Dynamic Tracking Bias Circuit for Simplified I/O Voltage Supply
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Solution Overview
Problem
Existing interface devices require multiple external voltages, increasing circuit complexity and manufacturing costs due to the need for additional components like ESD clamp circuits.
Innovation Solution
The interface device incorporates a dynamic tracking bias circuit that generates a first supply voltage from the main and second supply voltages, eliminating the need for an ESD clamp circuit on the first supply voltage and simplifying the circuit design by using a level shifter and output driver to provide the necessary voltage, while the second supply voltage is limited by an ESD clamp circuit.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple external voltages are supplied to the interface device, then the device can perform its input/output functions, but the circuit complexity and manufacturing cost increase
Solution Approach 1:
The patent extracts the voltage generation function from external sources and implements it within the interface device itself. The dynamic tracking bias circuit generates the first supply voltage internally by tracking the second supply voltage, eliminating the need for external generation of this voltage and reducing circuit complexity while maintaining voltage supply capability
Solution Approach 2:
The dynamic tracking bias circuit serves multiple functions: it generates the first supply voltage, tracks voltage changes of the second supply voltage, and provides this voltage to multiple circuits including the ESD clamp circuit, pre-driver, and post-driver. This multi-functionality reduces the need for separate voltage generation circuits, thereby reducing overall circuit complexity
2Adaptability or versatility
If multiple external voltages are supplied to the interface device, then the device can perform its input/output functions, but the manufacturing cost increases
Solution Approach 1:
The patent extracts the voltage generation function from external sources and implements it within the interface device itself. The dynamic tracking bias circuit generates the first supply voltage internally by tracking the second supply voltage, eliminating the need for external generation of this voltage and reducing circuit complexity while maintaining voltage supply capability
Solution Approach 2:
The patent merges the voltage generation and regulation functions into a single dynamic tracking bias circuit. This circuit generates the first supply voltage and automatically tracks changes in the second supply voltage, eliminating the need for separate external voltage sources and reducing manufacturing complexity and cost
3Reliability
If an ESD clamp circuit is added to limit the second supply voltage, then the reliability of the interface device improves, but the circuit complexity increases
Solution Approach 1:
The patent merges the ESD protection function with the existing second supply voltage input. The ESD clamp circuit is integrated to limit the second supply voltage to a predetermined level, providing protection without requiring separate external protection circuits. This integrated approach maintains reliability while minimizing additional circuit complexity
Solution Approach 2:
The ESD clamp circuit automatically limits the second supply voltage to a predetermined level without requiring external control or intervention. This self-regulating protection mechanism ensures reliability while maintaining simple circuit operation
Data Source
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AI summary
An interface device includes a dynamic tracking bias circuit, an ESD (Electrostatic Discharge) clamp circuit, a pre-driver, a post-driver, and an I/O (Input/Output) pad. The dynamic tracking bias circuit provides a first supply voltage. The first supply voltage is determined according to a main power voltage and a second supply voltage. The ESD clamp circuit limits the second supply voltage. The post-driver is driven by the pre-driver. The I/O pad is driven by the post-driver. The pre-driver and the post-driver are supplied by the main power voltage, the first supply voltage, and the second supply voltage.