-
公开(公告)号：BR9612319A
公开(公告)日：1999-07-13
申请号：BR9612319
申请日：1996-12-23
Applicant: QUALCOMM INC
Inventor： KORNFELD RICHARD K
Abstract: A diversity antenna system in a mobile unit which provides time, space and antenna pattern diversity to mitigate the effects of fading at a CDMA mobile unit. The system is comprised of a diversity antenna (105) and a main antenna (100). The main antenna (100) and diversity antenna (105) are physically separated and oriented such that they have different antenna gain patterns. In a first embodiment, the diversity antenna (105) functions as a receive antenna only, while the main antenna (100) performs both transmit and receive functions. In a second embodiment, both the main antenna (100) and the diversity antenna (105) transmit and receive signals. A delay circuit (130) couples the diversity antenna (105) to a summer (135) which sums the signals received by the main antenna (100) and the diversity antenna (105), respectively.
-
公开(公告)号：HK1006245A1
公开(公告)日：1999-02-19
申请号：HK98105438
申请日：1998-06-16
Applicant: QUALCOMM INC
Inventor： MARTIN CHRISTOPHER B , KORNFELD RICHARD 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.
-
公开(公告)号：CA2136749C
公开(公告)日：1998-11-03
申请号：CA2136749
申请日：1994-03-25
Applicant: QUALCOMM INC , ALPS ELECTRIC CO LTD
Inventor： KORNFELD RICHARD K , WEILAND ANA L , OKAZAKI MITSUNARI
Abstract: A control circuit for a multi-stage power amplifier (such as in a portable radio transmitter) compensates for fluctuations in ambient temperature, load, signal level and power supply voltage. The control voltage is set by comparing a biasing level which is related to the amplifier input signal level to a voltage proportional to the power supply current of the last stage of the amplifier. The control voltage resulting from the comparison establishes the operating point of the last stage of the power amplifier.
-
公开(公告)号：FI973994A
公开(公告)日：1997-12-15
申请号：FI973994
申请日：1997-10-17
Applicant: QUALCOMM INC
Inventor： KORNFELD RICHARD K
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：AU681642B2
公开(公告)日：1997-09-04
申请号：AU6416794
申请日：1994-03-25
Applicant: QUALCOMM INC , ALPS ELECTRIC CO LTD
Inventor： KORNFELD RICHARD K , WEILAND ANA L , OKAZAKI MITSUNARI
Abstract: A control circuit for a multi-stage power amplifier (such as in a portable radio transmitter) compensates for fluctuations in ambient temperature, load, signal level and power supply voltage, The control voltage is set by comparing a biasing level which is related to the amplifier input signal level to a voltage proportional to the power supply current of the last stage of the amplifier. The control voltage resulting from the comparison establishes the operating point of the last stage of the power amplifier.
-
Patent Agency Ranking
公开(公告)号：MX9703400A
公开(公告)日：1997-07-31
申请号：MX9703400
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 , H01P01/213 , H03H07/46
Abstract: Se expone en la presente un sistema de antena de doble banda para utilizarse en un dispositivo de comunicaciones. El sistema de antena incluye un elemento de antena (10) para irradiar energía electromagnética dentro de rangos de longitud de onda de banda baja y de banda elevada. En una modalidad preferida, una red aisladora de bandeja (20), acoplada al elemento de antena (10), proporciona aislamiento de señal entre las trayectorias de banda elevada y de banda baja durante la operacion de banda elevada. De manera similar, una red aisladora de banda elevada (18) proporciona el aislamiento de señal, durante la operacion sobre el rango de banda baja de longitudes de onda, entre las trayectorias de señal de banda elevada y de banda baja. Durante la operacion de transmision y recepcion, la energía electromagnética de banda baja y de banda elevada dirigida a través de la antena (10) se pasa mediante las redes aisladoras de banda baja y de banda elevada, (20) y (18), respectivamente. También se incluyen redes de comparacion de banda baja y de banda elevada (28) y (36), respectivamente, las cuales acoplan las redes aisladoras de banda baja y de banda elevada (20) y (18), respectivamente a la circuitería transceptora de banda baja y de banda elevada.
-
公开(公告)号：AU6974896A
公开(公告)日：1997-04-01
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
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：CA2204377A1
公开(公告)日：1997-03-20
申请号：CA2204377
申请日：1996-09-11
Applicant: QUALCOMM INC
Inventor： KORNFELD RICHARD K , WEILAND ANA L , PITTA THOMAS A , PETERZELL PAUL E , 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 (10) for radiating electromagnetic energy within low-band and high-band wavelength ranges. In a preferred embodiment, a low-band isolator network (20), coupled to the antenna element (10), provides signal isolation between high-band and low-band signal paths during high-band operation. Similarly, a high-band isolator network (18) provides signal isolation, during operation over the lowband 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 (10) is passed by the low-band and highband isolator networks, (20) and (18) respectively. Also included are low-band and high-band matching networks (28) and (36), respectively, which couple the low-band and high-band isolator networks (20) and (18), respectively, to lowband and high-band transceiver circuitry.
-
公开(公告)号：ZA9607264B
公开(公告)日：1997-03-04
申请号：ZA9607264
申请日：1996-08-27
Applicant: QUALCOMM INC
Inventor： PITTA THOMAS A , PETERZELL PAUL E , KORNFELD RICHARD K , WEILAND ANA L , WALLACE RAYMOND C
CPC classification number: H04B1/406 , H01P1/213 , H03H2007/386 , H04B1/005 , H04B1/18
-
公开(公告)号：AU674475B2
公开(公告)日：1996-12-19
申请号：AU1879795
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.
-
-
-
-
-
-
-
-
-
Search Results
125
records
(took 0.024 seconds)
