Common mixer methods and circuits in mobile communication devices
First Claim
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1. In a circuit, a method for converting a GPS (Global Positioning System) signal and a non-GPS RF (radio frequency) signal, said non-GPS RF signal being a non-GPS signal, to a corresponding one of a first intermediate frequency (IF) signal and a second intermediate frequency (IF) signal, comprising:
- providing a common mixer that is coupled to receive as inputs a GPS-derived signal that is derived from said GPS signal and a RF-derived signal that is derived from said non-GPS RF signal;
providing a first local oscillator signal having a first frequency and a second oscillator signal having a second frequency to said common mixer; and
producing said first IF signal using said common mixer from said GPS-derived signal and said first oscillator signal when said circuit operates in a GPS mode and a second IF signal using said common mixer from said RF-derived signal and said second local oscillator signal when said circuit operates in a non-GPS RF signal mode,wherein said first IF signal and said second IF signal are simultaneously produced, said method further including selecting, using a first filter, said first IF signal for use by GPS processing circuitry and said second IF signal for use by RF signal processing circuitry.
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Abstract
GPS functionality is added to a wireless communication device in an efficient and cost effective manner. Disclosed is a wireless communications device that has a common mixer constructed to be used for a GPS signal and another signal, a common IF filter constructed to be used for a GPS signal and another signal, in addition to other cost effective embodiments.
19 Citations
15 Claims
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1. In a circuit, a method for converting a GPS (Global Positioning System) signal and a non-GPS RF (radio frequency) signal, said non-GPS RF signal being a non-GPS signal, to a corresponding one of a first intermediate frequency (IF) signal and a second intermediate frequency (IF) signal, comprising:
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providing a common mixer that is coupled to receive as inputs a GPS-derived signal that is derived from said GPS signal and a RF-derived signal that is derived from said non-GPS RF signal; providing a first local oscillator signal having a first frequency and a second oscillator signal having a second frequency to said common mixer; and producing said first IF signal using said common mixer from said GPS-derived signal and said first oscillator signal when said circuit operates in a GPS mode and a second IF signal using said common mixer from said RF-derived signal and said second local oscillator signal when said circuit operates in a non-GPS RF signal mode, wherein said first IF signal and said second IF signal are simultaneously produced, said method further including selecting, using a first filter, said first IF signal for use by GPS processing circuitry and said second IF signal for use by RF signal processing circuitry. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A circuit for converting a GPS signal and a non-GPS RF signal to one of a first intermediate frequency (IF) signal and a second intermediate frequency (IF) signal, comprising:
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a common mixer coupled to receive as inputs a GPS-derived signal that is derived from said GPS signal and a RF-derived signal that is derived from said non-GPS RF signal, both of said GPS-derived signal and said RF-derived signal being available as an input to said common mixer at a given point in time; an oscillator circuit for providing one of a first local oscillator signal having a first frequency and a second oscillator signal having a second frequency to said common mixer, wherein said common mixer is configured to produce said first IF signal from said GPS-derived signal and said first oscillator signal, said common mixer is configured to produce a second IF signal from said non-GPS RF signal and said second local oscillator signal, said common mixer is further configured to simultaneously produce said first IF signal and said second IF signal; and a first filter configured to to select said first IF signal for use by GPS processing circuitry and said second IF signal for use by RF signal processing circuitry. - View Dependent Claims (9, 10, 11, 12, 13)
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14. In a circuit, a method for converting a GPS (Global Positioning System) signal and a non-GPS RF (radio frequency) signal, said non-GPS RF signal being a non-GPS signal, to a corresponding one of a first intermediate frequency (IF) signal and a second intermediate frequency (IF) signal, comprising:
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providing a common mixer that is coupled to receive a mixer input signal, said mixer input signal being a GPS-derived signal that is derived from said GPS signal and a RF-derived signal that is derived from said non-GPS RF signal; providing, responsive to a control signal, a local oscillator signal having one of a first frequency and a second frequency to said common mixer; producing a mixer output signal, using said common mixer, from said local oscillator signal and said mixer input signal; and filtering said mixer output signal to produce said first IF signal if said circuit operates in a GPS mode and to produce said second IF signal if said circuit operates in a non-GPS RF mode. - View Dependent Claims (15)
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Specification