公开(公告)号：EP1709731A1

公开(公告)日：2006-10-11

申请号：EP05708139.0

申请日：2005-01-28

Applicant: Nokia Corporation

Inventor： KOUKKARI, Eero ,  OILINKI, Tero ,  KURTTIO, Pasi

IPC: H03F1/32

CPC classification number: H03F1/3282 ,  H03F1/3247 ,  H03F2200/102

Abstract: The invention relates to an electronic circuit for adjusting at least one property of an input signal of a non-linear element. A detector detects a strength of the input signal. An analog controller forms at least one control signal as a piecewise approximation of a non-linear dependency between the at least one property and the strength of the input signal detected by the detector. An adjusting circuit adjusts the at least one property of the input signal according to the at least one control signal from at least one controller.

Abstract translation: 本发明涉及用于调整非线性元件的输入信号的至少一个特性的电子电路。 检测器检测输入信号的强度。 模拟控制器形成至少一个控制信号，作为由检测器检测的输入信号的至少一个属性和强度之间的非线性相关性的分段近似。 调整电路根据来自至少一个控制器的至少一个控制信号来调整输入信号的至少一个属性。

公开(公告)号：EP1704640A1

公开(公告)日：2006-09-27

申请号：EP05711536.2

申请日：2005-01-14

Applicant: Qualcomm, Incorporated

Inventor： RAGHUPATHY, Arun ,  SEE, Puay Hoe ,  SAHOTA, Gurkanwal Kamal ,  REEVES, Robert ,  PETERZELL, Paul, E.

IPC: H03F1/32 ,  H03G3/30

CPC classification number: H03F1/3247 ,  H03F1/0222 ,  H03F1/3282 ,  H03F2201/3233 ,  H03G3/3047

Abstract: Methods and apparatus for amplifier AM and PM predistortion and autocalibration. AM and PM amplifier distortion can be corrected using predistortion. The AM and PM distortion characteristics of the amplifier are determined using an autocalibration technique. The amplifier characteristics can be stored in distinct look up tables (526, 712). Alternatively, the inverse of the amplifier characteristics can be stored in distinct look up tables. Signals that are to be amplified are characterized in polar format having a phase component with a normalized magnitude and a magnitude component. The phase component can be predistorted by applying the inverse of the PM distortion characteristics to the signal. Similarly, the magnitude component can be predistorted by applying the inverse of the AM distortion characteristics to the signal. The predistorted phase component can be amplified using the previously characterized amplifier. The predistorted magnitude component can be used to set the gain of the previously characterized amplifier.

公开(公告)号：EP1691518A2

公开(公告)日：2006-08-16

申请号：EP06000297.9

申请日：2006-01-09

Applicant: Infineon Technologies AG

Inventor： Li Puma, Giuseppe

IPC: H04L27/36

CPC classification number: H04L27/368 ,  H03F1/3241 ,  H03F1/3282 ,  H03F3/24 ,  H03F2200/331 ,  H04L27/361 ,  H04L27/362

Abstract: Die Sende-/Empfangseinrichtung umfasst einen Polar-Modulator mit einstellbarem Vorverzerrer (11, 12) und modulierbarem Verstärker (8), einen Empfangspfad (25), welcher sowohl beim gewöhnlichen Empfangsbetrieb als auch im Rahmen der Einstellung des Vorverzerrers (11, 12) zur Ermittlung eines von dem Ausgangssignal des Verstärkers (8) abhängigen Mess-Signals (35) betreibbar ist, sowie einen Koppelpfad zur Verkoppelung des Empfangspfads (25) mit dem Ausgang des Verstärkers (8). Außerdem ist ein Steuer- und Auswertemittel (34, 36) zur Einstellung des Vorverzerrers (11, 12) vorgesehen.

Abstract translation: 极化调制器具有在信号方向上连接放大器上游的幅度和相位预失真器（11,12），用于由放大器和可变预失真引起的失真的部分补偿。 接收路径用于接收无线电信号并用于调整预失真器以根据通过耦合路径从放大器接收的输出信号来确定测量信号。 预失真器由控制和评估单元根据测量信号进行调整。 预失真调整方法还包括独立的索赔。

公开(公告)号：EP1142104B1

公开(公告)日：2005-08-17

申请号：EP98965872.9

申请日：1998-12-24

Applicant: Nokia Corporation

Inventor： POSTI, Harri

IPC: H03F1/32 ,  H04B1/62 ,  H04B1/04 ,  H04L5/06

CPC classification number: H04L27/368 ,  H03F1/3247 ,  H03F1/3282 ,  H03F2201/3206 ,  H03F2201/3233 ,  H04B1/04 ,  H04B1/62

Abstract: A multi-frequency carrier transmitter (102) comprises input means for receiving a plurality of different digital signals to be transmitted. The different signals are to be transmitted on different carrier frequencies. Amplifier means (122) receive a composite signal comprising the different signals at the respective carrier frequencies and amplify the composite signal. Predistortion means (108) predistort the plurality of digital signals prior to amplification of the composite signal by the amplification means. The predistortion provided by the predistortion means is subsequently altered in dependence on the difference between the input signals and the output at the amplifier means.

公开(公告)号：EP1071204B1

公开(公告)日：2005-05-04

申请号：EP00115475.6

申请日：2000-07-18

Applicant: Sharp Kabushiki Kaisha

Inventor： Sakuno, Keiichi

IPC: H03F1/02 ,  H03F1/32

CPC classification number: H03F1/0261 ,  H03F1/3282 ,  H03F1/565 ,  H03F2200/18 ,  H03F2200/372

公开(公告)号：EP1405480B1

公开(公告)日：2005-04-27

申请号：EP02762342.0

申请日：2002-07-10

Applicant: Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V.

