Clock Interface Circuit With Auto-Switching Clock Source Control
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Solution Overview
Problem
Existing electronic systems lack flexibility in controlling clock signals, requiring multiple custom semiconductor dies for different applications and often relying on external clock sources, which increases manufacturing costs and complexity.
Innovation Solution
A semiconductor die with a clock interface circuit that includes an oscillator and comparator, allowing it to operate in multiple clock control modes based on electrical characteristics, either using an input clock signal or an internally generated oscillator signal, thereby providing flexibility in clock signal generation and reducing the need for external clock sources.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple custom semiconductor dies are used for different applications, then clock signal control flexibility is improved, but manufacturing complexity and costs increase
Solution Approach 1:
The clock interface circuit is designed to support multiple clock control modes within a single semiconductor die. The circuit includes an oscillator that can generate clock signals, and a comparator that detects electrical characteristics to automatically select between different clock sources (external or internal). This multi-functional design allows the same die to serve various applications without requiring custom-designed semiconductor dies for each application, thereby reducing manufacturing complexity while maintaining flexibility.
Solution Approach 2:
The clock interface circuit dynamically adapts its operation based on detected electrical characteristics. The comparator continuously monitors the clock interface pin and automatically switches between clock control modes (external clock input or internal oscillator) depending on the detected conditions. This dynamic behavior enables a single die to flexibly respond to different application requirements without manual configuration or multiple custom designs.
2Measurement precision
If external clock sources are used, then clock signal control precision is improved, but device complexity and cost increase
Solution Approach 1:
The clock interface circuit acts as an intermediary between external clock sources and the core circuit. It includes a comparator that detects electrical characteristics at the clock interface pin and automatically determines whether to use an external clock signal or generate an internal oscillator signal. This intermediary function allows the system to achieve precise clock control when external sources are available while automatically falling back to internal generation when external sources are not present, reducing device complexity without sacrificing precision when needed.
Solution Approach 2:
The clock interface circuit is self-configuring and automatically selects the appropriate clock source based on detected electrical characteristics. The comparator monitors the clock interface pin and autonomously decides whether to use an external clock or the internal oscillator, eliminating the need for manual configuration or additional control logic. This self-service capability reduces device complexity while maintaining precise clock control when external sources are available.
Data Source
AI summary
Apparatus and methods for controlling a clock signal are provided. In certain embodiments, a semiconductor die includes a core circuit and a clock interface circuit that provides a clock signal to the core circuit. The clock interface circuit includes an oscillator for generating an oscillator signal, and a comparator for controlling operation of the clock interface circuit in a selected clock control mode based on comparing an electrical characteristic of the clock interface pin to a comparison threshold. The selected clock control mode is chosen from a first clock control mode in which the clock interface circuit generates the clock signal based on an input clock signal received on a clock interface pin, or a second clock control mode in which the clock interface circuit generates the clock signal based on the oscillator signal.