OSCILLATORS HAVING ARBITRARY FREQUENCIES AND RELATED SYSTEMS AND METHODS
First Claim
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1. A method comprising:
- downconverting a cellular telephone signal, the cellular telephone signal modulated with data, using an oscillating reference signal having an arbitrary frequency to generate a downconverted signal including the data; and
sampling the downconverted signal with an analog-to-digital converter (ADC) using a sampling rate selected to induce a shift of the data of the downconverted signal in a frequency domain.
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Abstract
Systems and methods for operating with oscillators configured to produce an oscillating signal having an arbitrary frequency are described. The frequency of the oscillating signal may be shifted to remove its arbitrary nature by application of multiple tuning signals or values to the oscillator. Alternatively, the arbitrary frequency may be accommodated by adjusting operation one or more components of a circuit receiving the oscillating signal.
63 Citations
24 Claims
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1. A method comprising:
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downconverting a cellular telephone signal, the cellular telephone signal modulated with data, using an oscillating reference signal having an arbitrary frequency to generate a downconverted signal including the data; and sampling the downconverted signal with an analog-to-digital converter (ADC) using a sampling rate selected to induce a shift of the data of the downconverted signal in a frequency domain. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A method comprising:
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generating a digital data signal having digital data; sampling the digital data signal with a digital-to-analog converter (DAC) using a sampling rate selected to induce a shift of the digital data in a frequency domain, the sampling resulting in an analog signal; and upconverting the analog signal using an oscillating reference signal having an arbitrary frequency to generate an upconverted signal including data corresponding to the digital data.
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10. A method comprising:
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downconverting a first signal, the first signal modulated with data, using an oscillating reference signal having an arbitrary frequency to generate a downconverted signal including the data; sampling the downconverted signal with an analog-to-digital converter (ADC) to produce a digital signal including digital data corresponding to the data; and shifting, using a digital signal processor (DSP), the digital data in a frequency domain. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18, 19)
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20. A method comprising:
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generating a digital data signal having digital data; shifting the digital data in a frequency domain using a digital signal processor (DSP); sampling the shifted digital data with a digital-to-analog converter (DAC) to produce an analog signal; and upconverting the analog signal using an oscillating reference signal having an arbitrary frequency to generate an upconverted signal including data corresponding to the digital data, wherein shifting the digital data in the frequency domain comprises shifting the digital data by a frequency amount selected to account for a deviation of the arbitrary frequency from a standard oscillator frequency.
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21. A method comprising:
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downconverting a first signal, the first signal modulated with analog data, using an oscillating reference signal having an arbitrary frequency to generate a downconverted signal including the analog data, the arbitrary frequency differing from a standard oscillator frequency; sampling the downconverted signal with an analog-to-digital converter (ADC) to produce a digital signal including digital data corresponding to the analog data, the sampling being performed using a sampling rate corresponding to the standard oscillator frequency; and applying the digital signal to a carrier tracking loop. - View Dependent Claims (22, 23, 24)
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Specification