WO2002078176A3 - Digital baseband receiver in a multi-carrier power amplifier - Google Patents

Digital baseband receiver in a multi-carrier power amplifier Download PDF

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Publication number
WO2002078176A3
WO2002078176A3 PCT/US2002/006970 US0206970W WO02078176A3 WO 2002078176 A3 WO2002078176 A3 WO 2002078176A3 US 0206970 W US0206970 W US 0206970W WO 02078176 A3 WO02078176 A3 WO 02078176A3
Authority
WO
WIPO (PCT)
Prior art keywords
imd
power amplifier
locations
carrier
carrier frequencies
Prior art date
Application number
PCT/US2002/006970
Other languages
French (fr)
Other versions
WO2002078176A2 (en
Inventor
Paul E White
Thomas A Bachman
Robert W Kooker
Leonard Sarver
Robert Snyder
Paul Everline
Original Assignee
Andrew Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Andrew Corp filed Critical Andrew Corp
Publication of WO2002078176A2 publication Critical patent/WO2002078176A2/en
Publication of WO2002078176A3 publication Critical patent/WO2002078176A3/en

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F1/00—Details of amplifiers with only discharge tubes, only semiconductor devices or only unspecified devices as amplifying elements
    • H03F1/32—Modifications of amplifiers to reduce non-linear distortion
    • H03F1/3223—Modifications of amplifiers to reduce non-linear distortion using feed-forward
    • H03F1/3229—Modifications of amplifiers to reduce non-linear distortion using feed-forward using a loop for error extraction and another loop for error subtraction
    • H03F1/3235—Modifications of amplifiers to reduce non-linear distortion using feed-forward using a loop for error extraction and another loop for error subtraction using a pilot signal
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/06—Receivers
    • H04B1/10—Means associated with receiver for limiting or suppressing noise or interference
    • H04B1/12—Neutralising, balancing, or compensation arrangements
    • H04B1/123—Neutralising, balancing, or compensation arrangements using adaptive balancing or compensation means

Abstract

A power amplifier system and method for locating carrier frequencies across a frequency band, identifying the modulation format of each carrier, and locating and suppressing undesired intermodulation distortion (IMD) products generated by the power amplifier. The system includes an amplifier (138) for amplifying RF carrier signals in a main signal path (102), a variable phase shifter (122) and variable attenuator (120) on a feed forward path (104), and a tunable receiver (144) that digitizes a portion of the frequency band to baseband. The tunable receiver (144) includes a tunable voltage controlled oscillator (212) which provides an oscillating frequency to a mixer (204) and is phase-locked to a highly stable reference oscillator (208). The mixer (204) downconverts a desired RF based on the oscillating frequency to IF. A filter (220) passes only a selected portion of the IF signals, and the filter (220) has a passband sufficient to discern both narrowband and wideband carriers and their associated IMD products. Based on the locations of the carrier frequencies, a processing unit (240) determines the IMD locations of the carrier frequencies, determines the IMD locations, and adjusts the variable phase shifter (122) and variable attenuator (120) on the feed forward path (104) until the IMD products in the main signal path (103) are suppressed below a desired threshold.
PCT/US2002/006970 2001-03-07 2002-03-07 Digital baseband receiver in a multi-carrier power amplifier WO2002078176A2 (en)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
US27398701P 2001-03-07 2001-03-07
US60/273,987 2001-03-07
US10/091,756 US6829471B2 (en) 2001-03-07 2002-03-06 Digital baseband receiver in a multi-carrier power amplifier
US10/091,756 2002-03-06

Publications (2)

Publication Number Publication Date
WO2002078176A2 WO2002078176A2 (en) 2002-10-03
WO2002078176A3 true WO2002078176A3 (en) 2003-10-16

Family

ID=26784299

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US2002/006970 WO2002078176A2 (en) 2001-03-07 2002-03-07 Digital baseband receiver in a multi-carrier power amplifier

Country Status (2)

Country Link
US (1) US6829471B2 (en)
WO (1) WO2002078176A2 (en)

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Also Published As

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US20020127986A1 (en) 2002-09-12
WO2002078176A2 (en) 2002-10-03
US6829471B2 (en) 2004-12-07

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