Phase-locked loop circuit based frequency synthesis type low-noise frequency multiplier

Abstract

The invention discloses a phase-locked loop circuit based frequency synthesis type low-noise frequency multiplier. The phase-locked loop circuit based frequency synthesis type low-noise frequency multiplier is characterized by being mainly composed of a processing chip U, a phase-locked loop circuit connected with the processing chip U, a harmonic elimination circuit respectively connected with the processing chip U and the phase-locked loop circuit, a resistor R5 with one end connected with the VDD pin of the processing chip U and the other end connected with a 5V power source, a resistor R6 with one end connected with the VSS pin of the processing chip U and the other end connected with the power source, and a capacitor C3 with the positive electrode connected with the RC pin of the processing chip U and the negative electrode connected with the R pin of the processing chip U after the negative electrode is connected with a resistor R8. The phase-locked loop circuit based frequency synthesis type low-noise frequency multiplier can process the phase of a signal to enable the phase of the signal to be steadier and avoid a phase lock-loosing phenomenon of the signal in a conversion process, so that the signal stability is improved greatly. The phase-locked loop circuit based frequency synthesis type low-noise frequency multiplier can process the frequency of the signal, so that the signal resolution is improved greatly and the signal can be identified more easily.

Description

technical field [0001] The invention relates to a frequency multiplier, in particular to a frequency synthesis type low-noise frequency multiplier based on a phase-locked loop circuit. Background technique [0002] With the continuous development of electronic technology, frequency multipliers are used more and more widely. For example, the transmitter can make the main oscillator oscillate at a lower frequency to improve frequency stability; Large frequency offset; in the phase keying communication machine, the frequency multiplier is an important component of the carrier recovery circuit. It can be seen that the frequency multiplier plays an important role in the process of industrial production. However, the currently used frequency multiplier generates a large number of harmonics, which makes the phase of the output signal unstable, resulting in excessive noise of the frequency multiplier. Moreover, the higher the number of frequency multiplications, the greater the fr...

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to overcome the defect of excessive noise of the current frequency multiplier, and provide a frequency synthesis type low-noise frequency multiplier based on a phase-locked loop circuit

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