Generating a frequency switching local oscillator signal
First Claim
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1. A method of generating a frequency switching local oscillator signal, comprising:
- generating a reference clock signal;
clocking a counter with the reference clock signal;
the counter controlling cyclical selection of a one of a plurality of analog values stored in a periodic signal generator, the cyclical selection producing a periodic signal at an output of the periodic signal generator;
controlling a frequency of the periodic signal at the output of the periodic signal generator by controlling an order of the cyclical selection of the plurality of analog values stored in the periodic signal generator;
generating the frequency switching local oscillator signal based on the periodic signal;
whereincontrolling the order of cyclic selection comprises directing each of a different plurality of subsets of counter bits to switch control lines of the periodic signal generator, and choosing one counter bit from each of the subsets.
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Abstract
Methods and systems of generating a frequency switching local oscillator signal are disclosed. One method includes generating a reference clock signal, and clocking a counter with the reference clock signal. The counter controls selection of a one of a plurality of analog values stored in at least one of a plurality of periodic signal generators. The frequency switching local oscillator signal is generated by selecting an output of a one of the plurality of periodic signal generators.
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Citations
23 Claims
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1. A method of generating a frequency switching local oscillator signal, comprising:
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generating a reference clock signal; clocking a counter with the reference clock signal; the counter controlling cyclical selection of a one of a plurality of analog values stored in a periodic signal generator, the cyclical selection producing a periodic signal at an output of the periodic signal generator; controlling a frequency of the periodic signal at the output of the periodic signal generator by controlling an order of the cyclical selection of the plurality of analog values stored in the periodic signal generator; generating the frequency switching local oscillator signal based on the periodic signal;
whereincontrolling the order of cyclic selection comprises directing each of a different plurality of subsets of counter bits to switch control lines of the periodic signal generator, and choosing one counter bit from each of the subsets. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A method of generating a frequency switching local oscillator signal, comprising:
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generating a reference clock signal; clocking a counter with the reference clock signal; the counter controlling cyclical selection of a one of a plurality of analog values stored in at least one of a plurality of periodic signal generators, the cyclical selection producing a periodic signal at an output of the at least one of the plurality of periodic signal generators; generating a frequency switching local oscillator signal by selecting the output signal of the at least one of the plurality of periodic signal generators; and further comprising the at least one of the plurality of periodic signal generators storing N/2 samples of N samples of one period of a periodic signal, and generating the N samples of the periodic signal by the counter controlling selection of the stored values in an appropriate order and inverting every other repetition of the N/2 samples. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20, 21, 22)
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23. A frequency switching local oscillator, comprising:
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a fixed-frequency reference clock for providing a clock reference signal; a counter, the counter receiving the reference signal, and controlling cyclical selection of a one of a plurality of analog values stored in a periodic signal generators, the cyclical selection producing a periodic signal at an output of the periodic signal generators, the periodic signal generator storing N/4 samples of N samples of one period of the periodic signal, and generating the N samples of the periodic signal by the counter controlling selection of the stored values in an appropriate order and inverting every other repetition of N/2 samples; means for controlling a frequency of the periodic signal at the output of the periodic signal generator by controlling an order of the selection of the plurality of analog values stored in the periodic signal generators; means for generating a frequency switching local oscillator signal based on the periodic signal.
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Specification