公开(公告)号：AU1425099A

公开(公告)日：1999-04-22

申请号：AU1425099

申请日：1999-01-29

Applicant: QUALCOMM INC

Inventor： WHEATLEY CHARLES E III ,  WEILAND ANA L ,  KORNFELD RICHARD K ,  PETERZELL PAUL E

IPC: H04B1/06 ,  H03G1/00 ,  H03G3/30 ,  H04B20060101 ,  H04B1/10 ,  H04B1/16 ,  H04B1/18 ,  H04B1/40 ,  H04B1/7075 ,  H04B1/7097 ,  H04B3/06 ,  H04B7/005 ,  H04B7/26 ,  H04B15/00

Abstract: An apparatus to increase a radio receiver's immunity to radio frequency interference, the radio receiver receiving a signal, the apparatus comprising: a switch (1105) coupled to the received signal, the switch (1105) having an open position and a closed position; a resistance (1101), a first end of the resistance (1101) being coupled to the closed position of the switch (1105) and a second end of the resistance (1101) being coupled to a ground potential; an amplifier (1101) having an input coupled to the open position of the switch (1105), for generating an amplified received signal at an output; a controller coupled to the switch (1105), for switching the switch (1105) to the closed position in response to the received signal exceeding a predetermined power level, said received signal conducting through said switch (1105) and said resistance (1101) to ground potential when said switch (1105) is in said closed position; and said resistance (1101) creating an impedance mismatch at the input to said amplifier (1110) when said switch (1105) is in closed position, thereby reducing the gain contributed by said amplifier (1110).

公开(公告)号：AU1424899A

公开(公告)日：1999-04-01

申请号：AU1424899

申请日：1999-01-29

Applicant: QUALCOMM INC

Inventor： WHEATLEY CHARLES E III ,  WEILAND ANA L ,  KORNFELD RICHARD K ,  PETERZELL PAUL E

IPC: H04B1/06 ,  H03G1/00 ,  H03G3/30 ,  H04B20060101 ,  H04B1/10 ,  H04B1/16 ,  H04B1/18 ,  H04B1/40 ,  H04B1/7075 ,  H04B1/7097 ,  H04B3/06 ,  H04B7/005 ,  H04B7/26 ,  H04B15/00

Abstract: An apparatus to increase a radio receiver's immunity to radio frequency interference, the radio receiver receiving a signal, the apparatus comprising: a switch (1105) coupled to the received signal, the switch (1105) having an open position and a closed position; a resistance (1101), a first end of the resistance (1101) being coupled to the closed position of the switch (1105) and a second end of the resistance (1101) being coupled to a ground potential; an amplifier (1101) having an input coupled to the open position of the switch (1105), for generating an amplified received signal at an output; a controller coupled to the switch (1105), for switching the switch (1105) to the closed position in response to the received signal exceeding a predetermined power level, said received signal conducting through said switch (1105) and said resistance (1101) to ground potential when said switch (1105) is in said closed position; and said resistance (1101) creating an impedance mismatch at the input to said amplifier (1110) when said switch (1105) is in closed position, thereby reducing the gain contributed by said amplifier (1110).

公开(公告)号：AU703393B2

公开(公告)日：1999-03-25

申请号：AU4419696

申请日：1995-12-11

Applicant: QUALCOMM INC

Inventor： WHEATLEY CHARLES E III ,  PETERZELL PAUL E ,  KORNFELD RICHARD K ,  WEILAND ANA L

IPC: H04B1/06 ,  H03G1/00 ,  H03G3/30 ,  H04B20060101 ,  H04B1/10 ,  H04B1/16 ,  H04B1/18 ,  H04B1/40 ,  H04B1/7075 ,  H04B1/7097 ,  H04B3/06 ,  H04B7/005 ,  H04B7/26 ,  H04B15/00

Abstract: An apparatus to increase a radio receiver's immunity to radio frequency interference, the radio receiver receiving a signal, the apparatus comprising: a switch (1105) coupled to the received signal, the switch (1105) having an open position and a closed position; a resistance (1101), a first end of the resistance (1101) being coupled to the closed position of the switch (1105) and a second end of the resistance (1101) being coupled to a ground potential; an amplifier (1101) having an input coupled to the open position of the switch (1105), for generating an amplified received signal at an output; a controller coupled to the switch (1105), for switching the switch (1105) to the closed position in response to the received signal exceeding a predetermined power level, said received signal conducting through said switch (1105) and said resistance (1101) to ground potential when said switch (1105) is in said closed position; and said resistance (1101) creating an impedance mismatch at the input to said amplifier (1110) when said switch (1105) is in closed position, thereby reducing the gain contributed by said amplifier (1110).

