SKIROC is a 64-channel front-end ASIC designed to readout silicon PIN diodes. Each channel is made of a variable-gain and low-noise charge preamplifier followed by two shapers – one with a gain of 1 and the other with a gain of 10 – to provide a charge measurement from 0.2 fC up to 10 pC. A time tagging is performed by a 12-bit TDC ramp. The charges and times are stored in a 15-depth Switched Capacitor Arrays (SCA), the values of which are converted by a multi-channel 12-bit Wilkinson ADC and sent to an integrated 4 Kbytes memory. The analog value of the charge is also available on an output pin. The trigger chain is composed of a high gain fast shaper and a discriminator and allows each channel to auto trigger down to 0.2 fC. Thresholds of the 64 discriminators are set by a common 10-bit DAC and an individual 4-bit DAC per channel. Each discriminator output is sent to an 8-bit delay cell (delay time tunable between 100 ns and 300 ns) to provide the Hold signal for the SCA cells of the slow channel. The power consumption is around 6.2 mW/channel and each stage can beindividually shut down when not used. 616 slow control parameters are available to set various configurations and ensure the versatility of the chip.
|TRL Technology Readiness Level||6 - Application prototype available|
|Detector Read-Out||Si PIN Diodes|
|Number of Channel||64|
|Sensitivity||Trigger on 0.2fC|
|Timing Resolution||1 ns RMS for 4fC|
|Dynamic Range||10 pC, Integral Non Linearity <1%|
6.2 mW/ch, power supply : 3.3 V
|Inputs||64 current inputs|
1 multiplexed analog charge output that can be daisy chained
12-bit charge and time measurment
Wired 0R of the 64 discrimators
Multiplexed trigger outputs
|Internal Programmable Features||Common gain adjustment for the input preamps from 400fF up to 6pF (4 bits), common trigger threshold adjustement (10 bits) and individual threshold (4 bits), 12-bit charge and time measurement, 64 trigger masks, multiplexed analog outputs, multiplexed trigger outputs|
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