Voltage Switching Circuit for Semiconductor Apparatus
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Modern semiconductor apparatuses require high voltages for operations like programming and erasing flash memories, but existing voltage switching technologies face challenges in efficiently and reliably managing voltage switching across a wide voltage range, especially when converting low voltage control signals into high voltage control signals.
Innovation Solution
A high voltage switching circuit comprising a control signal generation block and a high voltage transfer block, utilizing depletion type high voltage switches to generate complementary high voltage control signals and switching signals, ensuring stable operation by raising the voltage level to match the high voltage, thereby enabling reliable high voltage transfer in semiconductor memory apparatuses.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional voltage switching technologies are used to convert low voltage control signals into high voltage control signals, then the semiconductor apparatus can operate under a wide voltage range, but the voltage switching efficiency and reliability deteriorate
Solution Approach 1:
The patent introduces an intermediate voltage level (e.g., 5V) between the low voltage control signal (e.g., 3.3V) and the high voltage (e.g., 12V or higher). The first switch circuit converts the low voltage control signal to the intermediate voltage, and the second switch circuit converts the intermediate voltage to the high voltage. This two-stage conversion process improves reliability by avoiding direct conversion challenges and ensuring stable voltage switching across wide voltage ranges.
2Device complexity
If direct voltage conversion from low voltage to high voltage is implemented, then the circuit complexity is reduced, but the voltage switching stability and control precision deteriorate
Solution Approach 1:
The voltage conversion process is segmented into two distinct stages: first, converting the low voltage control signal to an intermediate voltage level using a first switch circuit; second, converting the intermediate voltage to the final high voltage level using a second switch circuit. This segmentation allows each stage to be optimized independently, ensuring precise voltage level control and stable switching without requiring a single complex direct conversion circuit.
3Adaptability or versatility
If high voltage switches are used to control high voltage operations, then the programming and erasing functions are enabled, but the switch circuit reliability under wide voltage ranges deteriorates
Solution Approach 1:
The patent uses an intermediate voltage level as a mediator between the low voltage control logic and the high voltage switch circuit. The first switch circuit generates an intermediate voltage control signal from the low voltage control signal, which then drives the second switch circuit to control the high voltage switches. This intermediate stage protects the control logic from high voltage while ensuring reliable switching, enabling programming and erasing functions without compromising switch circuit reliability.
Data Source
AI summary
A voltage switching circuit includes: a control signal generation block configured to include a high voltage switching block which controls an electric current flowing according to a high voltage in response to a voltage level of a low voltage control signal and generates complementary high voltage control signals; and a high voltage transfer block configured to be driven according to the complementary high voltage control signals, and generate a switching signal, the voltage level of which is raised based on the high voltage so that the switching signal has substantially the same level as the high voltage.