PATENTSCOPE will be unavailable a few hours for maintenance reason on Monday 03.02.2020 at 10:00 AM CET
Search International and National Patent Collections
Some content of this application is unavailable at the moment.
If this situation persists, please contact us atFeedback&Contact
1. (WO2009019460) AMPLIFIER CIRCUIT AND METHOD OF AMPLIFYING A SIGNAL IN AN AMPLIFIER CIRCUIT
Latest bibliographic data on file with the International Bureau

Pub. No.: WO/2009/019460 International Application No.: PCT/GB2008/002644
Publication Date: 12.02.2009 International Filing Date: 04.08.2008
IPC:
H03F 1/02 (2006.01) ,H03F 1/30 (2006.01)
H ELECTRICITY
03
BASIC ELECTRONIC CIRCUITRY
F
AMPLIFIERS
1
Details of amplifiers with only discharge tubes, only semiconductor devices or only unspecified devices as amplifying elements
02
Modifications of amplifiers to raise the efficiency, e.g. gliding Class A stages, use of an auxiliary oscillation
H ELECTRICITY
03
BASIC ELECTRONIC CIRCUITRY
F
AMPLIFIERS
1
Details of amplifiers with only discharge tubes, only semiconductor devices or only unspecified devices as amplifying elements
30
Modifications of amplifiers to reduce influence of variations of temperature or supply voltage
Applicants:
WOLFSON MICROELECTRONICS PLC [GB/GB]; Westfield House 26 Westfield Road Edinburgh EH11 2QB, GB (AllExceptUS)
LESSO, John, Paul [GB/GB]; GB (UsOnly)
Inventors:
LESSO, John, Paul; GB
Agent:
REES, Simon, John, Lewis; Haseltine Lake LLP Redcliff Quay 120 Redcliff Street Bristol BS1 6HU, GB
Priority Data:
0715254.903.08.2007GB
0716920.430.08.2007GB
0716923.830.08.2007GB
0721431.531.10.2007GB
0806471.909.04.2008GB
Title (EN) AMPLIFIER CIRCUIT AND METHOD OF AMPLIFYING A SIGNAL IN AN AMPLIFIER CIRCUIT
(FR) CIRCUIT D'AMPLIFICATEUR ET PROCÉDÉ D'AMPLIFICATION D'UN SIGNAL DANS UN CIRCUIT D'AMPLIFICATEUR
Abstract:
(EN) There is provided an amplifier circuit, comprising: an input, for receiving an input signal to be amplified; a power amplifier, for amplifying the input signal; a switched power supply, having a switching frequency, for providing at least one supply voltage to the power amplifier; and a dither block, for dithering the switching frequency of the switched power supply. The dither block is controlled based on the input signal. Another aspect of the invention involves using first and second switches, each having different capacitances and resistances, and using the first or second switch depending on the input signal or volume signal. Another aspect of the invention involves controlling a bias signal provided to one or more components in the signal path based on the input signal or volume signal.
(FR) La présente invention concerne un circuit d'amplificateur comprenant une entrée, un amplificateur de puissance, une alimentation électrique à commutation, et un oscillateur. L'entrée assure la réception du signal d'entrée à amplifier. L'amplificateur de puissance sert à amplifier le signal d'entrée. L'alimentation électrique à commutation dispose d'une fréquence de commutation permettant de fournir au moins une tension à l'amplificateur de puissance. L'oscillateur sert à faire osciller la fréquence de commutation de l'alimentation électrique à commutation. Le signal d'entrée sert de base à la commande de l'oscillateur. Un autre aspect de l'invention implique l'utilisation de premier et deuxième commutateurs présentant chacun des capacitances et résistances différentes, et l'utilisation du premier et du deuxième commutateur en fonction du signal d'entrée ou du signal de volume. Un autre aspect de l'invention implique la commande d'un signal de polarisation fourni à un ou plusieurs composants dans la voie du signal sur la base du signal d'entrée ou du signal de volume.
front page image
Designated States: AE, AG, AL, AM, AO, AT, AU, AZ, BA, BB, BG, BH, BR, BW, BY, BZ, CA, CH, CN, CO, CR, CU, CZ, DE, DK, DM, DO, DZ, EC, EE, EG, ES, FI, GB, GD, GE, GH, GM, GT, HN, HR, HU, ID, IL, IN, IS, JP, KE, KG, KM, KN, KP, KR, KZ, LA, LC, LK, LR, LS, LT, LU, LY, MA, MD, ME, MG, MK, MN, MW, MX, MY, MZ, NA, NG, NI, NO, NZ, OM, PG, PH, PL, PT, RO, RS, RU, SC, SD, SE, SG, SK, SL, SM, ST, SV, SY, TJ, TM, TN, TR, TT, TZ, UA, UG, US, UZ, VC, VN, ZA, ZM, ZW
African Regional Intellectual Property Organization (ARIPO) (BW, GH, GM, KE, LS, MW, MZ, NA, SD, SL, SZ, TZ, UG, ZM, ZW)
Eurasian Patent Organization (AM, AZ, BY, KG, KZ, MD, RU, TJ, TM)
European Patent Office (AT, BE, BG, CH, CY, CZ, DE, DK, EE, ES, FI, FR, GB, GR, HR, HU, IE, IS, IT, LT, LU, LV, MC, MT, NL, NO, PL, PT, RO, SE, SI, SK, TR)
African Intellectual Property Organization (BF, BJ, CF, CG, CI, CM, GA, GN, GQ, GW, ML, MR, NE, SN, TD, TG)
Publication Language: English (EN)
Filing Language: English (EN)
Also published as:
US20110221533CN101828333