Signal output circuit, and test apparatus

• Main Author: Negishi, Toshiyuki
• Format: Patent
• Language: English
• Published: 06.01.2009

A signal output circuit for outputting an output signal in accordance with a predetermined system timing is provided. The signal output circuit includes a shift register that delays an input signal in accordance with the system timing, a flip-flop that receives the input signal delayed by the shift register in response to a clock signal supplied thereto, and outputs the input signal as the output signal, and an initializing section that measures a delay amount achieved by the shift register and judges whether the measured delay amount is in accordance with the system timing. The initializing section includes an input section that inputs a reference signal into the shift register, a counting section that counts the number of pulses of the clock signal by using the reference signal as a trigger, and causes inputting of the clock signal into the flip-flop to be suspended when a value indicating a result of the counting reaches a value set in accordance with the system timing, a measuring section that measures a signal output from the flip-flop, and a judging section that judges whether the signal measured by the measuring section corresponds to the reference signal.