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The LAB4D is a new application-specific integrated circuit (ASIC) of theLarge Analog Bandwidth Recorder and Digitizer with Ordered Readout (LABRADOR)family, for use in direct wideband radio frequency digitization such as is usedin ultrahigh energy neutrino and cosmic ray astrophysics. The LAB4D is a singlechannel switched-capacitor array (SCA) 12-bit sampler with integratedanalog-to-digital converters (ADC), developed in the TSMC 0.25um process. TheLAB4D, operating at 3.2GSa/s, contains 4096 total samples arranged in 32windows, for a total record length of 1280ns. The 3dB bandwidth isapproximately 1.3GHz, with a directly-coupled 50ohm input. This represents afactor of 16 increase in the sample depth and an increase in analog bandwidthand sampling depth in comparison to the previous generation LAB3 digitizer.Individually addressable windows allow for sampling and digitization to occursimultaneously, leading to nearly deadtime-free readout for kHz readout rates.All biases and current references are generated via internal digital-to-analogconverters (DACs), resulting in a stand-alone digitizer with no additionalsupport circuitry. In addition, the LAB4D contains sample cell timebasetrimming capabilities, reducing the intrinsic sample-to-sample time variance toless than 5ps; an improvement of about 80%. This allows the LAB4D to be used inprecision timing applications with minimal post-hoc calibration.

LAB4D: A Low Power, Multi-GSa/s, Transient Digitizer with Sampling Timebase Trimming Capabilities