Precyzyjny przetwornik czas-liczba z powielaniem i uśrednianiem czasu trwania impulsu

• Autorzy: Szplet R. , Poteralski M.

Warianty tytułu

EN

A high precision time-to-digital converter based on pulse repetition and time width averaging

• Języki publikacji: PL

Abstrakty

EN

This paper describes the design and test results of a time-to-digital converter with 1.9 ps resolution and measurement uncertainty below 12.2 ps (Fig. 4). The time-to-digital conversion is based on time width averaging. Information about the measured time interval is contained in the width of a pulse that circulates in a closed delay loop and its width is measured by the counting method with use of a high frequency multiphase clock (Fig. 1). The converter resolution is directly proportional to the number of cycles of the measured pulse in the delay loop, the number of phases and frequency of a clock used (2). However, increase in the number of loop cycles causes growth in the jitter of circulating pulse edges that finally leads to deterioration in the measurement precision. Therefore, in order to obtain the highest precision of conversion, the number of cycles for which the converter provides the smallest measurement uncertainty was experimentally determined. In addition, to minimize a disadvantageous impact of unequal propagation times of the loop elements for the rising and falling pulse edges on the value of the measured time interval, the information about the measured time interval is contained between the rising edges of the pulse-pair instead of the opposite (rising and falling) edges of a single pulse (Fig. 2). The converter was implemented in a programmable device Spartan-6 manufactured by Xilinx. (Xilinx).

Słowa kluczowe

PL

precyzyjna metrologia czasu; przetwornik czas-liczba; metoda uśredniania; układy FPGA

EN

precise time metrology; time-to-digital converter; averaging method; FPGA devices

• Wydawca: Wydawnictwo PAK
• Czasopismo: Pomiary Automatyka Kontrola
• Rocznik: 2012
• Tom: R. 58, nr 7
• Strony: 569--571
• Opis fizyczny: Bibliogr. 7 poz., rys., wykr., wzory

Twórcy

autor

Szplet R.

autor

Poteralski M.

• Wojskowa Akademia Techniczna, Instytut Telekomunikacji, Gen. Sylwestra Kaliskiego 2, 00-908 Warszawa,

Bibliografia

• [1] Kalisz J.: Review of methods for time interval measurements with picosecond resolution; Metrologia 41, 2004, str. 17-23.
• [2] Jansson J., Mantyniemi A., Kosamovaara J.: A CMOS time-to-digital converter with better than 10 ps single-shot resolution; Journal of Solid-State Circuits, vol. 41, no. 6, 2006, str. 1286-1296.
• [3] Szplet R., Jachna Z., Kalisz J.: A Flash Time-to-Digital Converter with Two Independent Time Coding Lines, IEEE 2011 ADC Forum, Orvieto, Italy, 2011.
• [4] Wu J., Shi Z.: The l0-ps Wave Union TDC: Improving FPGA TDC Resolution beyond Its Cell Delay, IEEE Nuclear Science Symposium Conference Record, 2008, str. 3440-3446.
• [5] Szplet R., Kalisz J., Jachna Z.: A 45 ps time digitizer with two-phase clock and dual-edge two-stage interpolation in Field Programmable Gate Array device; Measurement Science and Technology, vol. 20, no. 2 (025108), 2009.
• [6] Time interval averaging; Hewlett-Packard Application Note 162-1, 1970.
• [7] Szplet R., Jarzyński S.: Wysokorozdzielczy konwerter czasowo-cyfrowy z próbkowaniem impulsu, PAK 2009 nr 08, str. 642-644.