AIDA design review 12 November 2008 Davide Braga Steve Thomas ASIC Design Group 12 November 2008

preAmplifier bias In order to improve stability and optimize performance, the following signals can now be selected using an internal reference: First two stages bias current Output surce follower bias current Compensation resistor Bias signals are buffered (locally in each channel the most critical, globally the rest) to avoid crosstalk Fast comparator implemented, with baseline following the preamp’s output

Layout Maximum effort to: Avoid parasitics inside the single channel Avoid crosstalk between channels Reduce power supply impedance

Layout preAmplifiers (2 channels) and their feedbacks loops ~50% shaper completed x10stage and fast comparator ~50% peak holds completed bias block (global block) to be started Top level checking to follow