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公开(公告)号：JP2000134123A
公开(公告)日：2000-05-12
申请号：JP17176599
申请日：1999-06-18
Applicant: LUCENT TECHNOLOGIES INC
Inventor： BURKE MICHAEL EUGENE , LIPOWSKI JOSEPH THADDEUS , O'BOYLE LEONARD EDWARD , VAN DYKE RULON G , WEN JACK CHI-CHIEH
Abstract: PROBLEM TO BE SOLVED: To reduce the insertion loss of receiver sensitivity accompanying insertion of a variable attenuator by injecting a sensitivity suppression signal, such as a noise signal to a reception path and adjusting a power level of a noise on the reception path with respect to signal level. SOLUTION: A noise source 18 with a broadband, such as a noise diode, is employed and a sensitivity suppression signal is injected onto a reception path 20 at a downstream point of an output of a low noise amplifier 22. The noise source 18 is provided onto a sensitivity suppression path 24, and a variable attenuator 26 on the sensitivity suppression path 24 variably attenuates noise on the sensitivity suppression path 24. A coupler 28 of the reception path 20 receives the sensitivity suppressed signal on the sensitivity suppression path 24 and injects the signal to the reception path 20 to suppress the sensitivity of the receiver by using noise with a broadband from the noise source 18. The variable attenuator 26 has a function of adjusting the noise power injected onto the reception path 20 and in this way, sensitivity suppression at a different level is realized.
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Patent Agency Ranking
公开(公告)号：DE69900378T2
公开(公告)日：2002-09-05
申请号：DE69900378
申请日：1999-06-08
Applicant: LUCENT TECHNOLOGIES INC
Inventor： BURKE MICHAEL EUGENE , LIPOWSKI JOSEPH THADDEUS , O'BOYLE LEONARD EDWARD , VAN DYKE RULON G , WEN JACK CHI-CHIEH
Abstract: A receiver desensitization system sets the sensitivity of a receiver by injecting a desensitization signal appearing as noise onto a receive path of the receiver to adjust the noise power level relative to the power level of signals on the receive path. For example, a desensitization source (18) provides a desensitization signal appearing as noise onto a desensitization path. An adjustable attenuator (26) on the desensitization path adjusts the power level of the desensitization signal to provide a desired level of desensitization. The desensitization path is coupled (at 28) to a receive path of a receiver, and the desensitization signal is injected into the receive path. The desensitization signal desensitizes the receiver by raising the noise power level relative to the signal power level on the receive path. The desensitization signal can be injecting into the receive path after a main amplifier (22) on the receive path. By injecting the desensitization signal after the amplifier, the desensitization system reduces the contribution to the overall noise figure that would occur if any attenuation of the signal were to occur before the input to the amplifier. Depending on the application, the desensitization signal can be injected into the receive path at the radio frequency (RF), intermediate frequency (IF) or baseband stages of the receiver. The desensitization signal can take a variety of forms, such as broadband noise, a continuous wave signal, a modulated signal, or a digital pseudo-random noise sequence.
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公开(公告)号：AU761004B2
公开(公告)日：2003-05-29
申请号：AU3507399
申请日：1999-06-16
Applicant: LUCENT TECHNOLOGIES INC
Inventor： BURKE MICHAEL EUGENE , LIPOWSKI JOSEPH THADDEUS , O'BOYLE LEONARD EDWARD , VANDYKE RULON G , WEN JACK CHI-CHIEH
Abstract: A receiver desensitization system sets the sensitivity of a receiver by injecting a desensitization signal appearing as noise onto a receive path of the receiver to adjust the noise power level relative to the power level of signals on the receive path. For example, a desensitization source (18) provides a desensitization signal appearing as noise onto a desensitization path. An adjustable attenuator (26) on the desensitization path adjusts the power level of the desensitization signal to provide a desired level of desensitization. The desensitization path is coupled (at 28) to a receive path of a receiver, and the desensitization signal is injected into the receive path. The desensitization signal desensitizes the receiver by raising the noise power level relative to the signal power level on the receive path. The desensitization signal can be injecting into the receive path after a main amplifier (22) on the receive path. By injecting the desensitization signal after the amplifier, the desensitization system reduces the contribution to the overall noise figure that would occur if any attenuation of the signal were to occur before the input to the amplifier. Depending on the application, the desensitization signal can be injected into the receive path at the radio frequency (RF), intermediate frequency (IF) or baseband stages of the receiver. The desensitization signal can take a variety of forms, such as broadband noise, a continuous wave signal, a modulated signal, or a digital pseudo-random noise sequence.
