Patent ID: 11921158
Assignee: SAMSUNG ELECTRONICS CO., LTD.
Field: Measurement (Instruments)
Classification: CPC G | IPC G

Claim 9:
10. A probe card comprising:
first and second probe tips;
a fan-out buffer including:
a first channel including a first delay circuit configured to adjust a first delay time of a calibration test signal depending on a first delay control signal,
a second channel including a second delay circuit configured to adjust a second delay time of the calibration test signal depending on a second delay control signal,
a first edge-to-pulse converter configured to detect a first edge included in a first time domain reflectometry (TDR) waveform of an output terminal of the first channel and to generate a first start pulse signal including a first pulse,
a second edge-to-pulse converter configured to detect a first edge included in a second TDR waveform of an output terminal of the second channel and to generate a second start pulse signal including a second pulse,
a stop pulse signal generator configured to generate a stop pulse signal including a first stop pulse by performing an AND operation on the first pulse and the second pulse, and
a first delay control signal generator configured to calculate a phase difference between the first pulse and the first stop pulse and to generate the first delay control signal by using a calculation result such that a skew between the first pulse and the second pulse is calibrated;

a first transmission circuit connected between the first channel and the first probe tip; and
a second transmission circuit connected between the second channel and the second probe tip.