LeCroy MQT300A - charge to time converter

Conference · Wed Dec 31 04:00:00 EST 1997

OSTI ID:577705

Yamrone, B; Roberts, K; Kelly, J ^[1]

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1. LeCroy Corp., Chestnut Ridge, NY (United States)

The MQT300A was developed to offer high resolution (12 bit) and wide dynamic range (18 bit) with reasonable cost, high density and fast conversion time (< 10 {mu}s). The reduced conversion time has allowed its first users the option to choose whether or not to develop a fast clear strategy as part of their trigger system. It can also be used for chamber-mounted applications allowing compact digital data cabling to the remote TDC. The MQT300A is a custom development produced in collaboration with the BELLE collaboration at KEK and the CLEO group at Cornell. In this collaboration Cornell and KEK were partners with LeCroy in both the specification and evaluation of the first prototypes. LeCroy has been responsible for the remainder of the project. The MQT300A is available in LeCroy modules and also as a separate monolithic. The MQT300A was designed to take advantage of the latest generation of multi-hit TDCs, for example the LeCroy 1877S FASTBUS ADC. The 1877S was specifically optimized to improve conversion time and to intelligently minimize the data record size for the MQT300A application. A prototype part was designed and fabricated using a custom bipolar process. Though fully functional it did not meet several important performance specifications. A reiteration with significant redesign of two sections resulted in a part that meets all specifications. The unique encoding algorithm used to provide auto-ranging has had a U.S. patent allowed. The part is now commercially available in production volumes.

• OSTI ID: 577705
• Report Number(s): CONF-970565--
• Country of Publication: United States
• Language: English

Related Subjects

42 ENGINEERING
44 INSTRUMENTATION
INCLUDING NUCLEAR AND PARTICLE DETECTORS
ANALOG-TO-DIGITAL CONVERTERS
DESIGN
FASTBUS SYSTEM
MEASURING INSTRUMENTS
PERFORMANCE
TIMING CIRCUITS
TRIGGER CIRCUITS