Patent ID: 6051968
Filing Date: 2000-04-18
Classification: G01R

Abstract:
A test board for testing an integrated circuit device by relaying electrical signals between the integrated circuit device and a tester, the test board comprising:a socket for receiving the integrated circuit device, and having a socket input terminal;a capacitor having first and second capacitor terminals, the first capacitor terminal being connected to a negative supply voltage;a first switch having a first fixed terminal and first and second switching terminals, the first fixed terminal being connected to the socket input terminal;a second switch having a second fixed terminal and third and fourth switching terminals, the second fixed terminal being connected to the second capacitor terminal, and the fourth switching terminal being connected to the second switching terminal of the first switch; anda capacitor charging circuit having a charging input terminal connected to the first switching terminal of the first switch and a charging output terminal connected to the third switching terminal of the second switch,wherein when in a first state, the first switch connects the first fixed terminal to the second switching terminal, and the second switch connects the second fixed terminal to fourth switching terminal, so that the first and second switches connect the capacitor to the socket input terminal, and when in a second state, the first switch connects the first fixed terminal to the first switching terminal, and the second switch connects the second fixed terminal to the third switching terminal, so that the first switch connects the charging input terminal to the socket input terminal and the second switch connects the charging output terminal to the capacitor.