Why test when aging :
Aging stage in the semiconductor test is meaningful for many reasons, before exploring these reasons, we must first clear the true meaning of "test".
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In general semiconductor testing, expensive high-speed automatic test equipment is used to test semiconductors on a test bench with adjustable electrical performance conditions. It can also be performed outside of the nominal performance range to perform functional ( logic ) and parameter ( speed ) tests, with parameters such as signal rise and fall times accurate to picoseconds. Perhaps because the controllable test environment has only one device as an electrical load, the signal is converted very quickly, enabling true device response parameter measurements.
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However, in the aging time, in order to improve the output of the product, it is good to age as many devices as possible. To meet this requirement, multiple devices can be mounted on a large printed circuit board. This board is called an aging board and all the devices on it are connected in parallel. The physical electrical characteristics of large aging boards cannot be compared to small test rigs that test only one device, because capacitive and inductive loads on the aging board can cause trouble for speed testing. So we usually can't do all the functional tests with aging. However, in some cases, it is also possible to perform speed tests in an aging environment using special system design techniques.
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" Testing " in an aging system can refer to any aspect, from basic signal testing for each pin of each device to almost 100% functional testing of all devices on the aging board, all depending on device complexity and location. Depending on the aging test system selected. It can be said that 100% functional testing of any device can be done, but the method used may reduce the device density on the aging board, thereby increasing the overall cost and reducing the yield.
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