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This paper presents economical technical solutions for monolithic integrated semiconductor crosspoint arrays for PABXs. It starts with the description of IGFET switches and I/SUP 2/L-bipolar transistor switches. Then, realised symmetrical crosspoint arrays with these switches are treated, beginning with the integration level and the logic concept. Monolithic integrated crosspoint arrays with 5/spl times/2 balanced crosspoints in PMOS technology, NMOS Si-gate technology, and I/SUP 2/L technology are described in detail. Measurements for PMOS and I/SUP 2/L arrays show that for a one-stage PABX all transmission requirements at least are fulfilled. With an I/SUP 2/L-bipolar transistor array even switching networks with three stages are possible, since ON-resistances of these switches are especially low.
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Bachle et al. (1977) studied this question.
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