Patent ID: 6653855
Filing Date: 2003-11-25
Classification: G01R

Abstract:
An external test auxiliary device for use in testing a semiconductor device, the auxiliary device comprising:a connector having a plurality of terminals; a BOST (built-off self-test) board substrate having the connector mounted thereon; and an external self-test circuit formed on the BOST board substrate, wherein the external self-test circuit includes a test signal transmission section which transmits a predetermined test signal to a specific terminal provided in the connector on the basis of a control signal input from the specific terminal provided in the connector; a response signal receiving section which, in response to the test signal, receives a response signal input to a specific terminal provided in the connector; a signal analysis section which analyzes the response signal, thereby determining whether or not the signal is an appropriate signal; and a result signal transmission section which transmits, to a specific terminal provided in the connector, a test result signal representing whether or not the response signal is appropriate; wherein the test signal transmission section includes a digital transmission section for transmitting a digital signal as the test signal, and the response signal receiving section includes an analog-to-digital converter which receives an analog signal input in response to the digital signal as a response signal and converts the response signal into a digital signal.