Patent ID: 6737958
Filing Date: 2004-05-18
Classification: H03K

Abstract:
A matrix type crosspoint switch circuit comprising:a plurality of input terminals; a plurality of output terminals; a plurality of input lines, each connected to a respective input terminal; a plurality of output lines, each connected to a respective output terminal; and a switch circuit provided at each intersection of an input line and an output line, each switch circuit comprising a switch cell connected to an input line and an output line, a control terminal for controlling the state of the switch cell, and a bias control circuit coupled to the switch cell, the switch circuits being arranged so that an input signal at any one of the input terminals may be routed to any one of the output terminals in accordance with a signal input to the control terminal; wherein the bias control circuit is configured to receive configuration information from an external controller and is responsive thereto to provide a control signal to the corresponding switch cell to enable the switch cell supplying a bias current thereto, or to disable the switch cell by supplying no bias current thereto, to reduce the static power dissipation of the switch cell.