Radio communication apparatus having a battery saving function
First Claim
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1. A radio communication apparatus intermittently powered in synchronism with radio frequency signals transmitted from a base station, comprising:
- a receiver for receiving radio frequency signals intermittently transmitted from a base station, said receiver comprising a local oscillator for generating oscillation signals having a first frequency and a signal processor for processing the received radio frequency signals and the oscillation signals to produce processed signals, wherein said local oscillator comprises a synthesizer including a phase locked loop and an oscillator circuit coupled to said phase locked loop;
power supply means for supplying power to said receiver;
controlling means for controlling said power supply means to supply power to said local oscillator at a first predetermined time before the radio frequency signals are received and to supply power to said signal processor at a second predetermined time after the first predetermined time, wherein said controlling means controls said power supply means to supply power to said phase locked loop at said first predetermined time and to further supply power to said oscillator circuit at a third predetermined time after said first predetermined time;
a demodulator coupled to said signal processor for demodulating the processed signals to produce demodulated signals;
a memory device for storing an identification code;
comparing means, coupled to said demodulator and said memory device, for comparing an identification code included in the demodulated signals and the identification code stored in said memory device; and
an indicator responsive to said comparing means for indicating if the identification code in the demodulated signals matches the identification code stored in said memory device.
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Abstract
A radio communication apparatus intermittently powered in synchronism with an intermittent reception control signal transmitted from a base station is disclosed. The apparatus includes a synthesizer, wherein power supplied to the synthesizer is initiated prior to the power supply to circuits other than the synthesizer.
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Citations
46 Claims
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1. A radio communication apparatus intermittently powered in synchronism with radio frequency signals transmitted from a base station, comprising:
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a receiver for receiving radio frequency signals intermittently transmitted from a base station, said receiver comprising a local oscillator for generating oscillation signals having a first frequency and a signal processor for processing the received radio frequency signals and the oscillation signals to produce processed signals, wherein said local oscillator comprises a synthesizer including a phase locked loop and an oscillator circuit coupled to said phase locked loop; power supply means for supplying power to said receiver; controlling means for controlling said power supply means to supply power to said local oscillator at a first predetermined time before the radio frequency signals are received and to supply power to said signal processor at a second predetermined time after the first predetermined time, wherein said controlling means controls said power supply means to supply power to said phase locked loop at said first predetermined time and to further supply power to said oscillator circuit at a third predetermined time after said first predetermined time; a demodulator coupled to said signal processor for demodulating the processed signals to produce demodulated signals; a memory device for storing an identification code; comparing means, coupled to said demodulator and said memory device, for comparing an identification code included in the demodulated signals and the identification code stored in said memory device; and an indicator responsive to said comparing means for indicating if the identification code in the demodulated signals matches the identification code stored in said memory device. - View Dependent Claims (2)
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3. A radio communication apparatus intermittently powered in synchronism with radio frequency signals transmitted from a base station, comprising:
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a receiver for receiving radio frequency signals intermittently transmitted from a base station, said receiver comprising a local oscillator for generating oscillation signals having a first frequency and a signal processor for processing the received radio frequency signals and the oscillation signals to produce processed signals, wherein said local oscillator comprises a phase locked loop and an oscillator circuit coupled to said phase locked loop; power supply means for supplying power to said receiver, wherein said power supply means comprises a battery and a power source circuit for supplying power from said battery to said receiver; controlling means for controlling said power supply means to supply power to said receiver, wherein said controlling means comprises; (a) a switch connected between said power source circuit and said signal processor; and (b) a controller, coupled to said power source circuit and said switch, for controlling said power source circuit to supply power to said phase locked loop at a first predetermined time before the radio frequency signals are received, for closing said switch to supply power to said signal processor at a second predetermined time after the first predetermined time, and for controlling said power source circuit to supply power to said oscillator circuit at a third predetermined time after said first predetermined time; a demodulator coupled to said signal processor for demodulating the processed signals to produce demodulated signals; a memory device for storing an identification code; comparing means, coupled to said demodulator and said memory device, for comparing an identification code included in the demodulated signals and the identification code stored in said memory device; and an indicator, responsive to said comparing means, for indicating if the identification code in the demodulated signals matches the identification code stored in said memory device. - View Dependent Claims (4, 5, 6, 7, 8, 9, 10)
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11. A radio communication apparatus intermittently powered in synchronism with radio frequency signals transmitted from a base station, comprising:
