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F. Anghinolfi, P. Jarron, CERN F. Krummenacher, Smart Silicon System, Lausanne

NINO, an ultra-fast, low-power, front-end amplifier discriminator (developed for the Time-Of-Flight experiment in ALICE). F. Anghinolfi, P. Jarron, CERN F. Krummenacher, Smart Silicon System, Lausanne E. Usenko, IHEP Protvino M.C.S. Williams, INFN Bologna.

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F. Anghinolfi, P. Jarron, CERN F. Krummenacher, Smart Silicon System, Lausanne

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  1. NINO, an ultra-fast, low-power, front-end amplifier discriminator (developed for the Time-Of-Flight experiment in ALICE) F. Anghinolfi, P. Jarron, CERN F. Krummenacher, Smart Silicon System, Lausanne E. Usenko,IHEP Protvino M.C.S. Williams, INFN Bologna F. Anghinolfi CERN

  2. NINO, an ultra-fast, low-power, front-end amplifier discriminator NINO Electronic channel Differential cathode-anode signal. LVDS outputs 500fC average charge, up to few pC. Typical threshold at 50fC. < 3000 el. Noise @ 10pF Cdet Tunable input impedance (40-75W) 1ns front edge delay vs. input < 25 ps rms front edge time jitter Pulse width variable with input charge F. Anghinolfi CERN

  3. Very fast MRPC signal (100ps rise time) NINO, an ultra-fast, low-power, front-end amplifier discriminator Input stage • Common gate circuit with very high bandwidth (<1ns peaking time) • The input charge is flowing through the output load, while the input impedance is low • Input impedance (1/gmsb) is tuned to match the impedance of detector signal transmission lines • Stable (no signal feedback, fully differential circuit) v=ZL.i Input Impedance (1/gmsb) Input stage (half of fully differential circuit) F. Anghinolfi CERN

  4. NINO, an ultra-fast, low-power, front-end amplifier discriminator Current expression Input stage biasing circuit Rp Source impedance of M2 If M=2 Channel input device is same size and bias as M2 F. Anghinolfi CERN

  5. NINO, an ultra-fast, low-power, front-end amplifier discriminator • Low bandwidth feedback circuit to control input stage common mode DC settings • Th+/Th- are external inputs (voltages) to create current imbalance on input stage differential branches Input stage currents Diff pair outputs sense F. Anghinolfi CERN

  6. NINO, an ultra-fast, low-power, front-end amplifier discriminator i1 i2 Diff pair outputs sense • Fully differential structure from input to output • Gain is obtained by 4 consecutive stages as . High bandwidth low gain stages (G=6, BW=500Mhz) • Last stage is a open-drain differential pair to provide LVDS like outputs 2 2 F. Anghinolfi CERN

  7. NINO, an ultra-fast, low-power, front-end amplifier discriminator • Input stage, DC condition and Threshold setting 2 • Gain is obtained by 4 cascaded high bandwidth low gain stages (G=6, BW=500Mhz) Fully differential structure from input to output F. Anghinolfi CERN

  8. NINO, an ultra-fast, low-power, front-end amplifier discriminator Simulation results Input stage Channel Outputs 20 fC to 200fC input charge 100 fC to 2.1pC input charge, 50fC threshold F. Anghinolfi CERN

  9. NINO, an ultra-fast, low-power, front-end amplifier discriminator Delay and Width Time Measurement (test bench) NINO channel delay is only a fraction of this delay measurement F. Anghinolfi CERN

  10. NINO, an ultra-fast, low-power, front-end amplifier discriminator Pulse Width Measurement vs. Simulation (test bench) F. Anghinolfi CERN

  11. NINO, an ultra-fast, low-power, front-end amplifier discriminator 200 ps Time Jitter Measurement (test bench) Differential output jitter snapshot F. Anghinolfi CERN

  12. NINO, an ultra-fast, low-power, front-end amplifier discriminator Time slewing versus input charge (test beam, with MRPC detector) Pulse width measurement can be used for time walk correction F. Anghinolfi CERN

  13. NINO, an ultra-fast, low-power, front-end amplifier discriminator Contributions to 41ps resolution Time resolution and efficiency (test beam, with MRPC detector) 99.9% Quoted < 5ps now F. Anghinolfi CERN

  14. NINO, an ultra-fast, low-power, front-end amplifier discriminator • IBM 0.25 mm CMOS technology • 8 channels, 2x4 mm2 chip • Channel power is 27mW • Time resolution <5ps rms • Delay time 1ns • Pulse Width 2 to 8ns (or 16 to 21ns) • 3000 el. Noise @ Cdet=10pF The NINO ASIC bonded to the PCB F. Anghinolfi CERN

  15. NINO, an ultra-fast, low-power, front-end amplifier discriminator F. Anghinolfi CERN

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