Patent ID: 8229379

Claim:
A multi-band receiver, comprising: receiver circuitry configured to operate in a plurality of selectable frequency bands and coupled to receive a supply voltage, the selectable frequency bands comprising at least a first frequency band and a second frequency band each including multiple channels; a DC-DC (direct-current-to-direct-current) regulator system, comprising: first DC-DC regulator circuitry having a first switching clock input signal at a first switching clock rate and configured to provide a first voltage supply output signal for the supply voltage; and second DC-DC regulator circuitry having a second switching clock input signal at a second switching clock rate different from the first switching clock rate and configured to provide a second voltage supply output signal for the supply voltage, the second voltage supply output signal having a voltage level different from a voltage level for the first voltage supply output signal; wherein the first DC-DC regulator circuitry is used when the receiver circuitry is operating in the first frequency band and the second DC-DC regulator circuitry is used when the receiver circuitry is operating in the second frequency band; wherein the first voltage supply output signal from the first DC-DC regulator circuitry and the second voltage supply output signal from the second DC-DC regulator circuitry are coupled to a common node to provide the supply voltage to the receiver circuitry; and wherein the first DC-DC regulator circuitry is configured to output a first supply voltage level when the receiver circuitry is operating in the first frequency band and to output a second supply voltage level when the receiver circuitry is operating in the second frequency band, such that the first supply voltage level is lower than an output voltage level provided by the second DC-DC regulator circuitry and the second supply voltage level is higher than the output voltage level provided by the second DC-DC-regulator circuitry.