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

Caragiulo, P.; Dragone, A.; Herbst, R.; Haller, G.

doi:10.1109/tns.2014.2305160

“…The class is composed of two front-end ASICs, one designed for high-dynamic range applications (eLine10k) and one designed for ultra-low noise applications (eLine100 [1]). The class also include a switcher ASIC (sLine [2]) used to control the operation of column-parallel readout 2D sensors with rolling shutter, such as the X-ray Active Matrix Pixel Sensor (XAMPS), developed at Brookhaven National Laboratory. Since, in FEL applications, photons hit sensors simultaneously, only integrating detectors can be used.…”

Section: Introductionmentioning

confidence: 99%

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

Dragone

¹

,

Caragiulo

²

,

Carini

³

et al. 2014

IEEE Trans. Nucl. Sci.

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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.

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“…The class is composed of two front-end ASICs, one designed for high-dynamic range applications (eLine10k [1]) and one designed for ultra-low noise applications (eLine100). The class also includes a switcher ASIC (sLine [2]) used to control the operation of column-parallel readout 2D sensors with rolling shutter such as the X-ray Charge Pump Sensor (XCPS), based on a concept by Pavel Rehak from Brookhaven National Laboratory [3] and under development at SLAC. In FEL applications, photons hit sensors simultaneously; therefore only integrating detectors can be used.…”

Section: Introductionmentioning

confidence: 99%

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

Dragone

¹

,

Caragiulo

²

,

Freytag

³

et al. 2014

IEEE Trans. Nucl. Sci.

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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.

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“…When the gating potentials are reversed, the charge is transferred to the anode. The integration and read out phases of pixels in the same row are controlled by a dedicated switcher ASIC (sLine [2]), which effectively implements the operation of a rolling shutter. Columns of the sensor are read out in parallel by the front-end ASIC.…”

Section: Introductionmentioning

confidence: 99%

“…The residuals conversion is performed with external 14-bit ADCs. The actual version of the ASIC has 96 channels, a size of 6.8×5mm 2 and was fabricated in TSMC CMOS 0.25µm technology. After a description of the detector systems for which the eLine class is designed, the ASIC architecture will be discussed in section III.…”

Section: Introductionmentioning

confidence: 99%

eLine100: A front end ASIC for LCLS detectors in low noise applications

Dragone¹,

Caragiulo²,

Freytag³

et al. 2012

2012 IEEE Nuclear Science Symposium and Medical Imaging Conference Record (NSS/MIC)

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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.

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

Cited by 3 publications

References 10 publications

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

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

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

eLine100: A front end ASIC for LCLS detectors in low noise applications

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