Characterization of the eLine ASICs in prototype detector systems for LCLS

Carini

et al. 2014

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Abstract-eLine10k is a fast-frame, 64-channel readout ASIC for SLAC Linac Coherent Light Source (LCLS) detectors. The circuit has been designed to integrate the charge from highcapacitance 2D sensors with rolling shutter and 1D strip sensors. It is suitable for applications requiring large input signal range, on the order of 10 4 photons/pixel/pulse at 8keV (22Me -), and a resolution of half a photon FWHM (500e -r.m.s). 2D sensors with a rolling shutter like the X-ray Active Matrix Pixel Sensor (XAMPS), for which the ASIC has been optimized, present several pixels which are bussed on the same readout line. Large input capacitance to each channel is expected leading to stringent noise optimization requirements. The large required number of pixels per channel, and the fixed LCLS beam period impose limitations on the time available for the readout of each single pixel. Giving the periodic nature of the LCLS beam, the ASIC developed for this application is a time-variant system, providing low-noise charge integration, filtering and correlated doublesampling, and a processing speed up to 500k pixel/s on each channel. To cope with the large input dynamic range, a charge pump scheme has been implemented using a synchronous zerobalance measurement method. It provides on-chip 4-bit coarse digital conversion of the integrated charge. The residual charge is sampled using correlated double sampling into an analog memory, multiplexed and measured with the required resolution using an external ADC. In this paper, the ASIC architecture and performance of the final release are presented.

Section: Resultsmentioning

confidence: 99%

“…The ASIC has also been characterized in several prototype detectors including a 128x256 XAMPS detector. Performance results in these prototypes are reported in [17].…”

Section: The Charge Pump Approachmentioning

confidence: 99%

eLine10k: A High Dynamic Range Front-End ASIC for LCLS Detectors

Carini

et al. 2014

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“…which corresponds to an energy resolution of about 560eV FWHM. Additional experimental results with a different setup will be presented in [11].…”

Section: Resultsmentioning

confidence: 99%

“…The ASIC has also been characterized in several prototype detectors showing spectroscopic capabilities. Performance results in these prototypes are reported in [11].…”

Section: The Charge Pump Approachmentioning

confidence: 99%

eLine100: A Front End ASIC for LCLS Detectors in Low Noise Applications

Freytag

et al. 2014

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Abstract-eLine100 is a fast-frame 96-channel readout ASIC for SLAC Linac Coherent Light Source (LCLS) detectors. The circuit has been designed to integrate the charge from highcapacitance 2D sensors with rolling shutter and 1D sensors. It has a noise floor of 55e -+ 8e -/pF r.m.s at room temperature and it is suitable for applications requiring resolutions on the order of 100e -r.m.s and signals up to 120 photons/pixel/pulse at 8keV (260ke -). 2D sensors with a rolling shutter like the X-ray Charge Pump Sensor (XCPS), for which the ASIC has been optimized, present many pixels which are bussed on the same readout line. This characteristic, together with the fixed LCLS beam period, impose limitations on the time available for the read out of each pixel. Given the periodic structure of the LCLS beam, the ASIC developed for this application is a time-variant system, providing a two-stage low-noise charge integration, filtering, correlated double sampling and a processing speed of up to 250k pixel/s on each channel. To cope with the required input range, a charge pump scheme has been implemented using an asynchronous zero-balance measurement method. It provides on-chip 1-bit coarse analog-to-digital conversion of the integrated charge. The residual charge is sampled using correlated double sampling into an analog memory, multiplexed and measured with the required resolution by an external ADC. In this paper, the ASIC architecture and performances of the final release are presented.

“…1) is a high voltage switcher Application Specific Integrated Circuit (ASIC) that complements the eLine class [4][5][6] of multichannel time-variant integrating front-end ASICs that SLAC has developed for the readout of high capacitance 2D sensors with rolling shutter, and for 1D strip sensors. The class is composed of two front-end ASICs, one designed for high-dynamic range applications (eLine10k [4][5]) and one designed for ultra-low noise applications (eLine100 [6]). Optimized for the XCPS, each channel of the ASIC can independently operate two control lines replicating low voltage control patterns at high voltages.…”

Section: Introductionmentioning

confidence: 99%

sLine: A High Voltage Switcher ASIC for LCLS Detectors with Rolling Shutter

Herbst

et al. 2014

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Abstract-sLine is a fast-frame 128 dual-channel high-voltage switcher ASIC for 2D SLAC LINAC Coherent Light Source (LCLS) detectors with rolling shutter. The ASIC allows each row of pixels in a sensor to be addressed according to a time-division multiplexing scheme, so that the pixels in the selected row are read out and reset in parallel by a multi-channel front-end ASIC. Optimized for the X-ray Charge Pump Sensor, each channel of the ASIC can operate independently, with two control lines replicating low-voltage control patterns at high voltages. The two high-voltage outputs per channel can be arbitrarily set between ±16 V and are able to switch a 1 nF load within about 300 ns. The active outputs are selected by inserting a token into a bidirectional shift register. Control input level for the ASIC are LVDS. In this paper, the ASIC architecture and performance of the final release are presented.