The Physics of the B Factories

This work is on the Physics of the B Factories. Part A of this book contains a brief description of the SLAC and KEK B Factories as well as their detectors, BaBar and Belle, and data taking related issues. Part B discusses tools and methods used by the experiments in order to obtain results. The results themselves can be found in Part C

A Switched Capacitor Based Charge-to-Time Converter

A readout scheme that employs switched-capacitor-array integrated circuits and a simple voltage-to-time converter to capture, delay, and time-encode analog waveforms is described. Test results from a 16-channel prototype board are presented. 1 Introduction The first-level trigger decision times of many upcoming high-energy and nuclear physics experiments will be one microsecond or more. For timing (digital) signals, trigger latencies of this order are readily accommodated by the new generation of pipelined time-to-digital converters (TDC's) [1--3], which are typically capable of common-stop multi-hit operation and have full-scale ranges of several microseconds. However, the delay of analog signals presents a more difficult problem. The traditional approach of transmission-line delay cables is impractical for delays much beyond 500 ns, especially for systems Preprint submitted to Elsevier Science 19 May 1996 with large numbers of channels. Although less bulky, lumped delays are costly..

The Physics of the B Factories

LPH