Eduard Atkin, Sergey Kondratenko, Yury Mishin, Anatoly Pleshko, Yury Volkov
Moscow Engineering Physics Institute,

Abram Goldsher
Research Institute "Pulsar",

Vladimir Chernikov
Research Institute "Pulse Technique"

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        The paper considers finished 16-channel printed circuit units (PCUs), 
intended to read out and process preliminary the signals of multi-wire chambers.
The given units are a development of the PCUs presented at the 3-rd and 4-th 
Workshops [1,2]. 
	Their characteristics reflect the trends in reducing unit dimensions 
at channel number increasing.
	The PCUs are built with 8-channel ICs of amplifier-shapers and 
discriminators. These ICs are implemented with the earlier designed 
semicustom array, made application specific for physical experiments and 
described in the proceedings of the 3-rd Workshop. The semicustom array was 
manufactured by an npn bipolar technology with unity-gain frequencies above 
6 GHz (at 1 mA). 
The schematic diagrams and basic characteristics of these ICs are presented. 
Their standard input dynamic range makes up 5..200 uA. The discriminator 
(high-speed comparator) outputs provide a quasidifferential output in the GTL 
standard.
	The considered units are implemented with 4-layer PCBs measuring 
90*40 mm.sq. ICs and other components are mounted by surface mount technology. 
The unit is connected with the detector by four 10-pin FPC connectors 
Harwin F10. At the unit`s output a 40-pin Hirose connector with a pitch of 
1.27 mm is used.
	Two modifications of the PCU (lower one UP25411L and upper one 
UP25411U), capable to be joined in a bookstand manner, forming a 32-channel 
unit, have been manufactured. The mount density increases thereat up to the 
value of 1 front-end channel per 1 cm.cub.
	The basic electrical characteristics of UP25411U/L are presented below. 
Transresistance, kOhm                           25
Input resistance, Ohm                           330 
Shaper output rise time, ns                     10
Output pulse duration at base level, ns         50
Shaper output full swing, V                     2,5 
Range of comparator threshold setting, mV       10..2000
Comparator rise time at C load = 5pF, ns        3
Comparator fall time at C load = 5pF, ns        5
Comparator propagation delay, ns                8 
Power consumption per channel, mW               40 
Supply voltage, V                               +-3 
	The features of the PCUs are first of all the large maximal output 
amplitude of the amplifier-shaper (not less than 2.5 V), allowing to use the 
amplifier-comparator channel not only for timing signal generation, but also 
to store and process amplitude information. Moreover, at a standard dynamic 
range of 100 (from noise and up to the maximal amplitude) this allows operation 
with higher comparator thresholds and thereby reduce problems with pick-up and 
cross-talk in a multichannel system. The general view of the PCUs is presented. 
At present a new modification of the ICs is prepared, having a greater input 
sensitivity (gain of preamp).
1. E.Atkin , Yu.Volkov, I. Ilyushchenko, S.Kondratenko, Yu. Mishin, P.Khlopkov, 
V.Chernikov, V.Subbotin, S.Tsvetkov,- Eight-channel PCBs for wire tracking 
detectors. Proceeding of the Third Workshop on Electronics, for LHC 
Experiments, London,  September 22-26, CERN/LHCC/97-60, 21 October 1997, 
p.463-465.
2. E.Atkin, Yu.Volkov, S.Kondratenko, Yu.Mishin, A.Pleshko, 16-channel PCUs 
for processing signals of multiwire chambers. A functionally oriented 
semicustom array. Proceedings of the Fourth Workshop on Electronics for LHC 
Experiments, Rome, September 21-25, 1998, CERN/LHCC/98-36, 30 October 1998, 
p.555-559.

!!
	The paper considers finished 16-channel printed circuit units (PCUs), 
intended to read out and process preliminary the signals of multiwire chambers. 
Their characteristics reflect the trends in mount density increase (up to  
1 front-end channel per 1 cm.cub.).
The PCUs are built with 8-channel ICs of amplifier-shapers and discriminators 
based on application specific semicustom array. 
The considered units are implemented with 4-layer PCBs measuring 90*40 mm.sq, 
which may be combined into a 32-channel unit. ICs and other components are 
mounted by surface mount technology. 
	The basic electrical characteristics of  PCUs and ICs are presented.
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