Multi-VDD Generator Trimming with Dual Reference Voltage Control
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Solution Overview
Problem
In semiconductor devices, simultaneous trimming of multiple power source voltage generators can lead to inappropriate adjustments, affecting the performance and efficiency of the NAND chip.
Innovation Solution
A semiconductor device with a reference voltage supply circuit and power source voltage supply circuit that includes multiple VDD generators, where a first reference voltage is used for IO pads and a second reference voltage for other components, allowing for controlled trimming of all generators simultaneously and then focusing on the IO pad generator for precise adjustment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple power source voltage generators are simultaneously trimmed, then trimming efficiency is improved, but trimming precision deteriorates leading to inappropriate adjustments
Solution Approach 1:
The patent divides the trimming process into two distinct phases: a first trimming process that simultaneously trims all power source voltage generators to establish a baseline, and a second trimming process that focuses specifically on the IO pad power source voltage generator for precise adjustment. This segmentation allows the system to achieve both high productivity in the first phase and high precision in the second phase, resolving the contradiction between trimming efficiency and trimming precision.
Solution Approach 2:
The first trimming process serves as a preliminary action that pre-adjusts all power source voltage generators to appropriate voltage levels before the second trimming process. This preliminary adjustment ensures that when the second trimming process focuses on the IO pad generator, the other generators are already in a suitable state, preventing inappropriate adjustments while maintaining high precision for the critical IO pad generator.
2Device complexity
If a single reference voltage is used for all power source voltage generators, then device complexity is reduced, but performance optimization deteriorates
Solution Approach 1:
The patent applies different reference voltages to different power source voltage generators based on their specific requirements: a first reference voltage is supplied to the IO pad power source voltage generator during the second trimming process for precise control, while a second reference voltage is supplied to other power source voltage generators. This local differentiation optimizes performance for each generator type without excessively increasing device complexity, as the reference voltage supply circuit is designed to efficiently manage multiple reference voltages.
Data Source
AI summary
In one embodiment, a semiconductor device includes a reference voltage supply circuit configured to supply a first reference voltage and a second reference voltage. The device further includes a power source voltage supply circuit including a first power source voltage generator supplied with the first reference voltage and configured to generate a first power source voltage, and a second power source voltage generator supplied with the second reference voltage and configured to generate a second power source voltage, the power source voltage supply circuit being configured to supply the first power source voltage and the second power source voltage to a power source voltage line. The device further includes a voltage control circuit connected to the power source voltage line, and configured to control a value of the first reference voltage and a value the second reference voltage.