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LIROC 1

New

SiPM-based LiDAR read-out chip

Features

  • TRL Technology Readiness Level 4 – ASIC validated in lab environment
  • Detector Read-Out SiPM, SiPM array
  • Number of Channel 64
  • Signal Polarity Both Positive and Negative
  • Sensitivity Trigger on 1/10 photo-electron

Overview

Liroc is a 64-channel front-end ASIC designed to readout Silicon Photomultipliers (SiPMs) for LiDAR applications. It enables precise triggering down to 1/3 photo-electron (p.e.), delivering a low-voltage differential trigger output for each channel. This offers exceptional timing accuracy (better than 20ps FWHM) and excellent separation between double peaks (100% efficiency with 5ns separation between single photo-electrons). Liroc permits rapid counting of single photons, exceeding 100MHz per channel.

Adjusting the SiPM’s high voltage (gain) is achievable using a 6-bit DAC for each channel connected to the ASIC inputs. Precise calibration on the trigger threshold can also be performed channel by channel, facilitated by 7-bit DACs. Liroc’s calibration can be based on the SiPM’s dark noise.

Liroc incorporates a GHz measurement line that includes an RF preamplifier with pole zero cancellation, a fast discriminator, and a low swing LVDS fast driver.

Technical Specifications

TRL (Technology Readiness Level)

4 – ASIC validated in lab environment

Available versions

Liroc : available June 2021

Detector Read-Out

SiPM, SiPM array

Number of Channel

64

Signal Polarity

Both Positive and Negative

Sensitivity

Trigger on 1/10 photo-electron

Timing Resolution

Double peak separation : better than 5ns on single photo-electron

Time resolution : better than 20ps FWHM on single photo-electron

Dynamic Range

up to 15 photo-electron with ToT @ 106 SiPM gain

Packaging & Dimension

FC-BGA 516 20x20mm (Low-inductance flip chip)

Power Consumption

210 mW – supply voltage 1.2V

Inputs

64 voltage inputs with independant SiPM HV adjustments

Outputs

64 CLPS (low common mode LVDS) trigger outputs

Internal Programmable Features
  • 64 HV adjustment for SiPM (64 x 6 bit)
  • trigger threshold programming (10bits), 64 x 7 bit channel-wise threshold adjustment
  • ASIC-wise polarity selector
  • preamp gain adjustment
  • individual trigger masking and cell powering.
Evaluation systems

Evaluation board : Available June 2021

Compare

Compare with Weeroc chip.

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Ordering Options

Code Description
WWLIROC1BAAA LIROC 1 SiPM Analogue Read-out Chip for Lidar and Photon Counting Application  RoHS
WWTBLIROC1BA Testboard for LIROC 1 BGA chip   RoHS

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