Patent ID: 11867757
Assignee: SAMSUNG ELECTRONICS CO., LTD.
Field: Basic communication processes (Electrical engineering)
Classification: CPC G  H | IPC G  H

Claim 14:
15. A semiconductor integrated circuit comprising:
a first input multiplexer configured to output a digital input signal by selecting one of a digital test signal and an external digital signal that is provided from an external device outside the semiconductor integrated circuit;
a digital-to-analog converter configured to perform a first conversion operation to generate an analog output signal by converting the digital input signal and provide the analog output signal corresponding to the external digital signal to the external device;
a second input multiplexer configured to output an analog input signal by selecting one of an analog test signal and an external analog signal that is provided from the external device;
an analog-to-digital converter configured to perform a second conversion operation to generate a digital output signal by converting the analog input signal and provide the digital output signal corresponding to the external analog signal to the external device; and
a built-in self-test circuit configured to, while the digital-to-analog converter performs the first conversion operation, perform a real-time monitoring operation to generate a comparison alarm signal based on the digital input signal and the analog output signal, the comparison alarm signal indicating whether the digital-to-analog converter operates, the built-in self-test circuit including an on-time monitor comprising:
a delay circuit configured to generate a digital delay signal by delaying the digital input signal based on a digital delay amount of the digital-to-analog converter and an analog delay amount of the analog-to-digital converter, and
a comparison circuit configured to generate the comparison alarm signal by comparing the digital output signal and the digital delay signal.