Method and Apparatus for Supplying Power to an Amplifier
There are disclosed various methods and apparatuses for providing power to a power amplifier. In some embodiments the method comprises producing a first reference signal having a level above a target signal, and producing a second reference signal having a level below the target signal. A positive supply voltage that tracks the first reference signal and a negative supply voltage that tracks the second reference signal are provided to a driver. A signal corresponding to the target signal is supplied from the driver to a power amplifier. In some embodiments the apparatus comprises means for implementing the method.
1 - 15 . (canceled)
16 . A method comprising:
producing a first reference signal having a level above a target signal;
producing a second reference signal having a level below the target signal;
providing a positive supply voltage that tracks the first reference signal to a driver;
providing a negative supply voltage that tracks the second reference signal to the driver; and
supplying a signal corresponding to the target signal to a power amplifier from the driver.
17 . The method according to claim 16 comprising:
generating the target signal on the basis of a signal to be transmitted.
18 . The method according to claim 16 comprising:
generating the positive supply voltage with a first switching converter; and
generating the negative supply voltage with a second switching converter.
19 . The method according to claim 18 comprising at least one of the following:
generating the positive supply voltage with a buck-boost type switching converter; and
generating the negative supply voltage with a boost type switching converter.
20 . The method according to claim 16 comprising:
time-widening the target signal; and
producing the first reference signal and the second reference signal on the basis of the time-widened target signal.
21 . An apparatus comprising:
a first element for producing a first reference signal having a level above a target signal;
a second element for producing a second reference signal having a level below the target signal;
a third element for providing a positive supply voltage that tracks the first reference signal to a driver;
a fourth element for providing a negative supply voltage that tracks the second reference signal to the driver;
wherein the driver comprises an output for supplying a signal corresponding to the target signal to a power amplifier.
22 . The apparatus according to claim 21 , wherein the apparatus is adapted to:
generate the target signal on the basis of a signal to be transmitted.
23 . The apparatus according to claim 21 further comprising:
a third element comprises a first switching converter; and
a fourth element comprises a second switching converter.
24 . The apparatus according to claim 23 , wherein:
the first switching converter is a buck-boost type switching converter; and
the second switching converter is a boost type switching converter.
25 . The apparatus according to claim 21 further comprising:
an input for receiving an offset signal;
wherein the first element is adapted to produce the first reference signal on the basis of the offset signal and the target signal; and
the second element is adapted to produce the second reference signal on the basis of the offset signal and the target signal.
26 . The apparatus according to claim 25 further comprising:
a digital to analog converter for producing the offset signal.
27 . The apparatus according to claim 21 further comprising:
a fifth element for time-widening the target signal;
wherein the apparatus is adapted to produce the first reference signal and the second reference signal on the basis of the time-widened target signal.
28 . A computer program product including one or more sequences of one or more instructions which, when executed by one or more processors, cause an apparatus to at least perform the following:
produce a first reference signal having a level above a target signal; and
produce a second reference signal having a level below the target signal;
wherein the apparatus is adapted to:
provide a positive supply voltage that tracks the first reference signal to a driver;
provide a negative supply voltage that tracks the second reference signal to the driver; and
supply a signal corresponding to the target signal to a power amplifier from the driver.
29 . The computer program product according to claim 28 , the computer program product including one or more sequences of one or more instructions which, when executed by one or more processors, cause the apparatus to at least perform the following:
generate the target signal on the basis of a signal to be transmitted.
30 . The computer program product according to claim 28 , the computer program product including one or more sequences of one or more instructions which, when executed by one or more processors, cause the apparatus to at least perform the following:
generate the positive supply voltage with a first switching converter; and
generate the negative supply voltage with a second switching converter.
31 . The computer program product according to claim 30 , the computer program product including one or more sequences of one or more instructions which, when executed by one or more processors, cause the apparatus to at least perform the following:
generate the positive supply voltage with a buck-boost type switching converter.
32 . The computer program product according to claim 30 , the computer program product including one or more sequences of one or more instructions which, when executed by one or more processors, cause the apparatus to at least perform the following:
generate the negative supply voltage with a boost type switching converter.
33 . The computer program product according to claim 28 , the computer program product including one or more sequences of one or more instructions which, when executed by one or more processors, cause the apparatus to at least perform the following:
time-widen the target signal; and
produce the first reference signal and the second reference signal on the basis of the time-widened target signal.