Global Patent Index - EP 1080535 A1

EP 1080535 A1 20010307 - 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 20010307 (EN)

Application

EP 99919986 A 19990423

Priority

  • US 9908883 W 19990423
  • US 6607098 A 19980424

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

H04B 1/10; H04B 1/44

IPC 8 full level

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

CPC (source: EP)

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

DOCDB simple family (publication)

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

DOCDB simple family (application)

US 9908883 W 19990423; AU 3758099 A 19990423; EP 99919986 A 19990423