TOPIC : Introduction to BIST and types of BIST

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TOPIC : Introduction to BIST and types of BIST UNIT 5 : BIST and BIST Architectures Module 5.1 Introduction to BIST TOPIC : Introduction to BIST and types of BIST

Introduction The complexity of circuits is increasing day by day. So testing the circuit from input, output pads becomes laborious and time consuming. Hence there is a necessity to reduce the complexity of testing. For this purpose Built-In Self-Test (BIST) is developed.

BIST It is a design technique in which additional circuits are added to the functional blocks which enable testing of the circuit by itself. It is a combination of the concepts of built-in test and self-test. By using the concept of BIST, there is a great reduction in the testing time.

Types of BIST There are broadly two methods of carrying BIST: Online BIST Concurrent BIST Non-concurrent BIST Offline BIST Functional BIST Structural BIST

Online BIST In online BIST, the circuit may be made to test itself without being disconnected from the system. Concurrent online BIST: Allowing the testing to be carried out while the circuit performs its normal operation. Non-concurrent online BIST: Normal operation is put off and only the testing would be carried out. The test process can be interrupted any time so that the normal operation can resume.

Offline BIST In offline BIST, the circuit is disconnected from its normal operation and testing is carried out. It is applicable at manufacturing, field, operational levels. It uses test pattern generators (TPG) and output response analyzers (ORA). It cannot detect errors at first occurrence which is possible with many online BIST techniques.

Contd … Functional offline BIST: The execution of the test is based on the functional description of circuit under test (CUT) and employs a functional fault model. Structural offline BIST: The execution of the test is based on the structure of the CUT which uses explicitly structural fault models.