MEMS Switch Block for Combined DC and RF Semiconductor Testing

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Solution Overview

Problem

Conventional semiconductor testing requires cumbersome and time-consuming two-pass methods for DC and RF tests, involving reconfiguration of connections between the device under test and automatic test equipment, which is inefficient due to large footprint relay circuits and noise interference.

Innovation Solution

The implementation of microelectromechanical systems (MEMS) switches that enable switching between DC and RF paths without reconfiguring connections, allowing for simultaneous testing by operating in multiple states within a single MEMS switch block, with integrated bleeding and shunt circuits to isolate paths and reduce interference.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If conventional relay circuits are used for switching between DC and RF paths, then connection reconfiguration is achieved, but the footprint area increases and noise interference occurs

Engineering Contradiction:

Improveconnection reconfiguration capabilityVSAvoidrelay circuit footprint

Core Design Contradiction:

Adaptability or versatilityVSArea of stationary object

Solution Approach 1:

The patent replaces conventional mechanical relay circuits with microelectromechanical systems (MEMS) switches. This substitution eliminates the large footprint associated with traditional relay circuits while maintaining the ability to reconfigure connections between DC and RF paths. The MEMS switches achieve the same switching functionality with significantly reduced area occupation.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The patent introduces MEMS switches as intermediary components between the DC test equipment and RF test equipment, and between the device under test and the testing systems. These MEMS switches serve as mediators that enable connection reconfiguration without requiring large relay circuits, thus resolving the contradiction between adaptability and footprint area.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Adaptability or versatility

If conventional relay circuits are used for switching between DC and RF paths, then connection reconfiguration is achieved, but noise interference increases

Engineering Contradiction:

Improveconnection reconfiguration capabilityVSAvoidnoise interference

Core Design Contradiction:

Adaptability or versatilityVSObject-generated harmful factors

Solution Approach 1:

The patent replaces conventional relay circuits with MEMS switches, which generate significantly less noise interference. The MEMS technology provides cleaner switching transitions and reduces electromagnetic interference, thereby eliminating the noise problems associated with traditional relay-based connection reconfiguration.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

3Reliability

If two-pass testing method is used for DC and RF tests, then comprehensive testing is achieved, but testing time increases

Engineering Contradiction:

Improvetesting comprehensivenessVSAvoidtesting duration

Core Design Contradiction:

ReliabilityVSLoss of time

Solution Approach 1:

The patent implements dynamic switching between DC and RF testing modes using MEMS switches that can rapidly reconfigure connection paths. This dynamic capability allows the system to transition between different test types without requiring separate physical reconfiguration steps, thereby reducing overall testing time while maintaining comprehensive test coverage.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The patent enables continuous testing operations by maintaining persistent connections through the MEMS switch fabric. Instead of interrupting testing for reconfiguration, the MEMS switches allow seamless transition between DC and RF test modes, keeping the useful testing action continuous and eliminating idle reconfiguration time.

Inventive Principle:

Principle #20Continuity of useful action

4Adaptability or versatility

If reconfiguration of connections is performed between DC and RF tests, then testing adaptability is achieved, but device complexity increases

Engineering Contradiction:

Improvetesting mode switching capabilityVSAvoidconnection reconfiguration complexity

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The patent merges the DC testing path and RF testing path into a unified test system architecture using MEMS switches. By combining these previously separate testing pathways into a single integrated system with shared components and centralized control, the patent reduces overall device complexity while maintaining full adaptability for both DC and RF testing modes.

Inventive Principle:

Principle #5Merging (Combining)

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 approach facilitates efficient, high-speed semiconductor testing by eliminating the need for reconfiguration, reducing noise interference, and optimizing layout, enabling both DC and RF tests without the drawbacks of traditional relay systems.

Implementation Method 1

a plurality of microelectromechanical systems (MEMS) switches coupled to the plurality of first terminals and the plurality of second terminals

Methodology Applied

Scientific EffectMicroelectromechanical Systems: Microelectromechanical Systems

Data Source

PatentUS20240402239A1Apparatuses and methods for testing semiconductor circuitry using microelectromechanical systems switches

Publication Date: 2024.12.05 ANALOG DEVICES INT UNLTD CO

AI summary

An apparatus is provided that is implemented to enable multiple tests of different types, such as a direct current (DC) test and/or a radio frequency (RF) test of a semiconductor device. The apparatus includes a microelectromechanical systems (MEMS) switch block coupled between the semiconductor device and automatic testing equipment (ATE). The apparatus is configured to enable/disable a DC path or an RF path to switch between a DC test and an RF test without reconfiguring the connections between the semiconductor device and the ATE. The DC path is used to perform a DC contact test for one or more pins of the semiconductor device. The RF path is used to perform an RF test for the semiconductor device.