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a receiver for receiving radio frequency signals intermittently transmitted from a base station, said receiver comprising a radio frequency amplifier for amplifying the receiver radio frequency signal, a local oscillator for generating oscillation signals having a first frequency, and a signal processor for processing the amplified radio frequency signals and the oscillation signals to produce processed signals, said signal processor comprising; (a) a first bandpass filter, coupled to said radio frequency amplifier, for filtering the amplified radio frequency signals; (b) a first mixer, coupled to said first bandpass filter and to said local oscillator, for mixing the filtered signals and said oscillation signals having a first frequency to produce first baseband signals; (c) a phase shifter coupled to said local oscillator for shifting the phase of said oscillation signals having a first frequency by a predetermined angle; (d) a second mixer, coupled to said first bandpass filter and to said phase shifter, for mixing the filtered signals and the phase shifted oscillation signals to produce second baseband signals; (e) a second bandpass filter, coupled to said first and second mixer, for filtering the first and second baseband signals; and (f) a limited coupled to said second bandpass filter for limiting the first and second filtered baseband signals to produce the processed signals; a power supply for supplying power to said receiver, said power supply comprising a battery and a power source circuit coupled for supplying power from said battery to said receiver; controlling means for controlling said power supply to supply power to said local oscillator at a first predetermined time before the radio frequency signals are received and to supply power to said signal processor at a second predetermined time after the first predetermined time; a demodulator coupled to said signal processor for demodulating the processed signals; a memory device for storing an identification code; comparing means, coupled to said demodulator and said memory device, for comparing an identification code included in said demodulated signal and the identification code stored in said memory device; and an indicator responsive to said comparing means for indicating if the identification code in the demodulated signal matches the identification code stored in said memory device. - View Dependent Claims (12, 13, 14, 15, 16, 17)
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18. A radio communication apparatus intermittently powered in synchronism with radio frequency Signals transmitted from a base station, comprising;
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a receiver for receiving radio frequency signals intermittently transmitted from a base station, said receiver comprising; (a) a radio frequency amplifier for amplifying the received radio frequency signals; (b) a local oscillator having a phase locked loop integrated circuit and an oscillator circuit coupled to said phase locked loop integrated circuit for outputting oscillation signals having a first frequency; and (c) a signal processor for processing the amplified radio frequency signals and the oscillation signals having the first frequency to produce processed signals, said signal processor including a receiver integrated circuit coupled to said oscillator circuit; a power supply for supplying power to said receiver, said power supply comprising a battery and a power source circuit coupled for supplying power from said battery to said receiver; controlling means for controlling said power supply to supply power to said local oscillator at a first predetermined time before the radio frequency signals are received and to supply power to said signal processor at a second predetermined time after the first predetermined time; a demodulator coupled to said signal processor for demodulating the processed signals; a memory device for storing an identification code; comparing means, coupled to said demodulator and said memory device, for comparing an identification code included in said demodulated signal and the identification code stored in said memory device; and an indicator responsive to said comparing means for indicating if the identification code in the baseband signal matches the identification code stored in said memory device. - View Dependent Claims (19, 20, 21, 22, 23, 24, 25, 26, 27, 28)
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29. A radio communication apparatus intermittently powered in synchronism with radio frequency signals transmitted from a base station, comprising:
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a synthesizer circuit for generating oscillation signals; a receiver circuit, coupled to said synthesizer circuit, for receiving radio frequency signals transmitted from a base station and for converting the received radio frequency signals into baseband signals using the oscillation signals; a memory device for storing an identification code; a controller for comparing an identification code in the baseband signals to the identification code stored in said memory device and for generating power control signals; an indicator, coupled to said controller, for providing an indication to a user if the identification code in the baseband signals matches the identification code stored in said memory device; a battery; and power source circuitry, responsive to the power control signals, for supplying power from said battery to a first portion of said synthesizer circuit at a first predetermined time, to a second portion of said synthesizer circuit at a second predetermined time after the first predetermined time, and to said receiver circuit at a third predetermined time after the second predetermined time. - View Dependent Claims (30, 31, 32, 33, 34)
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35. A radio communication apparatus intermittently powered in synchronism with radio frequency signals transmitted from a base station, comprising:
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a synthesizer circuit for generating oscillation signals; a receiver circuit, coupled to said synthesizer circuit, for receiving radio frequency signals transmitted from a base station and for converting the received radio frequency signals into baseband signals using the oscillation signals; a memory device for storing an identification code; a controller for comparing an identification code in the baseband signals to the identification code stored in said memory device and for generating a plurality of power control signals; an indicator, coupled to said controller, for providing an indication to a user if the identification code in the baseband signals matches the identification code stored in said memory device; a battery; and a power source circuit for supplying power from said battery to said synthesizer circuit at a first predetermined time and to said receiver circuit at a second predetermined time, wherein said power source circuit includes (1) a DC/DC converter, coupled to said battery, for converting a battery voltage to a converter output voltage responsive to a first power control signal from said controller, and (2) a regulator integrated circuit for converting the battery voltage to a first regulator voltage responsive to a second power control signal from said controller and for converting the converter output voltage to a second regulator voltage responsive to a third power control signal from said controller, the first regulator voltage being supplied to a portion of said synthesizer circuit at the first predetermined time and the second regulator voltage being supplied to said receiver circuit at the second predetermined time. - View Dependent Claims (36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46)
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Specification