Broadband signal switching apparatus

Abstract

A broadband signal cross point switching equipment comprises a cross point matrix having FET switch elements formed with a switching transistor and a holding circuit for providing a through-connect or inhibit signal. The matrix has input lines and output lines and the switching transistor includes a main electrode connected to the respective output line. The switch elements each comprise an auxiliary transistor forming a series circuit with the switching transistor and including a control electrode which is connected to the appertaining matrix input line and a main electrode, facing away from the series circuit, connected by way of a sampling transistor to one terminal of the operating voltage source, to whose other terminal the respective matrix output line is connected by way of a precharging transistor. The precharging transistor and the sampling transistor have their control electrodes charges opposite relative to one another with a switching matrix selection clock and subdivide a bit through connection time interval into a charging phase and an actual through-connect phase so that, given an inhibited sampling transistor, the matrix output line in each preliminary phase is at least approximately charged by way of the precharging transistor to the potential prevailing at the other terminal of the voltage source.