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Frequency modulator for directly modulating VCO and modulating method

A technology of voltage-controlled oscillation and frequency modulation, applied in the field of digital communication, can solve problems such as difficult compensation and matching

Inactive Publication Date: 2006-02-08
曹伟勋
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although the method is well proven in theory, it is difficult to achieve precise compensation matching in practice

Method used

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  • Frequency modulator for directly modulating VCO and modulating method
  • Frequency modulator for directly modulating VCO and modulating method
  • Frequency modulator for directly modulating VCO and modulating method

Examples

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Embodiment Construction

[0064] The following design examples specifically describe the principles involved in the present invention, functional modules and signal flow. These descriptions are mainly to explain the basic principles of the present invention more directly and clearly, so they only represent an application related to the present invention , and the present invention is not limited to this application.

[0065] refer to figure 1 , the numbers in the figure indicate the numbers of different modules. figure 1 It is a fractional-N frequency synthesizer. The baseband digital signal D_in is sent to the transmit filter 107 to generate a modulation signal, and the modulation signal and the carrier signal Freq_Carrier are superimposed by the adder 106 as the input of the Sigma-Delta modulator 105, and the output of the Sigma-Delta modulator 105 is used for The frequency division ratio of the dual-mode frequency divider 104 is controlled. A detailed description of the Sigma-Delta modulator can ...

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Abstract

Disclosed is a frequency modulator and method for directly modulating voltage-controlled oscillator (VCO) with self-adapting gain control. The invention exploits double-point modulation structure to control the input of VCO; and exploits the property of phase-lock loop to the narrow band tracking property of VCO to get carrier wave signal; getting frequency modulation signal by modulating VCO with digital self-adapting gain control loop. The inventive structure has the advantages of exploiting phase-lock loop frequency synthesizer to getting carrier wave frequency, and of be able to modulating high speed wide band input signal.

Description

technical field [0001] The invention belongs to the technical field of digital communication, specifically, the invention relates to a digital frequency modulator and a modulation method required in high-speed data transmission. This frequency modulator adopts adaptive digital control processing technology, which can perform frequency synthesis and modulation for various transmission modes and transmission channels. Background technique [0002] With the continuous development of wireless communication technology, higher and higher requirements are put forward for the frequency stability, spectrum purity, frequency range and the number of output frequencies of the frequency source. In order to improve frequency stability, methods such as crystal oscillators are often used to solve the problem, but it cannot meet the requirements of a large number of frequencies. Therefore, a large number of frequency synthesis techniques are currently used. By adding, subtracting, multiplyi...

Claims

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Application Information

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IPC IPC(8): H03L7/08H03L7/18H04L27/152H04L7/033
Inventor 曹伟勋
Owner 曹伟勋
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