Patent ID: 9041572
Filing Date: 2015-05-26
Classification: H03M

Abstract:
1. A method of testing a digital-to-analog converter (DAC), the method carried out iteratively for a plurality of digital test signal values, the method comprising: providing the digital test signal to a DAC under test and to a servo; providing, by the DAC under test to a summer, an analog test signal, including converting the digital test signal to the analog test signal; providing, by the summer to an observation latch, a summed signal, including summing the analog test signal and an analog offset signal, the analog offset signal received from a second DAC; providing, by the observation latch to the servo, a sample of the summed signal; providing, by the servo to the second DAC in dependence upon the sample and the digital test signal, a digital offset signal, wherein the second DAC converts the digital offset signal to the analog offset signal; and storing, as a digital observation, the digital offset signal.