, and the error and control logic receives feedback about threshold voltage offsets. This feedback enables real-time detection of power-ground shorts while the voltage regulator maintains stable output voltage, allowing detection without compromising voltage stability for PLL circuits.
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
Enables timely corrective actions such as repair or replacement, ensuring reliable operation of PLL circuits by detecting both initial and progressive power-ground shorts, preventing failure and maintaining stable output voltage.
Implementation Method 1
comparing, by a comparator, an output voltage of an on-chip voltage regulator, and a predefined voltage reference to detect a threshold voltage offset
Implementation Method 2
forming a voltage divider by a plurality of series-connected resistors connected between a voltage reference received by the on-chip voltage regulator and a ground potential, to provide a respective predefined voltage reference at respective taps between the series-connected resistors
Data Source
AI summary
Embodiments of the present disclosure provide enhanced systems and methods for detecting output power-ground shorts in on-chip voltage regulators, such as used for phase-locked loop (PLL) circuits in integrated circuit (IC) chips. A disclosed regulator output power-ground short detector can detect both initial output power-ground shorts of the on-chip voltage regulator including initial high resistance output power-ground shorts, and output power-ground shorts that can occur in a user's environment and degrade over time for example, resulting from a degrading or failing output voltage regulator analog (VRA) capacitor. In an embodiment, the regulator output power-ground short detector detects predefined threshold voltage offsets of a degraded power-ground short over time, and transmits warning notifications that enable corrective actions, such as repair or replacement before failure of the PLL circuits.