Abstract
Timepix3 is a multi-purpose readout ASIC for hybrid pixel detectors. It can measure time and amplitude simultaneously by employing time-of-arrival (ToA) and time-over-threshold (ToT) techniques. Both methods are systematically affected by timewalk. In this paper, a method for pixel-by-pixel calibration of the time response is presented. Assemblies of Timepix3 ASICs bump-bonded to thin planar silicon pixel sensors with thicknesses of 50 μ m, 100 μ m and 150 μ m are calibrated and characterised in particle beams. For minimum ionising particles, time resolutions down to 0.72 ± 0.04 ns are achieved.
Highlights
The ASICThe Timepix ASIC is comprised of a matrix with 256 by 256 square pixels with 55 μm pitch
Each pixel consists of a charge sensitive amplifier (CSA) with a feedback capacitor for amplification and shaping of the input signal
The method uses a combination of electrical test pulses and beam data and requires only about 100 hits per pixel from minimum ionising particles
Summary
The Timepix ASIC is comprised of a matrix with 256 by 256 square pixels with 55 μm pitch. In the operating mode used in this work, the ASIC employs a 10 bit ToT and a 14 bit ToA counter running at a 40 MHz clock for simultaneous measurements of amplitude and time. In this mode, the noise per pixel is approximately 90 e-. If the input signal rises above this value, the discriminator starts the ToT counter which runs until the signal falls below the threshold again. Due to the use of a constant value threshold, the time at which the signal crosses the threshold depends on the signal amplitude TimePix thrtehsrheoslhdold thrtehsrheoslhdold timteime threthsrheoslhdold time-over-threshold time-over-threshold time shift time shift signal threshold time-over-threshold time sigsniaglnal signsiaglnal (a)
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