A monolithic, constant-fraction discriminator using distributed R-C delay line shaping
- Oak Ridge National Lab., TN (United States)
- Univ. of Tennessee, Knoxville, TN (United States)
A monolithic, CMOS, constant-fraction discriminator (CFD) was designed and fabricated in a 1.2-{micro}, N-well process. This circuit used an on-chip, distributed R-C delay line to realize the constant-fraction shaping. The delay line was constructed of a 4.8-{micro} wide, 500-{micro} long serpentine layer of polysilicon above a grounded second layer of polysilicon. This line generated about 1.1 ns of delay for a 5-ns risetime signal with a slope degradation of only 15%. The CFD also featured dc feedback for both the arming and zero-crossing discriminators to eliminate timing errors caused by offsets. The entire circuit, including the delay line, required an area of 200 {micro} x 950 {micro}. The timing walk for 5-ns risetime signals over the dynamic range from {minus}20 mV to {minus}2 V was less than {+-} 150 ps. Each channel of the CFD consumed {approximately}15 mW from a single 5-V supply. This CFD is intended for use in the {approximately}15,000 channel lead-scintillator calorimeter and the 6,400 channel RICH system of the PHENIX detector at the Relativistic Heavy Ion Collider (RHIC).
- DOE Contract Number:
- AC05-84OR21400
- OSTI ID:
- 276483
- Report Number(s):
- CONF-951073--
- Journal Information:
- IEEE Transactions on Nuclear Science, Journal Name: IEEE Transactions on Nuclear Science Journal Issue: 3Pt2 Vol. 43; ISSN 0018-9499; ISSN IETNAE
- Country of Publication:
- United States
- Language:
- English
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