Two vernier time-interval digitizers
Review articleOpen access

AbstractTwo vernier time-interval digitizers are described. One, made of EG&G modules, has a minimum useful channel width of about 200 ps. The other, made of MECL II integrated circuitry, works at channel widths greater than 10 ps. They are inexpensive, easily made, linear, stable and fast. In many applications their digitizing rate of 20 MHz (which is variable) yields shorter total busy times than for a TAC-ADC system because of the absence of a leading dead time. For anyone with access to an on-line computer, the MECL II device reduces the cost of digitizing time intervals by more than an order of magnitude over commercially available systems and the device is so easily assembled that almost anyone can make his own. Their range of applicability is discussed and shown to cover all the practical nuclear lifetime and time of flight situations.

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