An Integrated Amplifier and Sample-and-Hold Analog Multiplexer Module

Abstract

The integrated amplifier and sample-and-hold analog multiplexer-ISHAM, is a proportional wire chamber analog readout module. It includes the front-end am plifier, the gated integrator and the sample-and-hold analog multiplexer. A density of 24 channels per module was achieved in a nonstandard multilayer P.C. board. Besides the above mentioned functions, the module provides: the control circuits for the Read-In and the Read-Out of the wire signals, the control circuits for the calibration of the 24 amplifiers, and the neutral trigger information. As an additional feature, the high voltage required by each wire is also supplied. The gain is 5V output voltage @ 20 pC input signal charge. The equivalent input noise charge is 4 × 10-15 C for the channel only and 6 × 10-15 for the entire system. The nonlinearity is better than 0.1% f.s. and the crosstalk is less than 1%. The Z-position resolution achieved is 1%.