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

Claim 17:
18. A built-in self-test circuit for monitoring a digital-to-analog converter that generates an analog output signal by converting a digital input signal, the built-in self-test circuit comprising:
an analog-to-digital converter configured to generate a digital output signal by converting the analog output signal;
a digital test signal generator configured to generate a digital test signal;
an input multiplexer configured to output the digital input signal by selecting one of an external digital signal and the digital test signal; and
an on-time monitor configured to, while the digital-to-analog converter performs a conversion operation to generate the analog output signal by converting the digital input signal that is output by selecting the external digital signal, perform a real-time monitoring operation to monitor whether the digital-to-analog converter operates, based on a result of comparing the digital input signal and the digital output signal, the 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 a comparison alarm signal by comparing the digital output signal and the digital delay signal.