A transimpedance amplifier based on a LTPS process operated in alkali vapor

We present a transimpedance amplifier (TIA) based on a low temperature polysilicon (LTPS) process, which is operated in a rïactive atmosphere of alkali vapor contained in a glass cell. We successfully encapsulated the electronics and present a sealing method for the glass cell, which is compatible with the employed LTPS process and shows long term leak tightness in the ultra high vacuum regime. The properties of the amplification circuit are then discussed.