公开(公告)号：BR9612335A

公开(公告)日：1999-03-02

申请号：BR9612335

申请日：1996-12-26

Applicant: QUALCOMM INC

Inventor： KORNFELD RICHARD K ,  WHITE KATHERINE W ,  WHEATLEY CHARLES E III ,  CAMARILLO RICHARD J

IPC: H03F99/00 ,  H03F1/02 ,  H03F1/32 ,  H03F3/60 ,  H03F3/68 ,  H03F3/72 ,  H03G3/02 ,  H03G3/30 ,  H04B1/04 ,  H04B7/26 ,  H04J13/00

Abstract: An amplifier circuit for providing an amplified signal in response to an input signal. The amplifier circuit includes an input network for applying the input signal to a selected at least one of a plurality of amplifier stages. An output network is provided for coupling the amplified signal from the selected at least one amplifier stage. The appropriate amplifier stage is selected by a control circuit in response to a desired power value of the amplified signal. By selectively activating only the amplifier stage(s) that are necessary to provide the desired level of output power, increased DC efficiency can be accomplished in applications that require an amplifier which operates linearly over a wide dynamic range.

公开(公告)号：AU701323B2

公开(公告)日：1999-01-28

申请号：AU6974896

申请日：1996-09-11

Applicant: QUALCOMM INC

Inventor： PITTA THOMAS A ,  PETERZELL PAUL E ,  KORNFELD RICHARD K ,  WEILAND ANA L ,  WALLACE RAYMOND C

IPC: H01P1/213 ,  H03H7/46 ,  H04B1/40

Abstract: A dual-band antenna system for use in a portable communications device is disclosed herein. The antenna system includes an antenna element for radiating electromagnetic energy within low-band and high-band wavelength ranges. In a preferred embodiment, a low-band isolator network, coupled to the antenna element, provides signal isolation between high-band and low-band signal paths during high-band operation. Similarly, a high-band isolator network provides signal isolation, during operation over the low-band range of wavelengths, between the high-band and low-band signal paths. During transmit and receive operation, low-band and high-band electromagnetic energy directed through the antenna is passed by the low-band and high-band isolator networks, respectively. Also included are low-band and high-band matching networks which couple the low-band and high-band isolator networks to low-band and high-band transceiver circuitry.

公开(公告)号：BR9608406A

公开(公告)日：1998-12-29

申请号：BR9608406

申请日：1996-04-22

Applicant: QUALCOMM INC

Inventor： KORNFELD RICHARD K

IPC: H03G3/30 ,  H04B1/036 ,  H04B1/04 ,  H04B1/40 ,  H03G3/20

Abstract: The process and apparatus of the present invention limits the output power of a radio in response to the temperature of key components of the radio. Temperature sensors (1025) measure the temperature of the components and send the temperature signals to power control circuitry (1030). The transmit power is measured (1020) at the output of the power amplifier (1015). As the temperature increases, the power control circuitry (1030) reduces the transmit power to reduce the temperature of the key components. The power is monitored so that it is not reduced below the power level required by standards.

公开(公告)号：MX9702264A

公开(公告)日：1998-04-30

申请号：MX9702264

申请日：1995-09-27

Applicant: QUALCOMM INC

Inventor： KORNFELD RICHARD K ,  WHEATLEY CHARLES E III

IPC: H04B1/38 ,  H04B1/40 ,  H04B7/005 ,  H04B7/12 ,  H04B7/208 ,  H04B7/26 ,  H04J1/04 ,  H04L1/04 ,  H04L5/06 ,  H04Q11/02 ,  H04W36/14 ,  H04W36/18

