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公开(公告)号：DE68915746T2
公开(公告)日：1994-12-22
申请号：DE68915746
申请日：1989-01-17
Applicant: MOTOROLA INC
Inventor： GAILUS PAUL , TURNEY WILLIAM , YESTER FRANCIS
Abstract: An improved apparatus and method for a sigma delta converter for bandpass signals is disclosed, suitable for use in mobile radio applications, between the front end and digital signal processing stages, that includes at least one bandpass filter, an n-level quantizer, an n-level digital-to-analog (D/A) converter, and a direct current (DC) feedback network. The sigma delta converter for bandpass signals may be configured in a second order or a fourth order embodiment and achieves analog-to-digital conversion of a signal having a non-zero frequency carrier or suppressed carrier with improved signal-to-noise ratio performance and with minimal quantization error. As a result, the sigma delta conversion occures earlier in a receiver chain and a dynamic range of about 95-98 dB is achieved.
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公开(公告)号：DE3851440D1
公开(公告)日：1994-10-13
申请号：DE3851440
申请日：1988-06-06
Applicant: MOTOROLA INC
Inventor： YESTER FRANCIS , TURNEY WILLIAM , GAILUS PAUL
Abstract: A low power digital receiver (10) is provided that contemporaneously selects the lowest possible sampling signal frequency (34) (from a plurality of available sampling signals), and received signal level (28) to properly digitize (32) and recover a desired signal. Digitization is performed after the first IF using broadband stages (28, 30, and 32) that are temporarily enabled (44) to rapidly digitize the first IF signal. This, together with the low sampling rate, minimizes the power consumption of the receiver (10) thereby permitting portable and mobile digital receiver embodiments.
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公开(公告)号：DE68915746D1
公开(公告)日：1994-07-07
申请号：DE68915746
申请日：1989-01-17
Applicant: MOTOROLA INC
Inventor： GAILUS PAUL , TURNEY WILLIAM , YESTER FRANCIS
Abstract: An improved apparatus and method for a sigma delta converter for bandpass signals is disclosed, suitable for use in mobile radio applications, between the front end and digital signal processing stages, that includes at least one bandpass filter, an n-level quantizer, an n-level digital-to-analog (D/A) converter, and a direct current (DC) feedback network. The sigma delta converter for bandpass signals may be configured in a second order or a fourth order embodiment and achieves analog-to-digital conversion of a signal having a non-zero frequency carrier or suppressed carrier with improved signal-to-noise ratio performance and with minimal quantization error. As a result, the sigma delta conversion occures earlier in a receiver chain and a dynamic range of about 95-98 dB is achieved.
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Patent Agency Ranking
公开(公告)号：DE69226952T2
公开(公告)日：1999-04-29
申请号：DE69226952
申请日：1992-06-02
Applicant: MOTOROLA INC
Inventor： STENGEL ROBERT , SHARP RONALD , YESTER FRANCIS
Abstract: A communication device 200 capable of operating in a communication system 100 having a control system which generates information signals with redundant information is disclosed. The communication device comprises: a receiver 214 for receiving the information signals; a circuit which can determine the signal quality of the received information signals 234; and a controller 226 which decodes the received information signals, and further compares the signal quality of the information signals with a predetermined value, and decides if the received signal quality is at least equal to the predetermined value in order to only decode a portion of the information signal. Upon the communication device decoding a portion of the information signal, the communication device 200 is placed in a battery saving mode in order to conserve battery life.
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公开(公告)号：DE69226952D1
公开(公告)日：1998-10-15
申请号：DE69226952
申请日：1992-06-02
Applicant: MOTOROLA INC
Inventor： STENGEL ROBERT , SHARP RONALD , YESTER FRANCIS
Abstract: A communication device 200 capable of operating in a communication system 100 having a control system which generates information signals with redundant information is disclosed. The communication device comprises: a receiver 214 for receiving the information signals; a circuit which can determine the signal quality of the received information signals 234; and a controller 226 which decodes the received information signals, and further compares the signal quality of the information signals with a predetermined value, and decides if the received signal quality is at least equal to the predetermined value in order to only decode a portion of the information signal. Upon the communication device decoding a portion of the information signal, the communication device 200 is placed in a battery saving mode in order to conserve battery life.
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公开(公告)号：DE69127069T2
公开(公告)日：1998-02-19
申请号：DE69127069
申请日：1991-09-30
Applicant: MOTOROLA INC
Inventor： GAILUS PAUL , YESTER FRANCIS , TURNEY WILLIAM
Abstract: A linear transmitter having both an open loop and a closed loop training mode capability functions to schedule and facilitate these training modes in a manner that reduces adjacent channel splatter. A training waveform can be utilized to enhance these operational objectives. Scheduling of the open loop and closed loop training modes can be ordered, in a TDM system, in a variety of ways.
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公开(公告)号：DE69127069D1
公开(公告)日：1997-09-04
申请号：DE69127069
申请日：1991-09-30
Applicant: MOTOROLA INC
Inventor： GAILUS PAUL , YESTER FRANCIS , TURNEY WILLIAM
Abstract: A linear transmitter having both an open loop and a closed loop training mode capability functions to schedule and facilitate these training modes in a manner that reduces adjacent channel splatter. A training waveform can be utilized to enhance these operational objectives. Scheduling of the open loop and closed loop training modes can be ordered, in a TDM system, in a variety of ways.
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公开(公告)号：DE3851440T2
公开(公告)日：1995-03-30
申请号：DE3851440
申请日：1988-06-06
Applicant: MOTOROLA INC
Inventor： YESTER FRANCIS , TURNEY WILLIAM , GAILUS PAUL
Abstract: A low power digital receiver (10) is provided that contemporaneously selects the lowest possible sampling signal frequency (34) (from a plurality of available sampling signals), and received signal level (28) to properly digitize (32) and recover a desired signal. Digitization is performed after the first IF using broadband stages (28, 30, and 32) that are temporarily enabled (44) to rapidly digitize the first IF signal. This, together with the low sampling rate, minimizes the power consumption of the receiver (10) thereby permitting portable and mobile digital receiver embodiments.
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