Patent ID: 6996389

Claim:
A power supply for a communication apparatus, comprising: a source of a first control signal that is indicative when a first antenna signal is to be selected and when a second antenna signal is to be selected; a power transistor responsive to said first control signal for generating an output supply voltage at a value selected, in accordance with said first control signal, said output supply voltage being coupled to a stage of said communication apparatus to select said first antenna signal, when a first value of said output supply voltage is generated and said second antenna signal, when a second value of said output supply voltage is generated; a switch responsive to said first control signal and coupled to an input of said power transistor for selecting, in a first switching state of said switch, a first input supply voltage to be developed at said input, when said first antenna signal is selected, and, in a second switching state of said switch, a second input supply voltage to be developed at said input, when said second antenna signal is selected; and a fault detector coupled to said switch for changing the switching state in said switch, when said second antenna signal is selected and a fault condition occurs, to select an input supply voltage to be developed at said input that is different from said second input supply voltage.