Broadband signal space switching apparatus

Claim 1

In a broadband signal space switching apparatus of the type comprising a plurality of row selection lines, a plurality of common selection lines intersecting said row selection lines, a plurality of signal input lines, a plurality of signal output lines intersecting said signal input lines and forming crosspoint locations, and in which each of said crosspoint locations comprises a n-channel field effect transistor switch including a source-drain path connected to the respective input and output lines, and a gate, and in which a respective memory cell is provided at each crosspoint and connected to a corresponding row selection line and a corresponding column selection line, and in which a row selection decoder is connected to said row selection lines and a column decoder is connected to said column selection lines, and in which each memory cell comprises an n-channel transistor including a source-drain path connected to the respective column selection line and a gate connected to the respective row selection line and a pair of cross-coupled inverter circuits each including an input and an output, the improvement wherein: the input of only one of said inverter circuits is connected to said source-drain path of said n-channel transistor; and a resistor connects said output of only one inverter circuit to said gate of said n-channel field effect transistor switch.