autonomous vehicle 5 2

What is Analog-to-digital converter?

The interface between Analog and digital signal processing is called an Analog-to-digital converter. The temporal range of pulses is a few nanoseconds with a sampling rate in the range of several 100 MHz. Measurement of a high resolution of the voltage values is required with ensuring a low inherent noise of Circuitry implies.

SAR, known as successive approximation method is used for the converter to meet those requirements to work appropriately where the converted voltage is increased in iterative steps by dissolving 1 bit per clock phase. The purpose of such a function is to compare the reference voltage with an input voltage in each step to be generated by a DA-converter. The input voltage is depended on whether it is higher or lower than the DA converter voltage than the reference voltage by the next step by half the step size of the last step upwards or changed at the bottom. The ADC is the pipeline with a variant of such procedure with iteration steps realized in a successive circuit stage.

The ADC requirements can also be defined by the power consumption of the entire system about the number of laser pulses where the 3D image is required. The evolution of a high sampling rate and numerous photodiodes are done in parallel.


McCormack, P., Kwok, K. “Industrial RADAR/LiDAR System”, ECE, National Semiconductor, 2005.
Kawahara, K., Ikeda H., Mizuno, M., “Development of Pulse Detection IC for Space LiDAR”, Jon Wiley & Sons, Inc. Trans. JSASS Aerospace Tech. Japan, Vol. 8, No. ists27, pp. Td_17-Td_22, 2010.
Trends in der Automobil-Sensorik. PageNo. 26. Automobil- Sensorik 2 (Systeme, Technologien und Applikationen by Thomas Tille (Hrsg.)

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