公开(公告)号：FI971759A0

公开(公告)日：1997-04-24

申请号：FI971759

申请日：1997-04-24

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 ,  H01Q

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：CA2218686A1

公开(公告)日：1996-10-24

申请号：CA2218686

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：ZA9602952B

公开(公告)日：1996-10-15

申请号：ZA9602952

申请日：1996-04-12

Applicant: QUALCOMM INC

Inventor： KORNFELD RICHARD K

IPC: H03G3/30 ,  H04B1/036 ,  H04B1/04 ,  H04B1/40 ,  H03G ,  H04B

CPC classification number: H03G3/3042 ,  H04B1/036 ,  H04B1/04

公开(公告)号：AU5091096A

公开(公告)日：1996-09-18

申请号：AU5091096

申请日：1996-03-01

Applicant: QUALCOMM INC

Inventor： MARTIN CHRISTOPHER B ,  KORNFELD RICHARD K ,  GREGORY SHERMAN

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

Abstract: A transceiver system for interfacing digital modems with radio frequency signals including an antenna, an antenna interface system and a modem interface system separated by a cable. The antenna is placed in a location having optimal reception and in close proximity to the antenna interface system. The cable couples the antenna interface system to the modem interface system. The modem interface system includes a two state variable attenuator and an attenuation register that are configured to either reduce the strength of the receive (Rx) signal when the modems are located near a base station, or to transmit the Rx signal without attenuation when the concentrated subscriber unit is at a more distant location. The outgoing, or transmit (Tx), signal is also attenuated in a similar manner to the incoming signal. A signal loss detection system includes a detector located in the modem interface system that receives an oscillating signal transmitted from the antenna interface system through the coaxial cable. A differentiating integrator then determines the amount of signal loss experienced by this oscillating signal during transmission through the coaxial cable and attenuates the signal from the antenna interface system accordingly so the amount of loss experienced remains constant. DC power is transmitted from the modem interface system to the antenna interface system through the coaxial cable. A maximum power limiting system detects when the signal being generated exceeds the capacity of the transmit power amplifier and transmits an alarm signal to the modem interface system.

公开(公告)号：ZA9601022B

公开(公告)日：1996-08-13

申请号：ZA9601022

申请日：1996-02-08

Applicant: QUALCOMM INC

Inventor： MARTIN CHRISTOPHER B ,  KORNFELD RICHARD K ,  GREGORY SHERMAN

IPC: H04B1/06 ,  H04B1/38 ,  H04B7/00 ,  H04B7/005 ,  H04L

CPC classification number: H04W52/52 ,  H04B1/3877

公开(公告)号：AU4419696A

公开(公告)日：1996-07-03

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：AU3728395A

公开(公告)日：1996-04-26

申请号：AU3728395

申请日：1995-09-27

Applicant: QUALCOMM INC

Inventor： KORNFELD RICHARD K ,  WHEATLEY CHARLES E III

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

Abstract: The dual band code division multiple access radio of the present invention operates on multiple frequencies simultaneously on either transmit or receive. The transmit path operates by splitting the transmit intermediate frequency (IF) path (103) and mixing the IF to two different transmit frequencies using two frequency synthesizers (140 and 145). The receive path (104) has two RF channels (116 and 117) that are mixed with the frequencies generated by the synthesizers (140 and 145) and summed into one IF strip. Thus the radio of the present invention can perform a soft hand-off between frequencies while communicating with both base stations simultaneously. Additional mixing paths and synthesizers can be added if it is desired to communicate with more than two base stations simultaneously.\!

公开(公告)号：CA2200960A1

公开(公告)日：1996-04-11

申请号：CA2200960

申请日：1995-09-27

Applicant: QUALCOMM INC

Inventor： WHEATLEY CHARLES E III ,  KORNFELD RICHARD K

IPC: H04B1/40 ,  H04B7/12 ,  H04Q7/22

Abstract: The dual band code division multiple access radio of the present invention operates on multiple frequencies simultaneously on either transmit or receive. The transmit path operates by splitting the transmit intermediate frequency (IF) path (103) and mixing the IF to two different transmit frequencies using two frequency synthesizers (140 and 145). The receive path (104) has two RF channels (116 and 117) that are mixed with the frequencies generated by the synthesizers (140 and 145) and summed into one IF strip. Thus the radio of the present invention can perform a soft hand-off between frequencies while communicating with both base stations simultaneously. Additional mixing paths and synthesizers can be added if it is desired to communicate with more than two base stations simultaneously.

公开(公告)号：BR9505674A

公开(公告)日：1996-01-16

申请号：BR9505674

申请日：1995-02-17

Applicant: QUALCOMM INC

Inventor： WEILAND ANA L ,  KORNFELD RICHARD K ,  KERR RICHARD J ,  MALONEY JOHN E ,  WILSON NATHANIEL B

IPC: H04B1/40 ,  H04B1/04 ,  H04B7/005 ,  H04B7/26 ,  H04W52/06 ,  H04W52/52

Abstract: The process and apparatus of the present invention limits the output power of a radiotelephone, operating in a cellular system in the preferred embodiment. This ensures the transmitted sidebands and synthesizer phase noise remains within a certain specification. This is accomplished by power detection and a correction accumulator that together generate a gain control signal by limiting the gain adjustment to a maximum value, even when the cell site communicating with the radiotelephone is sending power turn-up commands to the radiotelephone. This process includes dynamically correcting the output level of the transmitter due to gain variations in the transmitter stages or gain control elements.

公开(公告)号：CA2158577A1

公开(公告)日：1995-08-31

申请号：CA2158577

申请日：1995-02-17

Applicant: QUALCOMM INC

Inventor： WEILAND ANA L ,  KORNFELD RICHARD K ,  KERR RICHARD J ,  MALONEY JOHN E ,  WILSON NATHANIEL B

IPC: H04B1/40 ,  H04B1/04 ,  H04B7/005 ,  H04B7/26 ,  H04W52/06 ,  H04W52/52

Abstract: The process and apparatus of the present invention limits the output power of a radiotelephone, operating in a cellular system in the preferred embodiment. This ensures the transmitted sidebands and synthesizer phase noise remains within a certain specification. This is accomplished by power detection and a correction accumulator that together generate a gain control signal by limiting the gain adjustment to a maximum value, even when the cell site communicating with the radiotelephone is sending power turn-up commands to the radiotelephone. This process includes dynamically correcting the output level of the transmitter due to gain variations in the transmitter stages or gain control elements.