Voltage Generation Circuit with Delayed Pull-Down Stabilization
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Solution Overview
Problem
Integrated circuits face instability and abnormal operation due to excessive internal voltage levels immediately after initialization, leading to improper functioning or complete failure.
Innovation Solution
A voltage generation circuit that includes a voltage generator initialized by a first power on reset signal and a pull-down driving unit activated by a second delayed power on reset signal, utilizing PMOS transistors and NMOS transistors in series with resistors to stabilize the output node voltage, preventing excessive increases and ensuring stable operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If voltage generation circuits generate internal voltages immediately after initialization, then the circuits can start operation quickly, but the internal voltages may be largely out of target values causing abnormal operation or complete failure
Solution Approach 1:
The patent applies preliminary action by initializing the voltage generator before enabling it to generate voltages. The initialization unit sets all internal nodes to predetermined levels (ground potential) before the voltage generation starts, ensuring that when the generator begins operation, the internal voltages are already at safe target values, preventing abnormal operation while maintaining quick startup
2Device complexity
If a single power on reset signal is used for initialization, then the circuit structure is simple, but the output nodes may experience excessive voltage increases during initialization causing abnormal operation
Solution Approach 1:
The patent segments the single power-on reset signal into two distinct signals: POR1 (first power on reset signal) for initializing the voltage generator and POR2 (second power on reset signal) for controlling the pull-down driving units. This segmentation allows independent control of initialization and voltage stabilization, preventing excessive voltage increases at output nodes while maintaining reasonable circuit complexity
Solution Approach 2:
The patent uses preliminary action by enabling POR1 before POR2 in a delayed manner. The initialization unit responds to POR1 first to set internal nodes to safe levels, and only after this initialization is complete (when POR2 is enabled with a delay) do the pull-down driving units activate to prevent excessive voltage increases. This sequential activation ensures voltage stability without requiring complex simultaneous control
Data Source
AI summary
A voltage generation circuit includes a voltage generator initialized in response to a first power on reset signal, and generates an internal voltage on an output node using an external voltage; and a pull-down driving unit which pull-down drives the output node in response to a second power on reset signal delayed from the first power on reset signal.