Assuring critical component from entire distribution of process variation is covered in EDVT is important. One can order fast and slow parts of any critical component in lieu of frequency margin. Many design uses same frequency tree for various PLL and Ethernet circuit as a result it is becoming harder and harder to do frequency margining. PRBS (Pseudorandom binary sequence) or killer are selected then DVT test cases uncovers many issues related to crosstalk, ground bounce and SI (Signal integrity) issues.Īs product design is getting complex and devices are getting smaller and faster, EDVT margining is becoming challenging. Circuit behaves either fast or slow during corner conditions and that brings out any timing violation such as setup or hold time. Electrical parameters resistance, capacitance, inductance, material behavior, device current and threshold voltage, transistor on and off time changes due to margining these three parameters. Each parameter has a individual stress impact on product but combining them in unique way may bring out product issues faster. Voltage, Frequency and Temperature are three major factors impacts electrical functionality of the products. Smartness is not in consolidating in one test standard which fits all products rather adopting to test strategy for particular product category to avoid over design and testing. Today, portfolio may consist of vast difference in product categories based on deployment, applications and environment. In past, one DVT spec served most of the product’ in company’s portfolio. Picking up just right amount of correct testing is a key to define effective EDVT strategy. Over testing and over designing cost makes company less agile mainly nowadays as product life cycle and production cost has gone way down. Many times Design of Experiment (DOE) techniques are used to optimize test efforts. More and more features are implemented in software (SW) mainly in SDN (Software defined network) however turning on and off these software features during EDVT changes hardware (HW) operation dramatically. power, bandwidth, interoperability, minimum and maximum configurations etc. Thinking beyond test parameter margin one should consider worst configuration product might see e.g. DVT is not only to see how product functions in accelerated stress test conditions but also to find out how product fails. At the end product’s functionality, quality, robustness, reliability, performance and customer requested features are thoroughly tested by DVT. Electrical design validation is more to assure design indeed meets customer’s requirements. Component vendors assure functionality of components in standalone mode but system companies need to thoroughly check they work within system’s design margin together with all other components on the board.Įlectrical design verification is generally performed to assure product complies internal or external design specification. All these components comes with their own operating tolerances which ads up to system’s operation. While many product functions are implemented into critical major integrated circuits (ASIC, FPGA, CPU, Memories, etc.) still there are a lot many active components along with multilayered printed circuit board (PCB) keeps product bill of material (BOM) long. Electronics products are becoming faster, smaller and more complex day by day.
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