Title :
A nonlinearity-corrected CMOS time digitizer IC with 20 ps single-shot precision
Author :
Mäntyniemi, Antti ; Rahkonen, Timo ; Kostamovaara, Juha
Author_Institution :
Dept. of Electr. Eng., Oulu Univ., Finland
fDate :
6/24/1905 12:00:00 AM
Abstract :
This paper describes the effect of the interpolator nonlinearity to the single-shot precision of a time digitizer and presents a method in which a look-up table (LUT) containing the measured integral nonlinearity (INL) of the interpolators is used as a correcting vector to improve the single-shot precision. The method was tested with a CMOS time digitizer IC with 496 μs range, 29.59 ps LSB resolution and 28 ps RMS single-shot precision. The worst-case single-shot precision of 35 ps caused by the integral nonlinearity of the interpolators was reduced to ≤20 ps in the whole temperature range of -40°C to +60°C by using a single calibration LUT, which contains the measured INLs of the interpolators at room temperature.
Keywords :
CMOS digital integrated circuits; analogue-digital conversion; error correction; integrated circuit design; integrated circuit measurement; interpolation; nonlinear network synthesis; table lookup; timing circuits; -40 to 60 C; 20 ps; 28 ps; 29.59 ps; 35 ps; 496 mus; INL correcting vector; LUT; calibration LUT; digitizer range; digitizer resolution; digitizer single-shot precision; interpolator measured integral nonlinearity; interpolator nonlinearity; look-up table; nonlinearity corrected CMOS time digitizer IC; operating temperature range; picosecond-level accurate time interval measurement; CMOS integrated circuits; Circuit testing; Clocks; Counting circuits; Delay effects; Signal generators; Table lookup; Temperature distribution; Time measurement; Timing;
Conference_Titel :
Circuits and Systems, 2002. ISCAS 2002. IEEE International Symposium on
Print_ISBN :
0-7803-7448-7
DOI :
10.1109/ISCAS.2002.1009890
