Differential Amplifier Shield Electrode Layout for EMI Immunity
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Solution Overview
Problem
Semiconductor devices that input differential signals require improved electromagnetic interference (EMI) immunity to prevent noise and malfunction caused by external electromagnetic waves.
Innovation Solution
A semiconductor device with a shield electrode on its main surface, fixed to ground potential, concealing the device region, and a semiconductor chip with a demarcated constant current and input regions, enhancing EMI immunity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If a differential amplifier circuit is used to amplify differential signals, then signal amplification capability is improved, but electromagnetic interference immunity deteriorates due to susceptibility to external electromagnetic waves
Solution Approach 1:
A shield electrode is introduced as an intermediary element between the differential amplifier circuit and external electromagnetic waves. The shield electrode, connected to ground potential, acts as a mediator that intercepts and redirects electromagnetic interference away from the sensitive amplifier circuit, thereby protecting it without affecting the signal amplification function
Solution Approach 2:
The shield electrode converts the harmful effect of electromagnetic waves into a beneficial grounding effect. By providing a low-impedance path to ground, the shield electrode directs electromagnetic interference away from the amplifier circuit and dissipates it safely through the ground connection, transforming a potential harm into a protective mechanism
2Object-affected harmful factors
If the semiconductor chip area is increased to accommodate additional EMI protection structures, then electromagnetic interference immunity is improved, but chip area increases
Solution Approach 1:
The shield electrode is positioned in a vertical dimension above or below the differential amplifier circuit on the chip surface, rather than expanding the horizontal footprint. This three-dimensional arrangement provides EMI protection while maintaining a compact chip area, as the shield operates in the vertical space above/below the circuit rather than requiring additional lateral space
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
The shield electrode and ground potential configuration significantly enhance the device's resistance to electromagnetic interference, improving signal integrity and reducing noise-related malfunctions.
Implementation Method 1
a shield electrode that is arranged on the main surface such as to conceal the device region in a plan view and that is fixed to a ground potential
Data Source
AI summary
A semiconductor device includes a semiconductor chip that has a main surface, a device region that is demarcated at the main surface, a differential amplifier that is formed in the device region and that amplifies and outputs a differential signal input to the differential amplifier, an insulation layer that covers the device region on the main surface, and a shield electrode that is incorporated in the insulation layer such as to conceal the device region in a plan view and that is fixed to a ground potential.