A CMOS variable gain amplifier for PHENIX electromagnetic calorimeter and RICH energy measurements

Author

Wintenberg, A.L. ; Simpson, M.L. ; Young, G.R. ; Palmer, R.L. ; Moscone, C.G. ; Jackson, R.G.

Author_Institution

Oak Ridge Nat. Lab., TN, USA

Volume

44

Issue

3

fYear

1997

fDate

6/1/1997 12:00:00 AM

Firstpage

326

Lastpage

330

Abstract

A variable gain amplifier (VGA) has been developed for equalizing the gains of integrating amplifier channels used with multiple photomultiplier tubes operating from common high-voltage supplies. The PHENIX lead-scintillator electromagnetic calorimeter will operate in that manner, and gain equalization is needed to preserve the dynamic range of the analog memory and ADC following the integrating amplifier. The VGA is also needed for matching energy channel gains prior to forming analog sums for trigger purposes. The gain of the VGA is variable over a 3:1 range using a 5-bit digital control, and the risetime is held between 15 and 23 ns using switched compensation in the VGA. An additional feature is gated baseline restoration. Details of the design and results from several prototype devices fabricated in 1.2-μm Orbit CMOS are presented

Keywords

CMOS digital integrated circuits; calorimeters; detector circuits; nuclear electronics; pulse amplifiers; solid scintillation detectors; 1.2 mum; 5-bit digital control; ADC; CMOS variable gain amplifier; Orbit CMOS; PHENIX electromagnetic calorimeter; RICH; analog memory; energy measurements; gated baseline restoration; risetime; switched compensation; Detectors; Dynamic range; Electromagnetic measurements; Energy measurement; Extraterrestrial measurements; Gain measurement; Integrated circuit noise; Photomultipliers; Preamplifiers; Switches;

fLanguage

English

Journal_Title

Nuclear Science, IEEE Transactions on

Publisher

ieee

ISSN

0018-9499

Type

jour

DOI

10.1109/23.603664

Filename

603664