Selective Power Clamp Shut-Off for ESD-Safe DC-DC Output Stages
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Solution Overview
Problem
Integrated circuits and microelectronic devices are increasingly susceptible to damage from electrostatic discharge (ESD) due to their smaller sizes and higher sensitivity, which can lead to malfunction or damage, necessitating effective protection mechanisms.
Innovation Solution
The implementation of a circuit architecture with deterministic pull-up and pull-down circuitry that transitions between operational modes during ESD events to prevent excessive voltage drops and facilitate safe current conduction, using a DC-DC output stage with a power clamp and resistor-capacitor (RC) circuits to manage ESD currents.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If power clamp circuitry is used to protect against ESD, then reliability is improved, but device complexity increases
Solution Approach 1:
The patent extracts the power clamp circuitry from the main signal path by placing it in a separate domain (e.g., power domain or voltage domain). This allows the protection function to be isolated, reducing its impact on the overall circuit complexity while maintaining ESD protection effectiveness. The power clamp is activated only when needed (during ESD events) rather than being permanently in the signal path.
Solution Approach 2:
The patent implements preliminary protection measures by pre-configuring the power clamp circuitry to activate automatically upon detection of ESD conditions. The circuit includes detection mechanisms that trigger the power clamp before the full ESD event can damage sensitive components, providing proactive protection without requiring complex real-time response systems.
2Reliability
If deterministic pull-up and pull-down circuitry is implemented, then voltage drop control is improved, but device complexity increases
Solution Approach 1:
The patent applies deterministic pull-up and pull-down circuitry locally at critical nodes where voltage control is most needed, rather than throughout the entire circuit. This targeted approach ensures proper voltage levels at sensitive points during ESD events while minimizing the overall circuit complexity. The pull-up/pull-down elements are strategically placed based on local voltage control requirements.
Solution Approach 2:
The patent implements dynamic pull-up and pull-down circuitry that adjusts its operation based on the ESD event state. The circuit transitions between different operational modes (normal operation vs. ESD protection mode), activating deterministic voltage control only when ESD conditions are detected. This dynamic behavior provides effective voltage control during critical events while maintaining simpler operation during normal conditions.
Data Source
AI summary
Techniques and mechanisms for selectively disabling functionality of a power clamp circuit which is to mitigate damage due to electrostatic discharge (ESD). In an embodiment, a shut-off circuit is coupled to receive a control signal which indicates an actual or expected future power state transition of a load. The power clamp circuit comprises a pull-up circuit and a pull-down circuit which are coupled in series between a first interconnect and a second interconnect, which are to receive a first supply voltage and a second supply voltage, respectively. Based on a filtered version of the control signal, the shut-off circuit generates a first one or more signals to selectively disable the pull-up circuit. The shut-off circuit further generates a second one or more signals, based on the filtered version of the control signal, to selectively disable the pull-down circuit.