Processing

Please wait...

PATENTSCOPE will be unavailable a few hours for maintenance reason on Saturday 31.10.2020 at 7:00 AM CET
Settings

Settings

Goto Application

1. WO2007143246 - RF TRANSMITTER WITH VARIABLY BIASED RF POWER AMPLIFER AND METHOD THEREFOR

Publication Number WO/2007/143246
Publication Date 13.12.2007
International Application No. PCT/US2007/064363
International Filing Date 20.03.2007
IPC
H01Q 11/12 2006.01
HELECTRICITY
01BASIC ELECTRIC ELEMENTS
QANTENNAS, i.e. RADIO AERIALS
11Electrically-long antennas having dimensions more than twice the shortest operating wavelength and consisting of conductive active radiating elements
12Resonant antennas
CPC
H03C 5/00
HELECTRICITY
03BASIC ELECTRONIC CIRCUITRY
CMODULATION
5Amplitude modulation and angle modulation produced simultaneously or at will by the same modulating signal
H03F 1/02
HELECTRICITY
03BASIC ELECTRONIC CIRCUITRY
FAMPLIFIERS
1Details of amplifiers with only discharge tubes, only semiconductor devices or only unspecified devices as amplifying elements
02Modifications of amplifiers to raise the efficiency, e.g. gliding Class A stages, use of an auxiliary oscillation
H03F 1/0205
HELECTRICITY
03BASIC ELECTRONIC CIRCUITRY
FAMPLIFIERS
1Details of amplifiers with only discharge tubes, only semiconductor devices or only unspecified devices as amplifying elements
02Modifications of amplifiers to raise the efficiency, e.g. gliding Class A stages, use of an auxiliary oscillation
0205in transistor amplifiers
H03F 1/0227
HELECTRICITY
03BASIC ELECTRONIC CIRCUITRY
FAMPLIFIERS
1Details of amplifiers with only discharge tubes, only semiconductor devices or only unspecified devices as amplifying elements
02Modifications of amplifiers to raise the efficiency, e.g. gliding Class A stages, use of an auxiliary oscillation
0205in transistor amplifiers
0211with control of the supply voltage or current
0216Continuous control
0222by using a signal derived from the input signal
0227using supply converters
H03F 1/0261
HELECTRICITY
03BASIC ELECTRONIC CIRCUITRY
FAMPLIFIERS
1Details of amplifiers with only discharge tubes, only semiconductor devices or only unspecified devices as amplifying elements
02Modifications of amplifiers to raise the efficiency, e.g. gliding Class A stages, use of an auxiliary oscillation
0205in transistor amplifiers
0261with control of the polarisation voltage or current, e.g. gliding Class A
H03F 1/3241
HELECTRICITY
03BASIC ELECTRONIC CIRCUITRY
FAMPLIFIERS
1Details of amplifiers with only discharge tubes, only semiconductor devices or only unspecified devices as amplifying elements
32Modifications of amplifiers to reduce non-linear distortion
3241using predistortion circuits
Applicants
  • CRESTCOM, INC [US]/[US] (AllExceptUS)
  • MCCALLISTER, Ronald, Duane [US]/[US] (UsOnly)
  • BROMBAUGH, Eric, M. [US]/[US] (UsOnly)
Inventors
  • MCCALLISTER, Ronald, Duane
  • BROMBAUGH, Eric, M.
Agents
  • GRESHAM, Lowell, W.
Priority Data
11/445,81602.06.2006US
Publication Language English (EN)
Filing Language English (EN)
Designated States
Title
(EN) RF TRANSMITTER WITH VARIABLY BIASED RF POWER AMPLIFER AND METHOD THEREFOR
(FR) ÉMETTEUR RF AVEC AMPLIFICATEUR DE PUISSANCE RF À POLARISATION VARIABLE ET PROCÉDÉ CORRESPONDANT
Abstract
(EN)
An RF transmitter (30) includes an RF power amplifier (32) for which the power input bias voltage (40) and signal input bias voltage (80) are controlled within feedback loops. A peak detector (44) generates a lowered-spectrum, peak-tracking signal (34) that follows the largest amplitude peaks of a wide bandwidth communication signal (16) but exhibits a lower bandwidth. This signal (34) is scaled in response to the operation of a drain bias tracking loop (146) then used to control a switching power supply (36) that generates the power input bias voltage. The tracking loop (146) is responsive to out-of-band power detected in a portion of the amplified RF communication signal (16'). A ratio of out-of-band power (128) to in-band power (126) is manipulated in the tracking loop (146) so that the power input bias voltage is modulated in a way that holds the out-of-band power at a desired predetermined level.
(FR)
L'invention concerne un émetteur RF (30) comportant un amplificateur de puissance RF (32) pour lequel la tension de polarisation d'entrée d'alimentation (40) et la tension de polarisation d'entrée de signal (80) sont contrôlées par des boucles de rétroaction. Un détecteur de pic (44) génère un signal de traçage de pic à spectre diminué (34) qui suit les plus grands pics d'amplitude d'un signal (16) de communication à large bande passante, mais présente une bande passante inférieure. En réponse à l'opération d'une boucle de traçage de polarisation de drain (146), le signal (34) est mis à l'échelle puis utilisé pour commander une alimentation électrique de commutation (36) qui génère la tension de polarisation d'entrée d'alimentation. La boucle de traçage de polarisation de drain (146) est sensible à la puissance hors-bande détectée dans une partie du signal de communication RF amplifié (16'). Un rapport de la puissance hors-bande (128) à la puissance dans la bande (126) est manipulé dans la boucle de traçage de polarisation de drain (146), de telle sorte que la tension de polarisation d'entrée d'alimentation est modulée d'une façon qui maintient la puissance hors-bande à un niveau prédéterminé désiré.
Also published as
Latest bibliographic data on file with the International Bureau