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公开(公告)号：CA2207745C
公开(公告)日：2004-10-26
申请号：CA2207745
申请日：1995-12-11
Applicant: QUALCOMM INC
Inventor： PETERZELL PAUL E , KORNFELD RICHARD K , WEILAND ANA L , WHEATLEY CHARLES E III
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 , H04Q7/32
Abstract: The method and apparatus of the present invention improve the immunity to interference of a radio receiver. The power level of a received signal is detected. If the power level meets or exceeds a predetermined power threshold, the low noise amplifier (703) is by-passed (730), thus increasing the intercept point of the receiver components. Alternative embodiments include the use of an RF power detector (105) to control the front-end gain (110) as a function of jammer power. In lieu of a switchable RF gain block (730), several methods of continuous gain control are proposed. Continuous gain control allows the interference suppression and sensitivity of the receiver to be adjusted at lower signal levels than the switchable gain block. A method of the present invention adjusts the input gain by a predetermined amount (1601). The receiver processing measures the gain change in the IF signal power (1605). If the change is less than the predetermined amount (1610), the CDMA signal and jammers are below the noise floor and, therefore, the gain is increased (1615). If the IF signal power change is greater than the predetermined amount, the interference is evident and the gain is reduced to reduce the intermodulation products (1620). This process is used until the receiver is operating at the best compromise between interference and noise figure.
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公开(公告)号：MY114796A
公开(公告)日：2003-01-31
申请号：MYPI9603598
申请日：1996-08-29
Applicant: QUALCOMM INC
Inventor： PITTA THOMAS A , WEILAND ANA L , PETERZELL PAUL E , WALLACE RAYMOND C , KORNFELD RICHARD K
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 ELELCTROMAGNETIC 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.
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公开(公告)号：RU2196384C2
公开(公告)日：2003-01-10
申请号：RU97111882
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: FIELD: radio communications. SUBSTANCE: power level of received signal is determined in all design alternates and if this level is equal to or higher than predetermined threshold value, received- signal amplifier gain is controlled in radio receiver. Amplifier gain is controlled either by shorting out the amplifier or by continuously controlling its gain. Continuous gain control enables noise suppression and matching of radio receiver sensitivity at lower levels of signal than those in shorted-out amplifier. EFFECT: enhanced noise immunity. 10 cl, 15 dwg
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公开(公告)号：BR9606630A
公开(公告)日：1998-01-06
申请号：BR9606630
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
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.
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公开(公告)号：CA2164323A1
公开(公告)日：1994-12-22
申请号：CA2164323
申请日：1994-06-03
Applicant: QUALCOMM INC , ALPS ELECTRIC CO LTD
Inventor： KORNFELD RICHARD L , WEILAND ANA L , OKAZAKI MITSUNARI
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Patent Agency Ranking
公开(公告)号：FI20060862A
公开(公告)日：2006-09-27
申请号：FI20060862
申请日：2006-09-27
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
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：ES2158088T3
公开(公告)日：2001-09-01
申请号：ES95911058
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
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：AT200946T
公开(公告)日：2001-05-15
申请号：AT95911058
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
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：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).
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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).
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