DocumentCode :
1851275
Title :
A monolithic, constant-fraction discriminator using distributed R-C delay line shaping
Author :
Simpson, M.L. ; Young, G.R. ; Jackson, R.G. ; Xu, M.
Author_Institution :
Oak Ridge Nat. Lab., TN, USA
Volume :
1
fYear :
1995
fDate :
21-28 Oct 1995
Firstpage :
292
Abstract :
A monolithic, CMOS, constant-fraction discriminator (CFD) was designed and fabricated in a 1.2-μ N-well process. This circuit uses an on-chip, distributed R-C delay line to realize the constant-fraction shaping. The delay line is constructed of a 4.8-μ wide, 500-μ long serpentine layer of polysilicon above a grounded second layer of polysilicon. This line generates about 1.1 ns of delay for a 5-ns risetime signal with a slope degradation of only 15%. The CFD also features DC feedback for both the arming and zero-crossing discriminators to eliminate timing errors caused by offsets. The entire circuit, including the delay line, requires an area of 200 μ×950 μ. The timing walk for 5-ns risetime signals over the dynamic range from -20 mV to -2 V was less than ±150 ps. Each channel of the CFD consumed ~15 mW from a single 5-V supply
Keywords :
RC circuits; detector circuits; discriminators; nuclear electronics; 1.2-μ N-well process; 5-ns risetime signal; 5-ns risetime signals; CFD; DC feedback; arming discriminators; constant-fraction shaping; distributed R-C delay line shaping; monolithic CMOS constant-fraction discriminator; monolithic constant-fraction discriminator; offsets; on-chip distributed R-C delay line; serpentine polysilicon layer; single 5V supply; slope degradation; timing errors; timing walk; zero-crossing discriminators; CMOS process; Capacitors; Circuits; Computational fluid dynamics; Delay lines; Detectors; Feedback; Laboratories; Signal generators; Timing;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Nuclear Science Symposium and Medical Imaging Conference Record, 1995., 1995 IEEE
Conference_Location :
San Francisco, CA
Print_ISBN :
0-7803-3180-X
Type :
conf
DOI :
10.1109/NSSMIC.1995.504229
Filename :
504229
Link To Document :
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