A BiCMOS integrated charge to amplitude converter

This paper describes a fast two channel gated charge to amplitude converter (QAC) which has been designed with the 1.2 /spl mu/m BiCMOS technology from AMS (Austria Mikro Systeme). It can integrate fast negative impulse currents up to 100 mA. Associated with an audio 18 bit low cost ADC, it can easily be used to make a 12 to 13 bit QDC. The problems of current to current conversion, pedestal and offset stability are discussed.