IP Library › Granted Patent US 6,897,722
Granted Patent B2
US 6,897,722 · App. 10/793,811 · Granted May 24, 2005

Adaptive linearizer for RF power amplifiers

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Quick Facts
Patent No.
US 6,897,722
App. No.
10/793,811
Granted
May 24, 2005
Kind
B2
Abstract

A feedforward amplifier is disclosed in which either the main amplifier or the auxiliary amplifier includes at least three parallel signal paths. Each of the signal paths includes a complex gain adjuster. In addition, a feedforward amplifier is disclosed in which a plurality of control linearizers compensate for nonlinearities in the response of signal adjusters to control inputs.

Claims (13)

1. A method comprising the steps of:

inputting an input signal to a signal complex gain adjusting circuit of a feedforward linearizer;

generating via a control linearizer a control signal from an input signal to the control linearizer; and

adjusting the input signal using the control signal, wherein the overall response of the signal complex gain adjusting circuit to the control signal is substantially linear.

2. A method according to claim 1 , wherein the control linearizer is implemented using a digital signal processor, and software running on the digital signal processor generates the control signal.

3. A method according to claim 1 , wherein the transfer function of the control linearizer is substantially the inverse of the transfer function of the signal complex gain adjusting circuit.

4. A method according to claim 1 , wherein the voltage of the control signal is the square root of the voltage of the control linearizer input signal.

5. A method according to claim 1 , wherein the input signal to the signal complex gain adjusting circuit is an RF signal, and the signal complex gain adjusting circuit is part of a signal cancellation circuit of the feedforward linearizer.

6. A method according to claim 1 , wherein the input signal to the signal complex gain adjusting circuit is an error signal, and the signal complex gain adjusting circuit is part of a distortion cancellation circuit of the feedforward amplifier.

7. A method according to claim 1 , wherein the input signal to the signal complex gain adjusting circuit is an RF signal and the control linearizer input signal is an error signal.

8. A method according to claim 1 , wherein the input signal to the signal complex gain adjusting circuit is an error signal and the control linearizer input signal is an output signal of the feedforward amplifier.

9. A method according to claim 1 , wherein the control signal is generated using a lookup table.

10. A method according to claim 1 , wherein the control signal is generated by direct computation.

Assignments (12)
RELEASE OF SECURITY INTEREST Recorded Apr 9, 2019
From: JPMORGAN CHASE BANK, N.A.
To: REDWOOD SYSTEMS, INC.; ALLEN TELECOM LLC; ANDREW LLC; COMMSCOPE, INC. OF NORTH CAROLINA; COMMSCOPE TECHNOLOGIES LLC
Reel/Frame 048840/0001 →
RELEASE OF SECURITY INTEREST Recorded Apr 9, 2019
From: JPMORGAN CHASE BANK, N.A.
To: REDWOOD SYSTEMS, INC.; ALLEN TELECOM LLC; ANDREW LLC; COMMSCOPE, INC. OF NORTH CAROLINA; COMMSCOPE TECHNOLOGIES LLC
Reel/Frame 049260/0001 →
RELEASE OF SECURITY INTEREST PATENTS (RELEASES RF 036201/0283) Recorded Mar 31, 2017
From: WILMINGTON TRUST, NATIONAL ASSOCIATION
To: ALLEN TELECOM LLC; COMMSCOPE TECHNOLOGIES LLC; COMMSCOPE, INC. OF NORTH CAROLINA; REDWOOD SYSTEMS, INC.
Reel/Frame 042126/0434 →
SECURITY INTEREST Recorded Jul 28, 2015
From: ALLEN TELECOM LLC; COMMSCOPE TECHNOLOGIES LLC; COMMSCOPE, INC. OF NORTH CAROLINA; REDWOOD SYSTEMS, INC.
To: WILMINGTON TRUST, NATIONAL ASSOCIATION, AS COLLATERAL AGENT
Reel/Frame 036201/0283 →
CHANGE OF NAME Recorded Mar 25, 2015
From: ANDREW LLC
To: COMMSCOPE TECHNOLOGIES LLC
Reel/Frame 035283/0849 →
CHANGE OF NAME Recorded Mar 19, 2015
From: ANDREW CORPORATION
To: ANDREW LLC
Reel/Frame 035229/0118 →
SECURITY AGREEMENT Recorded May 4, 2011
From: ALLEN TELECOM LLC, A DELAWARE LLC; ANDREW LLC, A DELAWARE LLC; COMMSCOPE, INC OF NORTH CAROLINA, A NORTH CAROLINA CORPORATION
To: JPMORGAN CHASE BANK, N.A., AS COLLATERAL AGENT
Reel/Frame 026272/0543 →
SECURITY AGREEMENT Recorded May 3, 2011
From: ALLEN TELECOM LLC, A DELAWARE LLC; ANDREW LLC, A DELAWARE LLC; COMMSCOPE, INC. OF NORTH CAROLINA, A NORTH CAROLINA CORPORATION
To: JPMORGAN CHASE BANK, N.A., AS COLLATERAL AGENT
Reel/Frame 026276/0363 →
PATENT RELEASE Recorded Feb 3, 2011
From: BANK OF AMERICA, N.A., AS ADMINISTRATIVE AGENT
To: COMMSCOPE, INC. OF NORTH CAROLINA; ALLEN TELECOM LLC; ANDREW LLC (F/K/A ANDREW CORPORATION)
Reel/Frame 026039/0005 →
SECURITY AGREEMENT Recorded Jan 9, 2008
From: COMMSCOPE, INC. OF NORTH CAROLINA; ALLEN TELECOM, LLC; ANDREW CORPORATION
To: BANK OF AMERICA, N.A., AS ADMINISTRATIVE AGENT
Reel/Frame 020362/0241 →
ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded Dec 17, 2004
From: BTG INTERNATIONAL INC.
To: ANDREW CORPORATION
Reel/Frame 015469/0573 →
ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded Dec 13, 2004
From: SIMON FRASER UNIVERSITY
To: BTG INTERNATIONAL INC.
Reel/Frame 015452/0159 →