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Frequency adjusting method of oscillator and decimal fraction frequency dividing phase-locked loop frequency synthesizer

A frequency synthesizer and frequency adjustment technology, applied in the direction of automatic power control, electrical components, etc., can solve the problem of long time for VCO frequency adjustment, achieve the effect of effectively approximating the target value at high speed and speeding up the self-calibration process

Inactive Publication Date: 2008-09-03
TIANJIN LANGBO MICROELECTRONICS
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  • Abstract
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  • Application Information

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Problems solved by technology

[0006] The purpose of the present invention is to solve the problem that the frequency adjustment time of the VCO is longer in the existing fractional frequency division phase-locked loop frequency synthesizer, propose a method for adjusting the frequency of the oscillator in the phase-locked loop frequency synthesizer and adopt the adjustment Method of Fractional Phase-Locked Loop Frequency Synthesizer

Method used

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  • Frequency adjusting method of oscillator and decimal fraction frequency dividing phase-locked loop frequency synthesizer
  • Frequency adjusting method of oscillator and decimal fraction frequency dividing phase-locked loop frequency synthesizer
  • Frequency adjusting method of oscillator and decimal fraction frequency dividing phase-locked loop frequency synthesizer

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Embodiment Construction

[0019] Below in conjunction with accompanying drawing and example further illustrate the present invention.

[0020] figure 1 Shown is a system composition of a voltage-controlled oscillator with a switched capacitor array and a fractional frequency phase-locked loop frequency synthesizer with frequency self-calibration function. The fine-tuning mechanism of the analog phase-locked loop includes a phase-frequency detector, a charge pump, a loop filter, a voltage-controlled oscillator VCO with a switched capacitor array, a frequency divider, a frequency-division modulator and a reference frequency generation circuit, wherein , the frequency and phase detector, charge pump, loop filter, voltage controlled oscillator and frequency divider are connected in turn to form a loop, and the reference frequency is input into the frequency and phase detector; the frequency division modulator and The frequency dividers are connected so that the frequency divider is controlled by the freq...

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Abstract

The invention discloses a frequency adjustment method of oscillator and a decimal frequency dividing phase-locked loop frequency synthesizer which comprises a digital frequency range rough adjusting mechanism and a simulate frequency fine adjusting mechanism. A binary search method is used in the process of digital frequency range rough adjusting, which gradually enhances the frequency comparative accuracy when reducing the adjusting step length, thus accelerating the self-alignment.

Description

technical field [0001] The invention relates to the field of radio frequency microwave communication, in particular to a frequency adjustment method of a phase-locked loop frequency synthesizer and an oscillator thereof. Background technique [0002] In RF microwave transceivers, phase-locked loop frequency synthesizers are often required to generate stable frequencies. In the prior art, a combination of coarse tuning and fine tuning is often used to lock the output frequency of an oscillator (VCO) in a phase-locked loop frequency synthesizer to a reference frequency. For example, US Pat. No. 6,597,249 discloses a method for adjusting a phase-locked loop frequency synthesizer. as in US 6,597,249 image 3 As shown, the phase-locked loop frequency synthesizer includes a digital coarse tuning module 10 and an analog phase-locked loop fine-tuning mechanism, and the VCO frequency divider 16 of the analog phase-locked loop fine-tuning mechanism has 2 n separate frequencies. Whe...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03L7/099H03L7/113H03L7/199
Inventor 孙卫罡马槐楠王文申
Owner TIANJIN LANGBO MICROELECTRONICS