Power Management

1 . A system comprising:

a power supply system, the power supply system having at least two operating ranges;

a power management system configured to control which operating range is being used by the power supply system;

at least one module, the module configured to communicate to the power management system a variable parameter indicating power usage by the module; and

the power management system configured to change the operating range of the power supply system in response to the communication from the module.

2 . The system of claim 1 , further comprising:

a weighting factor, where the variable parameter is multiplied by the weighting factor before being communicated to the power management system.

3 . The system of claim 2 , further comprising:

the power management system configured to change the operating range of the power supply system in response to a weighted sum of variable parameters.

4 . The system of claim 2 , further comprising:

the module configured to modify the weighting factor.

5 . The system of claim 1 , further comprising:

the variable parameter comprising a binary status indicating one of active and inactive.

6 . The system of claim 1 , further comprising:

the variable parameter comprising a weighting factor.

7 . The system of claim 1 , further comprising:

the variable parameter indicating the relative power requirements of the module.

8 . The system of claim 1 , further comprising:

the variable parameter indicating clock frequency used by the module.

9 . The system of claim 8 , further comprising:

the parameter indicating clock frequency being sent by a clock module.

10 . The system of claim 1 , further comprising:

the variable parameter comprising an identification of module type.

11 . The system of claim 1 , further comprising:

the power management system configured to modify a bias current in a power supply in the power supply system.

12 . The system of claim 1 , further comprising:

the power management system configured to select one of a plurality of power supplies in the power supply system.

13 . The system of claim 1 , further comprising:

the power management system configured to select a number of parallel transistors in a power supply in the power supply system.

14 . The system of claim 1 , further comprising:

the power management system configured to select a number of parallel power supplies in the power supply system.

15 . A system comprising:

a power supply system;

a power management system configured to select at least one operating range of the power supply system;

at least one module receiving a clock signal, the module configured to communicate to the power management system a variable parameter determined by the clock signal; and

the power management system configured to change the operating range of the power supply system in response to the communication from the module.

16 . A method, comprising:

sending, by a module, information indicating power usage by the module;

receiving, by a power management system, the information from the module; and

modifying, by the power management system, an operating range of a power supply system based on the information from the module.

17 . The method of claim 16 , the step of modifying further comprising:

modifying a bias current in a power supply in the power supply system.

18 . The method of claim 16 , the step of modifying further comprising:

selecting one of a plurality of power supplies in the power supply system.

19 . The method of claim 16 , the step of modifying further comprising:

selecting a number of parallel transistors in a power supply in the power supply system.

20 . The method of claim 16 , the step of modifying further comprising:

selecting a number of parallel power supplies in the power supply system.