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Frequency generation techniques

A frequency and reference frequency technology, applied in the field of frequency generation, can solve problems such as interference performance and degradation

Inactive Publication Date: 2010-06-02
INTEL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, if the desired synthesized frequency is close to a harmonic of the crystal oscillator frequency, glitches can cause problems such as interference and performance degradation

Method used

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  • Frequency generation techniques
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Embodiment Construction

[0016] Embodiments provide techniques for the generation of signals at specific frequencies. For example, embodiments provide for reducing unwanted spurious output in a synthesizer. This can be obtained by a priori knowledge of which combinations of frequency multiplier values ​​and first frequency values ​​(eg crystal oscillator frequency) result in the desired output frequency with reduced spurious output. Thus, embodiments may advantageously allow less complex synthesizer implementations that achieve better performance (eg, reduced spurious output).

[0017] As one example, a device may include an oscillator module, a synthesizer module, and a control module. The oscillator module generates an oscillator signal having a first frequency. A synthesizer module generates an output signal having a second frequency from the oscillator signal. A frequency multiplier corresponds to the first frequency and the second frequency. The control module selects the first frequency and ...

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Abstract

The invention provides frequency generation techniques. Techniques involving the generation of signals at particular frequencies are disclosed. For instance, an apparatus may include an oscillator module, a synthesizer module, and a control module. The oscillator module produces an oscillator signal having a first frequency. From the oscillator signal, the synthesizer module produces an output signal having a second frequency. A frequency multiplier corresponds to the first and second frequencies. The control module selects the first frequency and the frequency multiplier such that a difference between the second frequency and a nearest integer multiple of the first frequency is greater than a predetermined threshold. As a result, reductions in spurious outputs may be achieved.

Description

technical field [0001] The present invention relates to frequency generation technology. Background technique [0002] Many devices, such as tuners, receivers, transmitters, upconverters, downconverters, etc., require the generation of an oscillator signal with a precise frequency. A synthesizer, which typically includes a voltage controlled oscillator (VCO), generates an output signal at a desired frequency. For example, a fractional-N synthesizer generates an output signal with a frequency expressed as an integer number of reference frequencies plus a zero number of the reference frequency. The reference frequency is usually provided by a crystal oscillator. Therefore, fractional-N synthesizers are often employed due to their ability to generate very fine frequency steps, and to obtain low phase noise performance. [0003] However, under certain conditions (such as when the VCO, crystal oscillator reference, and other logic are implemented on a single die), unwanted int...

Claims

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Application Information

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IPC IPC(8): H03L7/08
CPCH03L7/183
Inventor C·L·佩里A·J·马丁R·J·萨尔特
Owner INTEL CORP