Self-Reference Impedance Circuit for Stable On-Chip Reference Power
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Solution Overview
Problem
Existing integrated circuits require external resistors to generate reference power, which are susceptible to noise disturbances and occupy space, increasing manufacturing costs.
Innovation Solution
An integrated circuit with self-reference impedance that includes an input/output pin, local impedance, reference power circuit, switching circuit, and control circuit, allowing selection between external and local impedance to generate reference signals, reducing noise interference and design area requirements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an external resistor is used to generate reference power, then the reference power can be generated, but the external resistor is susceptible to noise disturbance and occupies space
Solution Approach 1:
The patent extracts the impedance function from the external resistor and implements it internally within the integrated circuit. The reference power circuit includes an impedance element that provides the necessary impedance without requiring an external resistor, thereby eliminating the noise susceptibility and space occupation of external components while maintaining reference power generation capability
Solution Approach 2:
The integrated circuit is designed to generate reference power using its own internal impedance elements rather than relying on external components. The reference power circuit uses internally integrated impedance that is less susceptible to noise and does not occupy external space, allowing the circuit to serve itself for reference power generation
2Reliability
If an external resistor is used to generate reference power, then the reference power can be generated, but the product manufacturing cost increases
Solution Approach 1:
The patent merges the impedance function with the reference power generation circuit by integrating the impedance element directly into the reference power circuit. This consolidation eliminates the need for separate external resistors and reduces the number of components, thereby lowering manufacturing costs while maintaining reference power generation functionality
Solution Approach 2:
The reference power circuit is designed with multi-functionality, where the same circuit block performs both reference power generation and provides the necessary impedance without requiring external components. This universal design reduces component count and manufacturing complexity, lowering production costs
3Object-affected harmful factors
If local impedance is used to generate reference signal, then noise disturbance is reduced, but the circuit design area increases
Solution Approach 1:
The patent applies local quality by implementing the impedance element locally within the reference power circuit rather than using external components. This localized integration reduces noise susceptibility while the efficient layout and integration techniques minimize the area occupied by the circuit, balancing noise reduction with space efficiency
Data Source
AI summary
An integrated circuit with self-reference impedance includes an input/output pin provided for connection to an external impedance, a local impedance, a reference power circuit, a switching circuit, and a control circuit. The switching circuit is configured to conduct a connection between the input/output pin and the reference power circuit in a first state and to conduct a connection between the local impedance and the reference power circuit in a second state. The control circuit is configured to detect whether the external impedance is connected to the input/output pin or not and to generate a detection signal. The control circuit controls the switching circuit into the first state or the second state according to the detection signal. In the first state, the reference power circuit generates a reference signal according to the external impedance. In the second state, the reference power circuit generates the reference signal according to the local impedance.