Resonant Frequency Detection in Power Delivery Networks
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Solution Overview
Problem
Existing techniques for detecting resonant frequencies causing impedance peaks in power delivery networks are costly and inefficient, requiring dedicated voltage sense pins and off-chip measurement circuits, which can lead to performance issues and faults in data processing systems due to discrepancies between calculated and actual resonant frequencies.
Innovation Solution
An apparatus and method utilizing resonant frequency detection circuitry with test frequency control circuitry and a loading circuit that draws a duty-cycled current load through the power delivery network, allowing for the detection of resonant frequencies by observing variations in measurable properties such as supply voltage and current, without the need for dedicated pins or off-chip equipment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If AC supply impedance is measured using a time-domain approach with dedicated voltage sense pins and off-chip measurement circuits, then measurement capability is achieved, but manufacturing cost and device complexity increase significantly
Solution Approach 1:
The power delivery network itself is used as the measurement tool. The loading circuit draws current through the PDN, and the resulting supply voltage variations are measured by existing voltage sensing circuitry within the PDN, eliminating the need for external measurement equipment. The system measures its own impedance characteristics through self-induced voltage drops.
Solution Approach 2:
Existing voltage sensing circuitry in the power delivery network, originally designed for voltage regulation and monitoring, is repurposed to perform impedance peak detection. The same voltage sense nodes used for power management are utilized to detect supply voltage variations caused by resonant frequency excitation, making the measurement function universal rather than dedicated.
2Ease of manufacture
If resonant frequencies are determined through design-time calculations, then design process is simplified, but manufacturing variability causes frequency discrepancies leading to performance issues
Solution Approach 1:
The loading circuit is pre-configured to draw current at multiple predetermined test frequencies that span the expected resonant frequency range. By systematically exciting the PDN at these pre-selected frequencies before final system operation, the measurement process is prepared in advance, allowing detection of actual resonant frequencies that may differ from design calculations.
Solution Approach 2:
The measurement process provides feedback about actual resonant frequencies to the system configuration. By detecting supply voltage variations at each test frequency and identifying peaks, the system learns the actual resonant characteristics of the manufactured PDN, which can then be used to adjust operating parameters or configure power management to avoid problematic frequencies.
3Reliability
If resonant frequency detection is implemented, then impedance peaks are identified, but additional circuitry and measurement capability are required
Solution Approach 1:
The power delivery network's existing voltage sensing and regulation circuitry is utilized to perform impedance peak detection. The loading circuit, which may be an existing functional block or a simple test current source, generates the excitation signal, and the resulting voltage variations are captured by the PDN's own monitoring infrastructure, eliminating the need for separate detection hardware.
Solution Approach 2:
The resonant frequency detection function is merged with the existing power delivery network operations. The voltage sensing nodes used for power management are combined with impedance measurement functions, and the loading circuit may be integrated with existing functional blocks that can operate in test mode, consolidating multiple functions into shared hardware resources.
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 efficient and cost-effective detection of resonant frequencies, reducing the risk of performance issues and faults by identifying impedance peaks within the power delivery network, thereby improving the reliability of data processing systems.
Implementation Method 1
one or more resonant frequencies can occur within the power delivery network that can give rise to corresponding impedance peaks
Implementation Method 2
When such an impedance peak occurs, this can give rise to a corresponding drop in the supply voltage provided to the components
Data Source
AI summary
An apparatus and method are provided for detecting a resonant frequency giving rise to an impedance peak in a power delivery network used to provide a supply voltage. The apparatus includes resonant frequency detection circuitry that comprises test frequency control circuitry and a loading circuit. The test frequency control circuitry is arranged to generate control signals to indicate a sequence of test frequencies. A loading circuit is controlled by the control signals and operates from the supply voltage. In particular, in response to each test frequency indicated by the control signals, the loading circuit draws a duty-cycled current load through the power delivery network at that test frequency. Operation of the loading circuit produces a measurable property whose value varies in dependence on the supply voltage, thus enabling the resonant frequency to be determined from a variation in the value of that measurable property.