GPS RF front end IC with programmable frequency synthesizer for use in wireless phones
First Claim
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1. A method for synthesizing a plurality of oscillator signals in a GPS RF Front End integrated within a wireless mobile, comprising the steps of:
- 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 predetermined 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.
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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
12 Claims
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1. A method for synthesizing a plurality of oscillator signals in a GPS RF Front End integrated within 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 predetermined 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 (2, 3, 4, 5, 6)
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7. A method for synthesizing a plurality of oscillator signals in a GPS RE Front End integrated in a wireless device, comprising the steps of:
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producing a first oscillator signal in the wireless device; dividing the frequency of the first oscillator signal in the wireless device; dividing the frequency of the first oscillator signal by more than one counter that results in more than one output used by a GPS receiver; and comparing the phase and frequency of the outputs with a phase frequency signal detector to generate an output oscillator signal used by the wireless device. - View Dependent Claims (8, 9, 10, 11, 12)
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Specification