High-frequency broadband voltage-controlled oscillator and operation method thereof

Abstract

The present invention relates to a high-frequency broadband voltage-controlled oscillator and an operation method thereof. The high-frequency broadband voltage-controlled oscillator comprises an inputbuffer unit, a resonance unit, an output buffer unit, a negative resistance unit and a tail current source unit. The operation method comprises the steps of accessing a control voltage to the input buffer unit, and transmitting a voltage signal to the resonance unit; generating an oscillating signal according to the voltage signal by the resonance unit, and transmitting the oscillating signal tothe output buffer unit; buffering the oscillating signal by the output buffer unit and outputting the oscillating signal; compensating the loss of the resonance unit by the energy of the negative resistance generated by the negative resistance unit; and generating a working current by the tail current source unit. In this way, the secondary harmonic component of the current generated in the resonance circuit is prevented from entering the ground, and the even harmonic and the surrounding noise are inhibited. Compared with the prior art, the oscillation frequency and the output amplitude are improved, and the phase noise and the even harmonic noise are reduced. The precision of a current source is improved and the performance requirements of a millimeter wave frequency band signal source are met.

Description

technical field [0001] The invention relates to the technical field of oscillators, in particular to a high-frequency broadband voltage-controlled oscillator and an operating method thereof. Background technique [0002] With the rapid development of wireless communication technology and the continuous improvement of people's demand for communication, wireless communication technology applied to millimeter waves has become a research hotspot in recent years. Therefore, as the core module of the transceiver in wireless communication, the phase-locked loop frequency synthesizer directly affects the performance of the entire system, and the voltage-controlled oscillator is the core circuit of the phase-locked loop frequency synthesizer; [0003] A voltage-controlled oscillator (VCO, voltage-controlled oscillator) refers to an oscillating circuit whose output frequency corresponds to an input control voltage. At present, there are mainly two implementation forms of voltage-cont...

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Problems solved by technology

[0008] The purpose of the present invention is to provide a high-frequency broadband voltage-controlled oscillator and its operation method. The technical problem to be solved is: the phase noise in the high-frequency band is relatively poor, and the output amplitude is low, which is far from meeting the requirements in the millimeter-wave frequency band. Performance requirements on

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