Floorplan Independent Distributed Power Switch With Diode Cross-Current Blocking
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Solution Overview
Problem
Conventional adaptive power multiplexers (APMs) in system-on-a-chip (SOC) designs face challenges with cross-current issues due to signal routing delays, leading to supply noise and failure in power delivery network requirements, and require careful placement and stringent timing control, which burdens design and silicon area usage.
Innovation Solution
Incorporating a local compact low-power comparator and diodes within each APM to compare output voltage with input voltages and activate diodes to block cross-current, allowing for independent placement and minimizing cross-current without relying on precise layout or timing control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If APMs are physically distributed across the SOC to manage voltage supplies, then power management capability is improved, but cross-current issues arise due to signal routing delays
Solution Approach 1:
A diode is introduced as an intermediary component in series with each APM to block cross-current flow. The diode acts as a one-way valve that allows normal power management operations while preventing harmful reverse current caused by signal routing delays between distributed APMs
Solution Approach 2:
The invention changes the electrical parameter characteristics of the APM circuit by adding a diode, which fundamentally alters the current flow characteristics. This parameter change enables the system to maintain distributed APM architecture for flexible power management while eliminating cross-current through the diode's directional conduction property
2Object-generated harmful factors
If careful placement of APMs is implemented to minimize cross-current, then cross-current is reduced, but layout complexity and silicon area increase
Solution Approach 1:
The invention extracts the cross-current prevention function from the APM placement strategy and implements it through a dedicated diode component. This separates the power management function from the layout constraints, allowing APMs to be placed freely without worrying about cross-current issues
Solution Approach 2:
The diode serves as a mediator that decouples the relationship between APM placement and cross-current generation. By placing a diode in series with each APM, the system eliminates the need for careful APM placement while still preventing cross-current
3Object-generated harmful factors
If stringent requirements on signal timing control and APM switching sequence are imposed, then cross-current is minimized, but design burden increases
Solution Approach 1:
The diode provides self-service cross-current protection that automatically activates based on voltage potential differences. This eliminates the need for external timing control or switching sequence management, as the diode inherently prevents cross-current regardless of the switching state of other APMs
Solution Approach 2:
The diode acts as an automatic mediator that protects against cross-current without requiring coordinated control. Its passive operation based on voltage polarity eliminates the need for complex timing control circuits and switching sequence management
4Reliability
If local variations and noise in supply voltages occur, then voltage potential differences arise across the SOC, but this causes reverse current in some APMs
Solution Approach 1:
The diode serves as a protective intermediary that blocks reverse current caused by local voltage variations and noise. When voltage potential differences arise across the SOC, the diode's directional conduction property prevents current from flowing backward through APMs that should be off
Solution Approach 2:
The invention converts the harmful effect of voltage variations and noise into a beneficial protective mechanism. The diode uses the voltage potential difference itself as the trigger for its protective action, automatically blocking reverse current when voltage discrepancies occur without requiring external detection or control
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
The solution effectively prevents or minimizes cross-current, making APMs floorplan independent, reducing supply noise, and enhancing power delivery network reliability while allowing for flexible switching sequences and timing, thus optimizing silicon area usage.
Implementation Method 1
a diode coupled to the switch and the voltage output terminal, the diode being configured to block cross-current flowing to the voltage supply rail
Data Source
AI summary
A floorplan independent and cross-current free distributed adaptive power multiplexer (APM) is disclosed. In some implementations, an APM includes a first switch path coupled between a first voltage supply rail and an output terminal, the first switch path including a first switch; a second switch path coupled between a second voltage supply rail and the output terminal, the second switch path including a second switch, wherein the first switch and the second switch are configured to select one of a first voltage supply and a second voltage supply as an output voltage supply to be output at the voltage output terminal; and a comparator coupled to the first and the second voltage supply rails, and the voltage output terminal, wherein the comparator is configured to compare the output voltage supply with one of the first and the second voltage supplies and to output a control signal.