System and method for effectively utilizing output frequency of voltage-controlled oscillator

Abstract

The invention relates to the field of oscillators and discloses a system and method for effectively utilizing the output frequency of a voltage-controlled oscillator. The system for effectively utilizing the output frequency of the voltage-controlled oscillator comprises a low-pass filter used for filtering a higher harmonic component of the output frequency; a phase discriminator used for realizing synchronous phase reference of the output frequency and input reference signal frequency; a loop filter used for filtering phase discrimination stray; and a high-pass filter used for filtering a lower harmonic component of the output frequency, wherein the voltage-controlled oscillator, the low-pass filter, the phase discriminator and the loop filter are connected in sequence to form a closed loop; and an output end of the voltage-controlled oscillator is further connected with an input end of the high-pass filter. By adoption of the system and method for effectively utilizing the output frequency of the voltage-controlled oscillator, the second harmonic and the fundamental wave can be used at the same time without affecting the circuit performance, and meanwhile, the fundamental frequency of the VCO can be reduced, the frequency division ratio can be reduced, and the working frequency of the circuit can be effectively improved.

Description

technical field [0001] The present invention relates to an oscillator, in particular to a system for effectively utilizing the output frequency of a voltage-controlled oscillator and a frequency output method using the system. Background technique [0002] In most cases, the voltage-controlled oscillator (VCO) in the microwave field needs to be phase-locked to keep the output phase of the VCO stable. We usually perform phase-locking, that is, low-pass filter the output of the VCO first, filter out the second and above harmonic components, take out the fundamental wave signal, and then divide the power into two channels, and send one to the phase detector for phase-locking. Another amplified output or frequency multiplier output, etc. [0003] However, the working efficiency of the circuit in the above manner is relatively low. Contents of the invention [0004] The purpose of the present invention is to provide a system for effectively utilizing the output frequency of a...

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Problems solved by technology

[0003] However, the circuit efficiency of the above-mentioned way is low

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