A discriminator and shaper circuit realized in CMOS technology for BABAR
Abstract
An analog chip is designed to receive from a PM, through a 50 Ω coaxial cable, signals rising in 3 ns, falling in 8 ns, and to provide: digital signals for timing purposes,
multiplixed analog output, proportional to the input, for spectral measurements; there are 8 channels per chip with a common gain adjustment for the preamplifier, and individual control for the offset and threshold setting. The discriminator sensitivity is 2 mV. The dynamic range is from 2 to 100 mV. The noise equivalent at the input is ≈100 μV. The RMS time dispersion is less than 550 ps for 3 mV threshold. The shaping amplifier is of bipolar shape with 80 ns peaking time and 2.5 V mean output voltage. The cross talk between channels is less than 2%.- Publication:
-
Nuclear Instruments and Methods in Physics Research A
- Pub Date:
- February 1998
- DOI:
- 10.1016/S0168-9002(97)01290-4
- Bibcode:
- 1998NIMPA.409..322A