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Compact multi-channel radiation detectors rely on low noise front-endapplication specific integrated circuits (ASICs) to achieve high spectralresolution. Here, a new ASIC developed to readout virtual Frisch-grid cadmiumzinc telluride (VFG CZT) detectors for gamma ray spectroscopy is presented.Corresponding to each ionizing event in the detector, the ASIC measures theamplitude and timing at the anode, the cathode and four pad sense electrodesassociated with each sensor in a detector array. The ASIC is comprised of 52channels of which there are 4 cathode channels and 48 channels which can beconfigured as either anode channels with a baseline of 250 mV or pad sensechannels to process induced signals with a baseline of 1.2 V. With a staticpower dissipation of 3 mW, each channel performs low-noise chargeamplification, high-order shaping, peak and timing detection along with analogstorage and multiplexing. The overall channel linearity was better than $\pm$ 1% with timing resolution down to 700 ps for charges greater than 8 fC in the 3MeV range. With a 4 x 4 array of 6 mm x 6 mm x 20 mm virtual Frisch-grid barsensors connected and biased, an electronic resolution of $\approx$ 270 rms$e^{-}$ for charges up to 100 fC in the 3.2 MeV range was measured. Spectralmeasurements obtained with the 3D correction technique demonstrated resolutionsof 1.8 % FWHM at 238 keV and 0.9 % FWHM at 662 keV.

Front-end ASIC for Spectroscopic Readout of Virtual Frisch-Grid CZT Bar Sensors