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公开(公告)号：JP2000082960A
公开(公告)日：2000-03-21
申请号：JP17040499
申请日：1999-06-17
Applicant: LUCENT TECHNOLOGIES INC
Inventor： WEN JACK CHI-CHIEH
Abstract: PROBLEM TO BE SOLVED: To execute SFDR enlargement without spurious radiation by generating an analog signal converted within the dynamic range (SFDR) of a first digital/analog converter(DAC) on a first route. SOLUTION: A DAC system 10 route-designates a first part in a digital signal S, namely, a part which is amplitude-restricted on a first route 16 against DAC 12. DAC 12 converts it into an analog system. The number of lowest bits in the digital input signal S which is route-designated against second DAC 14 reflects the clipping quantity of the amplitude on the digital input signal S. When the number of LSB, which is route-designated, is large, the clipping of the digital input signal S increases and the amplitude of composite signals S and D which are route-designated against first DAC 12 becomes small. The composite digital signal S of small amplitude with signal distortion D is supplied to first DAC 12 and a relatively small spurious distortion level is generated in an output signal level.
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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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公开(公告)号：JP2000049539A
公开(公告)日：2000-02-18
申请号：JP17038699
申请日：1999-06-17
Applicant: LUCENT TECHNOLOGIES INC
Inventor： MYER ROBERT EVAN , PATEL MOHAN , WEN JACK CHI-CHIEH
Abstract: PROBLEM TO BE SOLVED: To provide a mixer of a dynamic range that becomes wider. SOLUTION: A frequency mixing system uses a feedforward device to reduce the distortion of a signal which occurs due to the amplitude adjustment of an input signal and generates a needed frequency conversion signal which includes the cross modulation distortion of a level that is lower and/or allowable. For instance, the distortion of a signal from a 1st path can be introduced onto a 2nd path 22 and next, a frequency converted by using a 2nd mixer 38 on the path 22 is returned to the 1st path to supply a necessary frequency conversion signal including the cross modulation distortion of a level that is allowable and/or lower and to connect with the distortion of the signal on the 1st path. The frequency mixing system supplies an expanded dynamic range by increasing the difference between the amplitude of the necessary frequency conversion signal and the amplitude of the cross modulation distortion.
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公开(公告)号：JP2000013311A
公开(公告)日：2000-01-14
申请号：JP13231099
申请日：1999-05-13
Applicant: LUCENT TECHNOLOGIES INC
IPC: H04B1/40 , H04B1/00 , H04B1/10 , H04B1/12 , H04B1/38 , H04B1/50 , H04B7/00 , H04B7/005 , H04B7/155 , H04B7/26 , H04Q7/30
Abstract: PROBLEM TO BE SOLVED: To reduce transmitter overloading in a transmission scanning receiver by decreasing a transmitter signal that is sent from an overloaded transmitter and received by the transmission scanning receiver. SOLUTION: A part of a transmitter signal obtained from a transmission path 12 and sent on a coupling path 11 is adjusted, injected to a transmission scanning path 16 of a transmission scanning receiver 17, sent from a transmitter 26 and synthesized with the transmitter signal received by the transmission scanning receiver 17. A delay element 24 on the coupling path 11 is sent from the transmitter 26 and used to adjust a delay in the coupling path 11 so as to correspond to a delay of the transmitter signal received by the transmission scanning receiver 17. An amplitude and phase adjustment device 34 on the coupling path 11 adjusts the amplitude and the phase of the transmitter signal on the coupling path 11 to reduce the transmitter signal on the transmission scanning path 16. The measurement of the transmitter signal on the transmission scanning path is used to adjust the phase/amplitude of the signal on the coupling path 11 and to reduce a signal level.
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5.发明专利
公开(公告)号：JP2000106526A
公开(公告)日：2000-04-11
申请号：JP17040399
申请日：1999-06-17
Applicant: LUCENT TECHNOLOGIES INC
Inventor： MYER ROBERT EVAN , PATEL MOHAN , WEN JACK CHI-CHIEH
Abstract: PROBLEM TO BE SOLVED: To obtain an expanded dynamic range (SFDR) which contains no spurious by converting a control analog signal into a digital signal on a 1st path for generation of a converted signal that includes a spurious distortion. SOLUTION: An A/D (analog/digital) system 10 receives an analog signal S which is converted into a digital signal, and the signal S generates the spurious of a level where the conversion of the signal S that is carried out by a 1st A/D 12 is allowed. An amplitude is secured at the outside of an SFDR of the A/D 12 to generate a converted digital signal. A limiting device 14 controls, i.e., clips the amplitude of the signal S at a step before the A/D 12 and generates an output signal S as a result including an allowable spurious distortion. A signal distortion D is generated when the amplitude of an input signal S is controlled. Then the distortion D can be eliminated from the output of the system 10 when a sample of the distortion D is sent to the preceding stage.
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Patent Agency Ranking
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：DE69900116T2
公开(公告)日：2001-11-29
申请号：DE69900116
申请日：1999-06-08
Applicant: LUCENT TECHNOLOGIES INC
Inventor： MYER ROBERT EVAN , PATEL MOHAN , WEN JACK CHI-CHIEH
Abstract: An A/D system (10) provides an expanded SFDR when compared to the SFDR of individual A/D(s) that make up the A/D system. In response to an analog input signal(s) whose amplitude would result in a narrower SFDR for a first A/D (12), the A/D system uses an amplitude adjuster (14) which receives the analog input signal and produces an amplitude-limited signal with resulting signal distortion (S + D) to the first A/D (12). By amplitude-limiting the analog input signal, the A/D system produces the resulting signal distortion but reduces or "clips" the amplitude of the analog input signal, thereby improving the SFDR performance of the first A/D by reducing the spurious distortion produced by the first A/D. The signal distortion (D) resulting from the amplitude adjustment is routed to a second A/D (15). The first A/D converts the amplitude-limited analog signal to a digital signal (S + D ) with an expanded SFDR due to the lower amplitude of the adjusted analog signal. The second A/D (15) receives the portion of the analog input signal removed by clipping which can be referred to as the signal distortion (D). The second A/D converts the signal distortion, which typically has a lower amplitude than the adjusted analog signal, to a digital signal (D1) with at least an acceptable SFDR. The A/D system combines (16) the resulting digital signals from the first and second A/Ds to produce the desired converted digital signal with an extended SFDR. The SFDR is extended because the relative difference is increased between the amplitudes of the digital output signal and the spurious distortion when compared to the amplitudes of the digital output signal and the spurious distortion if the analog input signal has been converted by the first A/D without amplitude adjustment.
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公开(公告)号：DE69933259T2
公开(公告)日：2007-05-10
申请号：DE69933259
申请日：1999-06-08
Applicant: LUCENT TECHNOLOGIES INC
Inventor： WEN JACK CHI-CHIEH
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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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