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Multiplexer-related

Waste-energy-control-and-management-in-power-amplifier

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Waste energy control and management in power amplifier

Details

Inventors: Dent, Paul W.; Lampe, Ross W.;
Assignee: Ericsson GE Mobile Communications Inc. (Research Triangle Park, NC)
Primary Examiner: Mullins; James B.
Assistant Examiner:
Attorney, Agent or Firm: Burns, Doane, Swecker & Mathis, L.L.P.

An amplifying apparatus for linearly amplifying a desired signal using a pair of coupled non-linear amplifiers is disclosed. The amplifying apparatus comprises a limiter for separating amplitude variations from the desired signal and producing a constant amplitude signal bearing the phase of the desired signal and an amplitude related signal. In addition, a drive signal generater produces two drive signals each dependent on the constant amplitude signal and the amplitude related signal such that each drive signal depends on the phase of the desired signal and such that the sum of the squares of the amplitudes of the drive signals is constant. Finally, a coupler couples the two drive signals to produce two constant amplitude signals for driving the pair of non-linear power amplifiers and for coupling the outputs of the power amplifiers to produce two amplified output signals, one of which is the linearly amplified desired signal and the other of which is a waste energy signal.

DETAILED DESCRIPTION OF THE DRAWINGS These and other features and advantages of the invention will be readily apparent to one of ordinary skill in the art from the following description, used in conjunction with the drawings, in which: FIGS.
1(a) and 1(b) illustrate a conventional power amplifier coupling to an antenna; FIG.
2 illustrates a conventional quadrature coupled amplifier; FIG.
3 illustrates a conventional feed forward linearization amplifier attached to an antenna; FIG.
4 illustrates an over-dimensioned matrix power amplifier according to one embodiment of the present invention; FIG.
5 illustrates a Class C linear power amplifier according to one embodiment of the present invention; FIG.
6 illustrates an N channel matrix power amplifier using two N Class C amplifiers according to one embodiment of the present invention; FIG.
7 illustrates a general Class C matrix power amplifier according to one embodiment of the present invention; FIG.
8 illustrates a signal generator for producing phase modulated drive signals according to one embodiment of the present invention; FIG.
9 illustrates a cylindrical array of slot antennas and a phase or a base station; FIG.
10 illustrates a transmit array processor according to one embodiment of the present invention; FIG.
11 illustrates a block diagram of a heat reduction method according to one embodiment of the present invention; FIG.
12 illustrates a block diagram of the recovery of reflected power according to one embodiment of the present invention; FIG.
13 illustrates a graph showing the effective transmitter efficiency versus the antenna mismatch with and without one embodiment of the present invention; FIG.
14 illustrates in a graph the increase in talk time using one embodiment of the present invention to recycle waste energy; FIG.
15 illustrates the recovery of waste energy in hybrid coupled amplifiers according to one embodiment of the present invention; FIG.
16 illustrates a feed forward amplifier with a improved efficiency according to one embodiment of the present invention; FIG

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