Abstract: El radio de acceso multiple por division de codigo de banda dual de la presente invencion opera en varias frecuencias en forma simultánea, ya sea para recibir o transmitir. La trayectoria de transmision opera dividiendo la trayectoria de frecuencia intermedia de transmision (IF) (103) y mezclando la IF con dos frecuencias de transmision diferentes, utilizando dos sintetizadores de frecuencia (140 y 145). La trayectoria de recepcion (104) tiene dos canales RF (116 y 117) que se mezclan con las frecuencias generadas por los sintetizadores (140 y 145) y se suman en una tira IF. De esta manera el radio de la presente invencion puede efectuar una transferencia de transmision suave entre frecuencias, mientras se comunica simultáneamente con las dos estaciones base. Otras trayectorias de mezclado y otros sintetizadores pueden adicionarse si se desea tener comunicacion con más de dos estaciones base en forma simultánea.

公开(公告)号：MX9706612A

公开(公告)日：1997-11-29

申请号：MX9706612

申请日：1996-03-01

Applicant: QUALCOMM INC

Inventor： MARTIN CRISTOPHER ,  KORNFELD RICHARD K ,  GREGORY SHERMAN

IPC: H04B1/06 ,  H04B1/38 ,  H04B7/00 ,  H04B7/005 ,  H04B01/38 ,  H04B07/005

Abstract: Se describe un sistema transceptor para interconectar modems digitales con señales de radiofrecuencia. El sistema incluye una interconexion de modem conectada a la interconexion de antena mediante un cable coaxial, y una antena. Los circuitos que proporcionan regulacion de potencia de las señales intercambiadas incluyen circuitos de deteccion de potencia y atenuadores en la interconexion de antena así como en la interconexion de modem.

公开(公告)号：FI972501A

公开(公告)日：1997-08-15

申请号：FI972501

申请日：1997-06-12

Applicant: QUALCOMM INC

Inventor： WHEATLEY III CHARLES E ,  KORNFELD RICHARD K ,  PETERZELL PAUL E ,  WEILAND ANA L

IPC: H04B1/06 ,  H03G1/00 ,  H03G3/30 ,  H04B20060101 ,  H04B1/10 ,  H04B1/16 ,  H04B1/18 ,  H04B1/40 ,  H04B1/7075 ,  H04B1/7097 ,  H04B3/06 ,  H04B7/005 ,  H04B7/26 ,  H04B15/00 ,  H04B

Abstract: An apparatus to increase a radio receiver's immunity to radio frequency interference, the radio receiver receiving a signal, the apparatus comprising: a switch (1105) coupled to the received signal, the switch (1105) having an open position and a closed position; a resistance (1101), a first end of the resistance (1101) being coupled to the closed position of the switch (1105) and a second end of the resistance (1101) being coupled to a ground potential; an amplifier (1101) having an input coupled to the open position of the switch (1105), for generating an amplified received signal at an output; a controller coupled to the switch (1105), for switching the switch (1105) to the closed position in response to the received signal exceeding a predetermined power level, said received signal conducting through said switch (1105) and said resistance (1101) to ground potential when said switch (1105) is in said closed position; and said resistance (1101) creating an impedance mismatch at the input to said amplifier (1110) when said switch (1105) is in closed position, thereby reducing the gain contributed by said amplifier (1110).

公开(公告)号：ZA9610942B

公开(公告)日：1997-06-30

申请号：ZA9610942

申请日：1996-12-30

Applicant: QUALCOMM INC

Inventor： KORNFELD RICHARD K ,  WHEATLEY CHARLES E III ,  CAMARILLO RICHARD J ,  WHITE KATHERINE W

IPC: H03F1/02 ,  H03F1/32 ,  H03F3/60 ,  H03F99/00 ,  H03F3/68 ,  H03F3/72 ,  H03G3/02 ,  H03G3/30 ,  H04B1/04 ,  H04B7/26 ,  H04J13/00 ,  H03F ,  H04Q ,  H04B

Abstract: An amplifier circuit for providing an amplified signal in response to an input signal. The amplifier circuit includes an input network for applying the input signal to a selected at least one of a plurality of amplifier stages. An output network is provided for coupling the amplified signal from the selected at least one amplifier stage. The appropriate amplifier stage is selected by a control circuit in response to a desired power value of the amplified signal. By selectively activating only the amplifier stage(s) that are necessary to provide the desired level of output power, increased DC efficiency can be accomplished in applications that require an amplifier which operates linearly over a wide dynamic range.