The TGV32, a 32-channel preamplifier-multiplicity discriminator chip for th
e multiplicity vertex detector (MVD) at PHENIX, is a unique silicon preampl
ifier in that it provides both an analog output for storage in an analog me
mory and a weighted summed-current output for conversion to a channel multi
plicity count. The architecture and test results of the chip are presented.
Details about the design of the preamplifier, discriminator, and programma
ble digital-analog converters performance as well as the process variations
are presented. The chip is fabricated in a 1.2 mu m, n-well, complementary
metal-oxide-semiconductor process. (C) 1999 American Institute of Physics.