Digital Startup Timer Circuit for IC Stability
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Solution Overview
Problem
Conventional startup circuits for integrated circuit devices introduce stability issues due to the addition of an analog closed loop, particularly when high gain elements are used, making it challenging to maintain circuit stability during startup.
Innovation Solution
A digital time-based control circuit that uses a startup timer to generate a startup timing signal and a switching element to apply a startup control signal to the load during a startup period, eliminating the need for an additional loop and maintaining stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If an analog closed loop circuit is used to control the startup circuit, then the startup control can be achieved, but the circuit stability deteriorates due to the additional loop and high gain elements
Solution Approach 1:
The patent replaces the analog closed-loop control system with a digital time-based control system. The digital controller generates a startup timing signal based on time intervals rather than using analog feedback loops, thereby eliminating the stability issues caused by additional analog loops and high-gain elements while maintaining effective startup control
Solution Approach 2:
The patent introduces a digital timer as an intermediary component that mediates between the power-up event and the startup circuit activation. The timer generates controlled timing signals that enable the startup circuit for a specific duration without requiring direct analog feedback, thus avoiding the stability problems of conventional analog closed-loop control
2Ease of operation
If the startup circuit is switched in and out using an analog closed loop, then normal operation can be achieved, but the device complexity increases due to the additional startup loop
Solution Approach 1:
The patent substitutes the complex analog closed-loop startup control mechanism with a simpler digital time-based control system. The digital controller uses predetermined time intervals to manage startup circuit activation, eliminating the need for additional analog loops and reducing overall circuit complexity while maintaining operational effectiveness
Data Source
AI summary
A control circuit used in an integrated circuit device is described. The control circuit comprises a startup timer configured to generate a startup timing signal; a startup circuit configured to generate a startup control signal; and a switching element coupled between the startup circuit and a load; wherein the switching element applies the startup control signal to the load during a startup period associated with the startup timing signal. A method of controlling an operation of an integrated circuit device is also described.