Anti-Parallel Diode Device With Voltage Balancing Resistors
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Solution Overview
Problem
Existing anti-parallel diode devices face issues with unbalanced voltages across diodes during electrostatic discharge (ESD) events, leading to potential diode breakdown and damage, especially when diodes are in reverse-bias states.
Innovation Solution
The anti-parallel diode device design includes semiconductor diodes of different conductivity types, where one side of the diodes is forwardly turned on, and the other side has clearly defined reverse voltages, with a layout that minimizes area consumption in integrated circuits (ICs) and allows for voltage dividing potentials between diode strings to balance voltages, preventing excessive reverse-bias voltages.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If diodes are used in anti-parallel configuration for ESD protection, then ESD protection function is achieved, but unbalanced cross-voltages cause breakdown and damage to diodes
Solution Approach 1:
A voltage balancing circuit is introduced as an intermediary component between the anti-parallel diodes and the reference voltage. This circuit includes resistors connected in series with each diode string, which act as mediators to distribute and balance the cross-voltages across the diodes during reverse-bias states, preventing any single diode from experiencing excessive voltage that could cause breakdown.
Solution Approach 2:
The invention changes the electrical parameters of the diode strings by introducing series resistors that modify the voltage distribution characteristics. These resistors alter the impedance balance between the two anti-parallel diode strings, ensuring that during ESD events, the voltages across both diode strings remain balanced and within safe operating limits.
2Reliability
If voltage clamping is performed to protect IC, then ESD protection is provided, but layout area consumption increases
Solution Approach 1:
The voltage balancing circuit is merged with the existing anti-parallel diode structure by integrating resistors directly into the diode string connections. This combination allows the balancing function to be achieved without adding separate discrete components, thereby minimizing the additional layout area required while maintaining effective voltage clamping protection.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This design effectively minimizes the effect of unbalancing voltages across diodes, reducing the risk of damage and allowing for a wider range of normal operating signals and higher clamping voltages without affecting IC operations.
Implementation Method 1
The second semiconductor is in contact with the first semiconductor, so that the first semiconductor and the second semiconductor form a first diode
Implementation Method 2
The third semiconductor is in contact with the first semiconductor, so that the first semiconductor and the third semiconductor form a second diode
Implementation Method 3
A first terminal of the third diode is electrically connected to the first semiconductor. The first terminal of the third diode is of the second conductivity type
Data Source
AI summary
An anti-parallel diode device includes a first semiconductor, a second semiconductor, a third semiconductor, and a third diode. The first semiconductor is of a first conductivity type, and the second semiconductor and the third semiconductor are of a second conductivity type. The second semiconductor is in contact with the first semiconductor, so that the first semiconductor and the second semiconductor form a first diode. The third semiconductor is in contact with the first semiconductor, so that the first semiconductor and the third semiconductor form a second diode. A first terminal of the third diode is electrically connected to the first semiconductor. The first terminal of the third diode is of the second conductivity type.