Level-Shifted High-Voltage Switches for Semiconductor Characterization
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Solution Overview
Problem
The limitation of normal operation voltage ranges in packaged semiconductor devices restricts the application of higher test voltages needed for semiconductor chip characterization, posing a risk of damage and potentially leading to undetected failures until products fail in use.
Innovation Solution
A high voltage switch system comprising a switch and a level shifter, controlled by enable and characterization lines, allows for the safe application of high voltages beyond normal operation ranges by isolating the device controller during testing, enabling effective characterization without damaging the device.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If higher test voltages are applied to packaged semiconductor devices, then semiconductor chip characterization and stress tests can be performed, but the device controller may be damaged
Solution Approach 1:
The patent divides the voltage path into separate segments: a high voltage path for testing the semiconductor chip and a low voltage path for the device controller. This is achieved by introducing high voltage switches that can be independently controlled to connect or disconnect the high voltage path, allowing testing voltages higher than the controller's operating range without damaging the controller.
Solution Approach 2:
The patent introduces high voltage switches as intermediary components between the voltage source and the semiconductor chip. These switches act as mediators that can safely handle high voltages during testing while isolating the device controller from high voltage exposure. The switches are controlled by control signals that enable or disable the high voltage path as needed.
2Reliability
If normal operation voltage ranges are limited in packaged devices, then the device controller is protected, but testing and characterization capabilities are restricted
Solution Approach 1:
The patent makes the voltage path dynamic by introducing controllable high voltage switches that can change the circuit configuration based on testing requirements. During normal operation, the switches remain open, protecting the controller. During testing, the switches close to allow high voltages to reach the semiconductor chip, providing both protection and testing capability.
Solution Approach 2:
The patent creates a universal voltage delivery system that can handle both normal operation voltages and high test voltages through the same physical infrastructure. The high voltage switches enable the system to adapt its function: connecting the voltage source to the controller during normal operation and connecting it to the semiconductor chip during testing, eliminating the need for separate testing equipment.
3Adaptability or versatility
If high voltage switches are introduced to enable high voltage testing, then testing capability is improved, but device complexity increases
Solution Approach 1:
The patent merges the high voltage switching functionality with the existing voltage delivery infrastructure. Rather than adding completely separate testing equipment, the high voltage switches are integrated into the existing voltage path, sharing common elements such as the voltage source and control logic, thereby reducing overall system complexity despite adding switching capability.
Data Source
AI summary
Apparatus and method for coupling high voltages for a semiconductor device via high voltage switches are disclosed. A high voltage switch includes a switch and a level shifter. The switch is defined between a voltage source and a voltage output. An enable line is coupled to a first transistor of the switch. The level shifter includes an input and an output. A characterization line is coupled to the input of the level shifter and the output of the level shifter is coupled to a second transistor of the switch. The level shifter further includes a power rail that is coupled to the switch between the first transistor and the second transistor.