GPS RF front end IC with programmable frequency synthesizer for use in wireless phones
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Abstract
A GPS RF Front End IC containing a Programmable Frequency Synthesizer is disclosed. The GPS RF front end IC having a programmable frequency synthesizer allows a relatively fixed internal frequency plan while able to use a number of different reference frequencies provided by the host platform, which can be a wireless phone, or other such device, which can provide an accurate reference frequency signal.
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Citations
15 Claims
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1. (canceled)
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2. (canceled)
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3. (canceled)
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4. A method for integration of a GPS RF Front End with a wireless mobile, comprising the steps of:
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producing a Local Oscillator (LO) signal with a Voltage Controlled Oscillator (VCO);
dividing the LO signal by a predetermined value of a first counter means that is coupled to the VCO to obtain a second signal with a frequency of LO divided by the predetermined value and results in a second signal;
dividing the LO signal by a second predetermine value generated by a second fixed counter means that result in a third signal, where the second fixed counter means has a first divide-by-N counter having multiple outputs;
dividing one of the first divide-by-N outputs by a second divide-by-N counter; and
comparing a phase and a frequency of the outputs of a first programmable count-down counter that is coupled to the second divide-by-N counter and the second programmable count-down counter, with a Phase Frequency Signal Detector where a reference frequency is also coupled to the second programmable count-down counter. - View Dependent Claims (5, 6, 7, 8, 9)
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10. A method for integration of a GPS RF Front End with a wireless device, comprising the steps of:
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producing a oscillator signal in the wireless device;
dividing the oscillator signal by at more than one counter that results in more than one output; and
comparing the phase and frequency of the outputs with a phase frequency signal detector and results in an output oscillator signal required by the wireless device. - View Dependent Claims (11, 12, 13, 14, 15)
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Specification