Integrated Passive Device ESD Protection Circuit Topology
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Solution Overview
Problem
Existing integrated passive devices with electrostatic discharge protection mechanisms suffer from parasitic capacitors formed by series-connected diodes, which affect frequency responses and fail to meet design requirements, especially at higher frequencies.
Innovation Solution
The electrostatic discharge protection element is connected in parallel to the capacitor of the filtering circuit, allowing diodes to form a parasitic capacitor that is adjusted by altering the capacitance of the third capacitor, thereby reducing the impact on frequency response.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If electrostatic discharge protection element is connected in series to antenna terminal, then static electricity is conducted to ground, but parasitic capacitor affects frequency response of filtering circuit
Solution Approach 1:
The patent introduces a third capacitor as an intermediary element connected between the second capacitor and ground. This intermediary capacitor provides a dedicated path for electrostatic discharge while isolating the parasitic capacitance of the protection diodes from the main filtering circuit, thereby protecting against static electricity without degrading the frequency response of the filtering circuit.
Solution Approach 2:
The patent segments the electrostatic discharge protection function from the main filtering circuit by creating a separate discharge path through the third capacitor. This segmentation allows the protection element to operate independently without interfering with the frequency response characteristics of the primary filtering components.
2Reliability
If series-connected diodes are used for electrostatic discharge protection, then static electricity conduction is achieved, but frequency response at higher frequencies fails to meet design requirements
Solution Approach 1:
The third capacitor acts as a mediator that handles high-frequency electrostatic discharge events separately from the main signal path. By providing this intermediate discharge path, the patent enables effective protection at higher frequencies without allowing the parasitic capacitance of the diodes to degrade the frequency response of the filtering circuit.
Solution Approach 2:
The patent changes the electrical parameters of the discharge path by introducing the third capacitor with specific capacitance value. This parameter change creates a discharge path that is effective for electrostatic protection while having minimal impact on the frequency response characteristics, particularly at higher frequencies where the original series connection failed.
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 configuration ensures that the frequency response of the integrated passive device meets design requirements, with minimal influence from the parasitic capacitor, maintaining performance even at higher frequencies.
Implementation Method 1
an electrostatic discharge protection element for conducting static electricity to ground
Implementation Method 2
The electrostatic discharge protection element comprises a plurality of diodes electrically connected to each other in series for conducting the static electricity to ground
Implementation Method 3
The first filtering circuit comprises capacitor and inductor elements for filtering the wireless signal
Implementation Method 4
The first filtering circuit comprises capacitor and inductor elements for filtering the wireless signal
Implementation Method 5
the diodes electrically connected to each other in series form a parasitic capacitor, and further affect frequency responses of the filtering circuits
Data Source
AI summary
An integrated passive device with electrostatic discharge protection mechanism includes an antenna terminal for receiving and transmitting a wireless signals, a first frequency terminal for receiving and transmitting a signal with a first frequency, a first filtering circuit for filtering the wireless signal, and an electrostatic discharge protection element for conducting static electricity to ground. The first filtering circuit includes a first filtering element with a first end electrically connected to the antenna terminal, a second filtering element with a first end electrically connected to a second end of the first filtering element and a second end electrically connected to the first frequency terminal, and a third filtering element with a first end electrically connected to the second end of the first filtering element and a second end electrically connected to ground. The electrostatic discharge protection element is coupled between the second end of the first filtering element and ground.