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公开(公告)号：GB2347292A
公开(公告)日：2000-08-30
申请号：GB0003945
申请日：2000-02-18
Applicant: MOTOROLA INC
Inventor： PECKHAM DAVID SUTHERLAND , DING DAVID Z , SKUTTA FRANK ROBERT , JOHNSON JR ROBERT M
Abstract: A multi-band receiver 102 has respective bandpass filters 306 and 304 for two closely spaced but distinct channels, e.g. 1.8 GHz DCS and 1.9 GHz PCS frequencies. A further bandpass filter 318 is coupled in series with a selected one of the filters 306 or 304, and has a passband which includes both reception bands. Sharing of the filter 318 between the two channels reduces cost and volume. The filter 318 may precede or follow the filters 306 and 304. A fourth filter 308 passes signals in a further band widely spaced from the other bands, e.g. a 900 MHz GSM band.
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公开(公告)号：GB2294602B
公开(公告)日：1999-05-19
申请号：GB9526296
申请日：1995-02-23
Applicant: MOTOROLA INC
Inventor： DUONG MINH HOANG , DORSEY DONALD A , JOHNSON JR ROBERT M
Abstract: A receiver has a channel scan mode of operation and a communication mode of operation. In the channel mode of operation, the passband of a filter is narrowed relative to the passband of the filter in the communication mode. According to another aspect of the circuit, a local oscillator is selectively phase locked to an internal clock during channel scanning and locked to the incoming signal during a communication mode operation.
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Patent Agency Ranking
公开(公告)号：ITRM960870D0
公开(公告)日：1996-12-16
申请号：ITRM960870
申请日：1996-12-16
Applicant: MOTOROLA INC
Inventor： OTTING MARCIA J , JOHNSON JR ROBERT M
Abstract: An apparatus (304) for scanning among a plurality of channels in a radio communication system (300) includes receive circuitry (310) and control circuitry (312). The receive circuitry (310) is capable of being tuned to any one of the plurality of channels and measures reception strength of the tuned channel. The control circuitry (312) controls the receive circuitry (310) to scan through all of the plurality of channels one at a time. The control circuitry (312) stores a first reading of a measured reception strength of the tuned channel before powering off the receive circuitry (310). The control circuitry (312) stores a second reading of a measured reception strength of the tuned channel after powering the receive circuitry (310) back on.
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公开(公告)号：IT1289252B1
公开(公告)日：1998-09-29
申请号：ITRM960870
申请日：1996-12-16
Applicant: MOTOROLA INC
Inventor： OTTING MARCIA J , JOHNSON JR ROBERT M
Abstract: An apparatus (304) for scanning among a plurality of channels in a radio communication system (300) includes receive circuitry (310) and control circuitry (312). The receive circuitry (310) is capable of being tuned to any one of the plurality of channels and measures reception strength of the tuned channel. The control circuitry (312) controls the receive circuitry (310) to scan through all of the plurality of channels one at a time. The control circuitry (312) stores a first reading of a measured reception strength of the tuned channel before powering off the receive circuitry (310). The control circuitry (312) stores a second reading of a measured reception strength of the tuned channel after powering the receive circuitry (310) back on.
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公开(公告)号：ITRM960870A1
公开(公告)日：1998-06-16
申请号：ITRM960870
申请日：1996-12-16
Applicant: MOTOROLA INC
Inventor： OTTING MARCIA J , JOHNSON JR ROBERT M
Abstract: An apparatus (304) for scanning among a plurality of channels in a radio communication system (300) includes receive circuitry (310) and control circuitry (312). The receive circuitry (310) is capable of being tuned to any one of the plurality of channels and measures reception strength of the tuned channel. The control circuitry (312) controls the receive circuitry (310) to scan through all of the plurality of channels one at a time. The control circuitry (312) stores a first reading of a measured reception strength of the tuned channel before powering off the receive circuitry (310). The control circuitry (312) stores a second reading of a measured reception strength of the tuned channel after powering the receive circuitry (310) back on.
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公开(公告)号：GB2317510A
公开(公告)日：1998-03-25
申请号：GB9717447
申请日：1997-08-18
Applicant: MOTOROLA INC
Inventor： JOHNSON JR ROBERT M , MONEFAX J GILOT
Abstract: A battery charger calculates the slope or rate of change of battery temperature and stores a peak rate of change value PK, which is updated as charging continues, 208. Charging is interrupted, 216, when the present rate of change of temperature RSnow has fallen from the currently stored peak value PK by at least a first threshold value, provided that the present battery temperature Tnow exceeds an initial or ambient temperature value To by at least a second threshold value. The battery temperature slope may be calculated by subtracting the sum of three consecutive old temperature measurements from the sum of the three most recent temperature measurements. This provides noise immunity and also allows use of a low cost analog/digital converter in a microprocessor (140, Fig. 1). The charger may be incorporated in a cellular radio telephone having a microprocessor which controls call processing and also controls battery charging. The battery may be charged at an intermediate rate (less than fast charge, greater than trickle charge) - eg. at a C/3 rate of 300mA.
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公开(公告)号：GB2294602A
公开(公告)日：1996-05-01
申请号：GB9526296
申请日：1995-02-23
Applicant: MOTOROLA INC
Inventor： DUONG MINH HOANG , DORSEY DONALD A , JOHNSON JR ROBERT M
Abstract: A receiver (100) has a channel scan mode of operation and a communication mode of operation. In the channel mode of operation, the passband of a filter (145, 144) is narrowed relative to the passband of the filter in the communication mode. According to another aspect of the circuit, a local oscillator (112, 142, 157) is selectively phase locked to an internal clock (137) during channel scanning and locked to the incoming signal during a communication mode operation.
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