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公开(公告)号：CA2271452C
公开(公告)日：2003-03-18
申请号：CA2271452
申请日：1999-05-12
Applicant: LUCENT TECHNOLOGIES INC
Inventor： LIPOWSKI JOSEPH THADDEUS , O'BOYLE LEONARD EDWARD , WEN JACK CHI-CHIEH , VANDYKE RULON G , BURKE MICHAEL E
Abstract: A receiver desensitization system sets the sensitivity of a receiver by injecting a desensitization signal appearing as noise onto a receive path of the receiver to adjust the noise power level relative to the power level of signals on the receive path. For example, a desensitization source provid es a desensitization signal appearing as noise onto a desensitization path. An adjustable attenuator on the desensitization path adjusts the power level of the desensitization signal to provide a desired level of desensitization. The desensitization path is coupled to a receive path of a receiver, and the desensitization signal is injected into the receive path. The desensitization signal desensitizes the receiver by raising the noise power level relative t o the signal power level on the receive path. The desensitization signal can be injecting into the receive path afte r a main amplifier on the receive path. By injecting the desensitization signal after the amplifier, the desensitization system reduces the contribution to the overall noise figure that would occur if any attenuation of the signal were to occur before the input to the amplifier. Depending on the application, the desensitization signal can be injected into the receive path at the radio frequency (RF), intermediate frequency (IF) or baseband stages of the receiver. The desensitization signal can take a variety of forms, such as broadband noise, a continuous wave signal, a modulated signal, or a digital pseudo-random noise sequence.
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公开(公告)号：DE69900378D1
公开(公告)日：2001-11-29
申请号：DE69900378
申请日：1999-06-08
Applicant: LUCENT TECHNOLOGIES INC
Inventor： BURKE MICHAEL EUGENE , LIPOWSKI JOSEPH THADDEUS , O'BOYLE LEONARD EDWARD , VAN DYKE RULON G , WEN JACK CHI-CHIEH
Abstract: A receiver desensitization system sets the sensitivity of a receiver by injecting a desensitization signal appearing as noise onto a receive path of the receiver to adjust the noise power level relative to the power level of signals on the receive path. For example, a desensitization source (18) provides a desensitization signal appearing as noise onto a desensitization path. An adjustable attenuator (26) on the desensitization path adjusts the power level of the desensitization signal to provide a desired level of desensitization. The desensitization path is coupled (at 28) to a receive path of a receiver, and the desensitization signal is injected into the receive path. The desensitization signal desensitizes the receiver by raising the noise power level relative to the signal power level on the receive path. The desensitization signal can be injecting into the receive path after a main amplifier (22) on the receive path. By injecting the desensitization signal after the amplifier, the desensitization system reduces the contribution to the overall noise figure that would occur if any attenuation of the signal were to occur before the input to the amplifier. Depending on the application, the desensitization signal can be injected into the receive path at the radio frequency (RF), intermediate frequency (IF) or baseband stages of the receiver. The desensitization signal can take a variety of forms, such as broadband noise, a continuous wave signal, a modulated signal, or a digital pseudo-random noise sequence.
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公开(公告)号：CA2271452A1
公开(公告)日：1999-12-19
申请号：CA2271452
申请日：1999-05-12
Applicant: LUCENT TECHNOLOGIES INC
Inventor： LIPOWSKI JOSEPH THADDEUS , BURKE MICHAEL E , O'BOYLE LEONARD EDWARD , VANDYKE RULON G , WEN JACK CHI-CHIEH
Abstract: A receiver desensitization system sets the sensitivity of a receiver by injecting a desensitization signal appearing as noise onto a receive path of the receiver to adjust the noise power level relative to the power level of signals on the receive path. For example, a desensitization source provides a desensitization signal appearing as noise onto a desensitization path. An adjustable attenuator on the desensitization path adjusts the power level of the desensitization signal to provide a desired level of desensitization. The desensitization path is coupled to a receive path of a receiver, and the desensitization signal is injected into the receive path. The desensitization signal desensitizes the receiver by raising the noise power level relative to the signal power level on the receive path. The desensitization signal can be injecting into the receive path after a main amplifier on the receive path. By injecting the desensitization signal after the amplifier, the desensitization system reduces the contribution to the overall noise figure that would occur if any attenuation of the signal were to occur before the input to the amplifier. Depending on the application, the desensitization signal can be injected into the receive path at the radio frequency (RF), intermediate frequency (IF) or baseband stages of the receiver. The desensitization signal can take a variety of forms, such as broadband noise, a continuous wave signal, a modulated signal, or a digital pseudo-random noise sequence.
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