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公开(公告)号：DE69530696D1
公开(公告)日：2003-06-12
申请号：DE69530696
申请日：1995-09-27
Applicant: QUALCOMM INC
Inventor： KORNFELD K , WHEATLEY E
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: 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.\!
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公开(公告)号：DE69627529T2
公开(公告)日：2004-03-04
申请号：DE69627529
申请日：1996-12-26
Applicant: QUALCOMM INC
Inventor： KORNFELD K , WHEATLEY E , CAMARILLO J , WHITE W
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.
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公开(公告)号：DE69533405T2
公开(公告)日：2005-09-01
申请号：DE69533405
申请日：1995-12-11
Applicant: QUALCOMM INC
Inventor： WHEATLEY E , PETERZELL E , KORNFELD K , WEILAND 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).
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公开(公告)号：DE69533405D1
公开(公告)日：2004-09-23
申请号：DE69533405
申请日：1995-12-11
Applicant: QUALCOMM INC
Inventor： WHEATLEY E , PETERZELL E , KORNFELD K , WEILAND 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).
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公开(公告)号：DE69530696T2
公开(公告)日：2004-02-26
申请号：DE69530696
申请日：1995-09-27
Applicant: QUALCOMM INC
Inventor： KORNFELD K , WHEATLEY E
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: 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.\!
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Patent Agency Ranking
公开(公告)号：DE69627529D1
公开(公告)日：2003-05-22
申请号：DE69627529
申请日：1996-12-26
Applicant: QUALCOMM INC
Inventor： KORNFELD K , WHEATLEY E , CAMARILLO J , WHITE W
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.
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公开(公告)号：DE69628550T2
公开(公告)日：2004-04-29
申请号：DE69628550
申请日：1996-03-01
Applicant: QUALCOMM INC
Inventor： MARTIN B , KORNFELD K , GREGORY SHERMAN
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.
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公开(公告)号：DE69628550D1
公开(公告)日：2003-07-10
申请号：DE69628550
申请日：1996-03-01
Applicant: QUALCOMM INC
Inventor： MARTIN B , KORNFELD K , GREGORY SHERMAN
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.
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公开(公告)号：DE69520812T2
公开(公告)日：2002-02-28
申请号：DE69520812
申请日：1995-02-17
Applicant: QUALCOMM INC
Inventor： WEILAND L , KORNFELD K , KERR J , MALONEY E , WILSON B
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.
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公开(公告)号：DE69520812D1
公开(公告)日：2001-06-07
申请号：DE69520812
申请日：1995-02-17
Applicant: QUALCOMM INC
Inventor： WEILAND L , KORNFELD K , KERR J , MALONEY E , WILSON B
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.
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