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time to digital converter (TDC)

When converting a physical quantity into a digital value, the physical quantities of the sensors - pressure, temperature, flow, speed, etc. - are first converted into an intermediate quantity before this is then converted into the digital value. - are first converted into an intermediate variable before this is then converted into the digital value. Commonly known and used is the conversion to a voltage, which is then converted to the digital value by means of an A/D converter. Just like a voltage, time

can be used as an intermediate variable and the time differences can then be converted into a digital value. In converting the physical quantity into a time difference, one works by charging RC elements. The principle of time conversion is realized in time to digital converter, Time to DigitalConverter

(TDC).

Time to Digital Converter (TDC), Photo: Acam

Time to Digital Converter (TDC), Photo: Acam

An important characteristic of converters, both A/D converters and TD converters, is resolution. In order to achieve the highest possible resolution in time-to-digital converters, the time resolution of the converters must be correspondingly high. According to the principle, the time difference to be measured is compared with the running times

in gates. It is recorded how many gate propagation times the time difference corresponds to. The time difference to bemeasured is fixed by start and stop signals and

the digital signal

is derived from the number of gate run times. The TD converters offered on the market achieve time resolutions of a few picoseconds (ps).

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Englisch: time to digital converter - TDC
Updated at: 16.07.2018
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Translations: DE