Waste energy control and management in power amplifiers

• US 5,732,325 A
• Filed: 06/07/1995
• Issued: 03/24/1998
• Est. Priority Date: 01/11/1994
• Status: Expired due to Term

• Current Assignee: Ericsson, Inc. (Telefonaktiebolaget LM Ericsson), Telefonaktiebolaget LM Ericsson
• Original Assignee: Ericsson, Inc. (Telefonaktiebolaget LM Ericsson)
• Inventors: Lampe, Ross Warren, Dent, Paul W.
• Primary Examiner(s): Eisenzopf, Reinhard J.
• Assistant Examiner(s): VO, NGUYEN THANH
• Application Number:
  US08/475,302
• Time in Patent Office: 1,021 Days
• Field of Search: 455/12.1, 455/127, 455/343, 455/11.1, 455/13.3, 455/13.4, 455/129, 455/49.1, 455/41, 455/19, 455/25, 455/33.1, 455/54.1, 342/372, 342/373, 343/853, 343/DIG. 2, 343/700 MS, 330/124 R, 330/10, 330/84, 330/151, 330/295, 330/149, 330/136, 330/297, 330/202
• US Class Current: 455/13.3
• CPC Class Codes: H03F 1/0294 using vector summing of two or more constant amplitude phase-modulated signals
• CPC Class Codes: H03F 1/3229 using a loop for error extraction and another loop for error subtraction
• CPC Class Codes: H03F 1/3252 using multiple parallel paths between input and output H03F1/3258, H03F1/3282, H03F1/3294 take precedence
• CPC Class Codes: H03F 1/34 Negative-feedback-circuit arrangements with or without positive feedback H03F1/02 - H03F1/30, H03F1/38 - H03F1/50, H03F3/50 take precedence ; for rejection of common mode signals H03F3/45479
• CPC Class Codes: H03F 3/24 of transmitter output stages
• CPC Class Codes: H03F 3/602 Combinations of several amplifiers
• CPC Class Codes: H04B 1/04 Circuits
• CPC Class Codes: H04B 1/0483 Transmitters with multiple parallel paths
• CPC Class Codes: H04B 1/1607 Supply circuits converters H02M; filters therefor H02M1/14; voltage stabilisers G05F1/46
• CPC Class Codes: H04B 1/52 Hybrid arrangements, i.e. arrangements for transition from single-path two-direction transmission to single-direction transmission on each of two paths or vice versa
• CPC Class Codes: H04B 2001/0433 with linearisation using feedback

Abstract

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 generator 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 wherein the desired signal and the waste energy signal are transmitted by an antenna in different directions.

Claims

1. A system for communicating using a first station with a first plurality of second stations using a phased array antenna comprising:

signal generation means for generating a first plurality of signals for transmission to respective second stations using radio-wave modulation;

signal processing means for processing said first plurality of signals to produce a second plurality of constant amplitude drive signals;

amplifying apparatus for amplifying said second plurality of drive signals using transmit power amplifiers adapted efficiently to transmit constant amplitude signals; and

antenna means connected to said amplifying apparatus for radiating said power amplified signals such that wanted signals are radiated in desired directions and unwanted signals are dissipated in other directions.

2. A system according to claim 1, wherein said first station is an orbiting satellite.

3. A system according to claim 1, wherein said second stations are mobile or portable wireless telephones.

4. A system according to claim 1, wherein said radio-wave modulation is selected from the group comprising speech coding, error-correction coding, error-detection coding, and digital modulation.