Configurable Memory Test Interposers for DDR5 DFE ISI Simulation
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Solution Overview
Problem
Existing test and characterization fixtures for memory devices are unable to adequately simulate inter-symbol interference (ISI) conditions that memory devices encounter in real-world systems, particularly for decision feedback equalization (DFE) circuitry, leading to inadequate testing and characterization of DFE circuitry before integration into memory systems.
Innovation Solution
Interposers with configurable channel circuits that include resistive elements and electrical contacts, allowing for customizable channel conditions to simulate various ISI scenarios, enabling testing and characterization of DFE circuitry at speeds relevant to actual system integration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If existing test fixtures are used, then device compatibility is maintained, but testing accuracy for DFE circuitry deteriorates due to inability to simulate realistic ISI conditions
Solution Approach 1:
The test fixture incorporates configurable channel circuits with resistive elements that can be dynamically adjusted to simulate different ISI conditions. The channel circuits can be reconfigured to match various real-world channel characteristics, enabling the fixture to adapt to different testing scenarios while maintaining measurement precision.
Solution Approach 2:
The invention changes the parameters of the channel circuits by introducing configurable resistive elements that can be adjusted to simulate different ISI scenarios. By modifying the resistance values and channel characteristics, the test fixture can accurately represent various real-world channel conditions, thereby improving testing accuracy for DFE circuitry.
2Reliability
If simple channel circuits are used, then device complexity is reduced, but testing realism deteriorates due to inability to simulate ISI conditions
Solution Approach 1:
The invention introduces channel circuits with resistive elements as intermediary components between the test device and the DFE circuitry under test. These intermediary circuits simulate the effects of real-world channel conditions including ISI, providing realistic testing without requiring complex actual channel environments.
Solution Approach 2:
The channel circuits create simplified copies or models of real-world channel conditions by using resistive elements to simulate ISI effects. Rather than requiring actual complex channel environments, the invention creates representative models that capture the essential characteristics of real channels, achieving testing realism with controlled complexity.
Data Source
AI summary
Interposers for use in testing and characterizing memory devices, such as memory devices including decision feedback equalization circuitry, are disclosed herein. In one embodiment, an apparatus includes an interposer having a first interface couplable to a memory device, a second interface couplable to one or more testers, and a channel circuit between the first interface and the second interface. The channel circuit is configurable, via one or more resistive elements, to change a measurable value of a signal transmitted between the first interface and the second interface via the channel circuit.