Digital frequency source generator

Abstract

The invention discloses a digital frequency source generator, aims at providing the digital frequency source generator capable of enhancing frequency source stability and rapidly locking the frequency source, and solves the problems of instable frequency source output and slow locking. The key points of the technical scheme are that a voltage control oscillator is coupled with a preset voltage module. The preset voltage module comprises a digital-to-analog converter and a single-chip microcomputer. The single-chip microcomputer is used for providing digital driving signals. The digital-to-analog converter is coupled with the single-chip microcomputer and used for receiving the digital driving signals and outputting analog voltage signals. The voltage control oscillator is coupled with the digital-to-analog converter and used for receiving the analog voltage signals for generating the initial frequency source in advance. The input end of the voltage control oscillator is also coupled with a voltage buffering module which is used for absorbing voltage spike. The effects of stable frequency source output, rapid locking and convenient adjustment can be achieved. The digital frequency source generator is suitable for the technical field of wireless communication.

Description

technical field [0001] The present invention relates to a technical field of wireless communication, more specifically, it relates to a digital frequency source generator. Background technique [0002] Frequency sources are the basic signal sources of electronic systems (radar, communication, measurement and control, navigation, etc.), mainly including fixed point frequency frequency sources and synthetic frequency sources. Synthetic frequency sources are also called frequency synthesizers or frequency synthesizers, and can be divided into direct and indirect according to their composition. [0003] The indirect frequency synthesizer uses the phase-locked loop (PLL) technology, which is currently the most widely used. The circuit used in this synthesis method is a closed-loop system that achieves phase feedback control through phase detection to achieve frequency tracking. With the development of semiconductor technology, the digital frequency source generator is also deve...

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Problems solved by technology

[0009] Furthermore, the existing technology uses a combination of a phase-locked loop and a digital circuit to improve the digital frequency source generator, and there are many switching elements in the digital circuit, and it is a good idea to adjust the voltage-controlled oscillator (VCO) through the switching elements. A good method, but there is a problem that is difficult to solve when the switching element is adjusting the voltage-controlled oscillator (VCO), that is, the frequency source is unstable when the digital frequency source generator is powered on. The reason is analyzed and The research found that because the switching elements are constantly alternately turned on and off, which has a great impact on the voltage-controlled oscillator (VCO), so the development of the digital circuit solution is hindered, and a new solution is needed to solve the above problems.

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