Global patent index - EP 1080535 A1

EP 1080535 A1 2001-03-07 - CIRCUIT FOR REDUCTION OF CROSS MODULATION AND INCREASED BATTERY LIFE IN A BATTERY POWERED TRANSCEIVER

Title (en)

CIRCUIT FOR REDUCTION OF CROSS MODULATION AND INCREASED BATTERY LIFE IN A BATTERY POWERED TRANSCEIVER

Title (de)

SCHALTUNG ZUR VERRINGERUNG DER KREUZMODULATION UND ZUR VERLÄNGERUNG DER BATTERIELEBENSDAUER IN EINEM BATTERIEBETRIEBENEN SENDEEMPFÄNGER

Title (fr)

CIRCUIT DE REDUCTION DE TRANSMODULATION ET D'ACCROISSEMENT DE LA DUREE D'UNE BATTERIE DANS UN EMETTEUR-RECEPTEUR ALIMENTE PAR BATTERIE

Publication

EP 1080535 A1 (EN)

Application

EP 99919986 A

Priority

  • US 9908883 W
  • US 6607098 A

Abstract (en)

[origin: WO9956401A1] A battery powered transceiver including a circuit (52) for increasing the bias current of a low noise amplifier (LNA) (50), in the receiver section of the transceiver, during the time that the transmitter of the transceiver is transmitting, and for reducing the bias current when the transmitter is not transmitting. The increased bias current causes the LNA (50) to operate in a highly linear mode and it is thus less susceptible to cross modulation when transmitting at high power in the presence of a high power "jammer". Since the high bias current level only exists when the transmitter is on (transmitting), current drain on the battery is reduced thus increasing standby time and talk time. In a preferred embodiment, a signal indicative of the state of the transceiver's transmitter causes a switch (Q24) to close only when the transmitter is transmitting, thereby inserting a resister (R12) in parallel with a biasing resister (R11) and raising the bias current of the low noise amplifier.

IPC 1-7 (main, further and additional classification)

H04B 1/10; H04B 1/44

IPC 8 full level (invention and additional information)

H04B 1/10 (2006.01); H04B 1/16 (2006.01)

CPC (invention and additional information)

H04B 1/109 (2013.01)

Citation (search report)

See references of WO 9956401A1

Designated contracting state (EPC)

AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE

EPO simple patent family

WO 9956401 A1 19991104; AU 3758099 A 19991116; EP 1080535 A1 20010307

INPADOC legal status

2002-05-15 [18D] DEEMED TO BE WITHDRAWN

- Ref Legal Event Code: 18D

- Effective date: 20011102

2001-03-07 [17P] REQUEST FOR EXAMINATION FILED

- Ref Legal Event Code: 17P

- Effective date: 20001124

2001-03-07 [AK] DESIGNATED CONTRACTING STATES:

- Ref Legal Event Code: AK

- Designated State(s): AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE