Patent ID: 6717484
Filing Date: 2004-04-06
Classification: H03J,H03L,H04B

Abstract:
A VCO (voltage controlled oscillator) circuit for connection and operation in a phase locked loop arrangement, the VCO circuit having a plurality of operational states in each of which the VCO circuit is operable to provide activation of a selected one of a plurality of different associated phase locked loops when connected to the VCO circuit, the VCO circuit including switching means for switching the state of the VCO circuit to allow the operational state of the VCO circuit to be selected, wherein the switching means comprises a plurality of electrical switches, each of the switches being connected to an associated part of the VCO circuit, whereby the operational state of the VCO circuit and the state of each associated phase locked loop is selectable, each phase locked loop in operation being activated or deactivated by closing of its associated switch in the VCO circuit.