Inventor： PERTHOLD, Rainer ,  GERHÄUSER, Heinz

IPC: H04L27/36 ,  H03F1/32

CPC classification number: H03F1/3282 ,  H03F1/3241

公开(公告)号：EP1157457A4

公开(公告)日：2005-04-27

申请号：EP00913325

申请日：2000-02-01

Applicant: FUJANT INC

Inventor： KOLANEK JAMES C ,  SHYNK JOHN J ,  BASEGHI BEHSHAD

IPC: H03F3/68 ,  H03F1/02 ,  H03F1/32 ,  H03F3/21 ,  H03F3/60 ,  H03F3/72 ,  H04B1/04 ,  H04B3/04 ,  H03F1/26

CPC classification number: H03F1/3282 ,  H03F1/0277 ,  H03F1/0294 ,  H03F1/3247 ,  H03F1/3252 ,  H03F1/3288 ,  H03F3/211 ,  H03F3/602 ,  H03F3/72 ,  H03F2200/102 ,  H03F2201/3233 ,  H03F2203/7215 ,  H03F2203/7236 ,  H04B1/0483

Abstract: A calibration method and apparatus for calibrating and linearizing an amplifier (1021-n) in which an input signal (Vin) is decomposed into N channels (x1(n)). Then the amplifier is modeled to generate an estimated transfer function for each channel. Using the estimated transfer function for each channel, equalizer values are computed for equalizers that are applied to each channel prior to amplification, thus enabling the amplification of amplitude and/or phase modulated signals via the non-linear amplifiers.

公开(公告)号：EP1111868A3

公开(公告)日：2003-12-17

申请号：EP00311516.9

申请日：2000-12-21

Applicant: NORTEL NETWORKS CORPORATION

Inventor： Dolman, Graham

IPC: H04L27/36 ,  H03F1/32

CPC classification number: H04L27/368 ,  H03F1/3247 ,  H03F1/3282 ,  H03F2200/102

Abstract: This invention relates to a phase and amplitude detector (160) required to identify small signal errors in a signal envelope having a large dynamic range, especially in the context of linearization of a power amplifier (122) arrangement employing a pre-distortion technique. A vector generator (300, 352, 372) responsive to a reference signal R (110) produces a frame of reference vectors R 1 - R n (274-280) generated by a combination of the reference signal R (110) with first A (270) and second P (272) offset vectors that provide an amplitude and phase displacement of the reference signal R (110). A signal combiner (290-296, 360-366, 390-396) is arranged to generate difference vectors E 1 - E n by combining the frame of reference vectors R 1 - R n (274-280) and the feedback signal F (124, 150), with the difference vectors E 1 - E n expressing the phase (p, 254) and the gain (a, 252) error terms relative to the reference signal R (110) and the first A (270) and second P (272) offset vectors. An error signal detector, (330-336) responsive to the difference vectors E 1 - E n and arranged to provide a measure of the phase (p, 254) and the gain (a, 252) error terms, provides signal amplitudes that can be combined to generate error signals (182 (Y), 184 X)). The error signals take the general form:X = P1 - P2 - P3 + P4 = -8PpR;Y = P1 + P2 - P3 - P4 = -8AaR

公开(公告)号：EP1065856A3

公开(公告)日：2003-09-03

申请号：EP00830422.2

申请日：2000-06-15

Applicant: Itelco - S.p.A.

Inventor： Andreoli, Sante ,  Banelli, Paolo

IPC: H04L27/36 ,  H04L25/03 ,  H03F3/32 ,  H04B1/04 ,  H03F1/32

CPC classification number: H03F1/3282 ,  H03F1/3241 ,  H03F1/3247 ,  H03F1/3294 ,  H03F2200/102 ,  H03F2200/336 ,  H03F2200/438 ,  H03F2200/57 ,  H03F2200/66 ,  H03F2201/3233 ,  H04B2001/0425 ,  H04L27/361 ,  H04L27/368

Abstract: The present invention concerns a predistortion system for amplifier linearisation characterised by the fact that it comprises a predistortion circuit in cascade to a clipping circuit composed of at least one clipping device followed by at least one post-clipping filter device.

公开(公告)号：EP1225690A3

公开(公告)日：2003-07-02

申请号：EP01310612.5

申请日：2001-12-19

Applicant: Nokia Corporation

Inventor： Midtgaard, Jacob ,  Bagger, Oluf

IPC: H03F1/32 ,  H03F1/02

CPC classification number: H03F1/3282 ,  H03F1/0227 ,  H03F1/3247 ,  H03F2200/102 ,  H03F2201/3233

Abstract: A polar loop transmitter includes separate phase and envelope paths providing a linearising scheme for an efficient non-linear power amplifier. Loop filters are included in each of the phase and envelope paths to enable the path characteristics to be matched to one another. A polar loop transmitter and other types of envelope elimination and restoration transmitters control the output envelope of the power amplifier by connecting the output of the envelope detector, or in an envelope feedback transmitter, the envelope error signal, to the bias control input of the power amplifier. The transmitter can further include compensation means for compensating for non-linearities in the envelope control means and a loss of feedback control detector to ensure that the feedback signal remains within acceptable limits.