Speaker
Description
The super tau-charm facility(STCF) is a proposed e+e- collider producing a data sample 100 times higher than present tau-charm factory (BEPCII). The inner tracker of STCF should have certain position resolution, time resolution, charge measurement function and low power consumption and one of its alternative options is semiconductor detector based on monolithic active pixel sensor (MAPS). However existing readout structures of MAPS either have high power consumption or cannot readout ToT information correctly. To satisfy these requirements, a novel readout scheme has been developed in a full-custom manner. On the one side, it uses VCO in super pixels to record time-of-arrival (ToA) at 500MHz with extremely low static power consumption. On the other side, outputs of front-end circuits are combined through OR gates with the interval of multiple pixels in both directions, which avoids the loss of time-over-threshold (ToT) caused by OR gates. Finally, a group address is read out simultaneously to prevent degradation of position resolution caused by channels merging. A readout calculation model has been established based on MATLAB and simulation results illustrate the readout efficiency is higher than 99% until hit rate becomes 10 MHz/cm2, which corresponds to more than 10 times average counting rate of STCF ITK. According to simulation, the digital power consumption is lower than 30 mW/cm2 while timing resolution of ToA is 2 ns.
| Minioral | Yes |
|---|---|
| IEEE Member | No |
| Are you a student? | Yes |
