Capacitance Evaluation Circuit for Leakage Current Detection
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Solution Overview
Problem
In semiconductor integrated circuits, capacitances used in voltage generators can become inoperable due to excessive leakage currents, leading to reliability issues and performance degradation, requiring costly replacements of entire devices.
Innovation Solution
A capacitance evaluation circuit that selectively enables or disables individual capacitances based on leakage current testing, using a switch block controlled by a controller to determine and store the status of inoperable capacitances, preventing excessive power consumption and ensuring only operable capacitances are used for voltage generation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If capacitances are used in voltage generators to generate pumped voltages, then voltage generation capability is improved, but reliability deteriorates when capacitance oxide breaks down and excessive leakage current occurs
Solution Approach 1:
The patent applies preliminary action by testing capacitances for leakage current before they are used in voltage generation operations. The capacitance evaluation circuit selectively couples capacitances to a leakage detection circuit, applies a test voltage, and determines leakage current status in advance. This prevents inoperable capacitances from being used, thereby maintaining reliability while enabling voltage generation functionality.
2Reliability
If individual capacitance status is monitored and controlled, then reliability is improved, but device complexity increases due to additional evaluation circuits and control logic
Solution Approach 1:
The patent applies segmentation by dividing the capacitance evaluation function into separate modular components: a switch block for selective coupling, a leakage detection circuit for measurement, and a controller for coordination. Each component performs a specific function, making the overall system more manageable and maintainable while achieving reliable capacitance monitoring and control.
3Loss of energy
If inoperable capacitances are disabled, then power consumption is reduced, but productivity decreases due to potential memory operations failure
Solution Approach 1:
The patent applies feedback by continuously monitoring capacitance leakage current status and using this information to control the switch block. The controller receives leakage current determination results and adjusts the coupling state of capacitances accordingly. This feedback mechanism ensures that only operable capacitances are active during memory operations, preventing power waste while maintaining operational reliability.
Data Source
AI summary
Apparatus and methods for evaluating leakage currents of capacitances are described. Capacitances having excessive leakage currents may be disabled from use. An example apparatus includes a leakage detection circuit configured to be coupled to a capacitance block. The leakage detection circuit is configured to determine whether a leakage current of a capacitance of the capacitance block exceeds a current limit and is further configured to provide an output indicative of a status of the capacitance. A detection controller is coupled to the leakage detection circuit and a register, and the detection controller is configured to store data in the register indicative of the status of the capacitance based at least in part on the signal from the leakage detection circuit.