Power-Up Signal Sequencing for Stable Internal Voltage Control
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Solution Overview
Problem
Semiconductor devices face instability in internal circuit operations due to internal voltage generation before it reaches a stable state, affecting the reliability of operations like e-fuse array read operations.
Innovation Solution
A semiconductor device with a voltage detection circuit that sequentially activates pre-power-up, power-up, and post-power-up signals to control internal voltage generation and circuit operations, ensuring stabilization of the internal voltage before enabling the internal circuit.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the internal circuit is enabled in response to the power-up signal, then the internal circuit can operate using the internal voltage, but the operation stability of the internal circuit cannot be ensured because the internal voltage is generated in an unstable state
Solution Approach 1:
The patent applies preliminary action by generating the internal voltage before enabling the internal circuit to operate. The power-up signal is generated first to activate the internal voltage generation circuit, and only after the internal voltage is established does the circuit enable signal get activated to allow the internal circuit to operate. This sequencing ensures that the internal voltage is ready and stable before the circuit that depends on it begins operation.
2Ease of operation
If the internal voltage is generated in response to the power-up signal, then the internal voltage can be provided to the internal circuit, but the internal voltage may be generated in an unstable state causing improper operation
Solution Approach 1:
The patent applies preliminary action by establishing the internal voltage generation before enabling circuit operation. The power-up signal activates the internal voltage generator first, allowing the voltage to stabilize, and only then is the circuit enable signal activated. This preliminary sequencing ensures voltage stability while maintaining a relatively simple power-up sequence.
Data Source
AI summary
A semiconductor device includes a voltage detection circuit suitable for detecting an external power supply voltage and for sequentially activating first and second power-up signals in a power-up period of the external power supply voltage, and a control circuit suitable for activating at least one first control signal for controlling an internal voltage to be generated based on the first power-up signal, and for activating at least one second control signal for controlling an operation of an internal circuit using the internal voltage when a predetermined time lapses after the first control signal is activated, based on the second power-up signal.