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1. (WO2003105357) METHOD AND APPARATUS FOR DC OFFSET REMOVAL IN A RADIO FREQUENCY COMMUNICATION CHANNEL
Latest bibliographic data on file with the International Bureau   

Pub. No.: WO/2003/105357 International Application No.: PCT/US2003/016403
Publication Date: 18.12.2003 International Filing Date: 27.05.2003
Chapter 2 Demand Filed: 29.12.2003
IPC:
H04B 1/30 (2006.01)
H ELECTRICITY
04
ELECTRIC COMMUNICATION TECHNIQUE
B
TRANSMISSION
1
Details of transmission systems, not covered by a single one of groups H04B3/-H04B13/123; Details of transmission systems not characterised by the medium used for transmission
06
Receivers
16
Circuits
30
for homodyne or synchrodyne receivers
Applicants:
PARKERVISION, INC. [US/US]; 8493 Baymeadows Way Jacksonville, FL 32256, US
Inventors:
RAWLINS, Gregory, S.; US
BROWN, Kevin; US
RAWLINS, Michael, W.; US
SORRELLS, David, F.; US
Agent:
LEE, Michael, Q.; Sterne, Kessler, Goldstein & Fox PLLC 1100 New York Avenue, NW Washington, DC 20005-3934, US
Priority Data:
10/290,32308.11.2002US
60/384,83404.06.2002US
Title (EN) METHOD AND APPARATUS FOR DC OFFSET REMOVAL IN A RADIO FREQUENCY COMMUNICATION CHANNEL
(FR) PROCEDE ET APPAREIL DE SUPPRESSION DE DECALAGE EN CONTINU DANS UN CANAL DE COMMUNICATION RF
Abstract:
(EN) A filter module (1702) for reducing a DC offset voltage in a radio frequency communication channel is described. A first capacitor (1706) is coupled between a first differential input node (1728) and a first differential output node (1720). A second capacitor (1708) is coupled between a second differential input node (1730) and a second differential output node (1722). An active variable resistor (1704) is coupled between the first differential output node and the second differential output node. The active variable resistor receives a control signal. The control signal (1710) adjusts the value of the active variable resistor, which adjusts the frequency response of the filter module. The rate at which the filter module reduces DC offset voltages is thereby adjusted. The filter module is also adaptable to single-ended applications.
(FR) L'invention concerne un module de filtre (1702) permettant de réduire une tension de décalage en continu dans un canal de communication RF. Un premier condensateur (1706) est raccordé entre un premier noeud d'entrée différentiel (1728) et un premier noeud de sortie différentiel (1720). Un second condensateur (1708) est raccordé entre un second noeud d'entrée différentiel (1730) et un second noeud de sortie différentiel (1722). Une résistance variable active (1704) est raccordée entre le premier noeud de sortie différentiel et le second noeud de sortie différentiel. Ladite résistance variable active reçoit une signal de commande. Ce signal de commande (1710) ajuste la valeur de ladite résistance variable active, qui ajuste la réponse de fréquence du module de filtre. Ceci permet d'ajuster la vitesse à laquelle le module de filtre réduit les tensions de décalage en continu. Ledit module de filtre peut également être adapté à des applications asymétriques.
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Designated States: AE, AG, AL, AM, AT, AU, AZ, BA, BB, BG, BR, BY, BZ, CA, CH, CN, CO, CR, CU, CZ, DE, DK, DM, DZ, EC, EE, ES, FI, GB, GD, GE, GH, GM, HR, HU, ID, IL, IN, IS, JP, KE, KG, KP, KR, KZ, LC, LK, LR, LS, LT, LU, LV, MA, MD, MG, MK, MN, MW, MX, MZ, NI, NO, NZ, OM, PH, PL, PT, RO, RU, SC, SD, SE, SG, SK, SL, TJ, TM, TN, TR, TT, TZ, UA, UG, UZ, VC, VN, YU, ZA, ZM, ZW
African Regional Intellectual Property Organization (ARIPO) (GH, GM, KE, LS, MW, MZ, SD, SL, SZ, TZ, UG, ZM, ZW)
Eurasian Patent Office (AM, AZ, BY, KG, KZ, MD, RU, TJ, TM)
European Patent Office (EPO) (AT, BE, BG, CH, CY, CZ, DE, DK, EE, ES, FI, FR, GB, GR, HU, IE, IT, LU, MC, NL, 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)