Active Driver Standby-to-Active Voltage Drop Prevention
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Solution Overview
Problem
Semiconductor devices experience an unwanted voltage drop when transitioning from standby mode to active mode due to structural and operational characteristics of the active driver, leading to operational concerns.
Innovation Solution
An active driver is designed with a mirror circuit, first and second reset circuits, and an output circuit to generate and manage drive and sink voltages, ensuring a quick transition from standby to active mode by outputting external voltage as internal voltage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the active driver operates with conventional structure when changing from standby mode to active mode, then the device can transition between modes, but the output voltage level temporarily drops before rebounding to normal level
Solution Approach 1:
The patent applies preliminary action by pre-charging a capacitor during standby mode through the first reset circuit, so that when transitioning to active mode, the capacitor immediately provides the necessary charge to maintain voltage levels, preventing the temporary voltage drop that would otherwise occur during mode transition
Solution Approach 2:
The patent introduces an intermediary capacitor that acts as a buffer between the power supply and the active driver output. This capacitor temporarily stores and releases charge during mode transitions, mediating the voltage fluctuations and ensuring stable output voltage levels during the transition from standby to active mode
Data Source
AI summary
An active driver includes a mirror circuit suitable for generating a drive voltage and a sink voltage using an external voltage, a first reset circuit suitable for outputting the drive voltage of a logic high level in a standby mode; a second reset circuit suitable for transitioning the drive voltage to a logic low level in response to the sink voltage when being changed from the standby mode to an active mode, and an output circuit suitable for outputting the external voltage as an internal voltage in response to the drive voltage when being changed from the standby mode to the active mode.