Class-F voltage-controlled oscillator

Abstract

The invention belongs to the technical field of wireless communication, and relates to a voltage-controlled oscillator (VCO) in a phase-locked loop, in particular to a Class-F voltage-controlled oscillator. The oscillator comprises a first resonant cavity, a cross coupling tube pair and a second resonant cavity, the first resonant cavity resonates at omega1, and the second resonant cavity resonates at 3omega1; that is to say, two separated inductors are adopted to form two resonant cavities, third harmonics and fundamental waves are separated, and a waveform similar to square waves is still formed at the drain electrode and the source electrode of the cross coupling tube. Moreover, the two resonant cavities replace a transformer structure, thereby avoiding repeated adjustment of the size of the transformer to ensure the performance requirements of the circuit, greatly simplifying the design process, and enabling the actual design to be more convenient. Meanwhile, a tail current sourceand a filter capacitor are removed, so that the circuit structure is simpler, and the problem of phase noise deterioration caused by the tail current source and the filter capacitor in the circuit iseffectively avoided.

Description

technical field [0001] The invention belongs to the technical field of wireless communication, and relates to a voltage-controlled oscillator (VCO) in a phase-locked loop, in particular to a Class-F voltage-controlled oscillator. Background technique [0002] As an important part of wireless communication technology, the phase-locked loop has higher and higher requirements with the rapid development of wireless communication technology; the voltage-controlled oscillator (VCO), as the key circuit of the phase-locked loop, its performance is the most concerned issue; among them, the most important performance indicators are the phase noise and power consumption of the VCO. [0003] In order to improve the phase noise performance of VCOs, researchers have proposed many new structures. The traditional Class-F voltage-controlled oscillator passes through a transformer with a moderately coupled resonant winding to increase the third harmonic of the basic oscillation voltage to ob...

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Problems solved by technology

[0007] The purpose of the present invention is to provide a novel Class-F voltage-controlled oscillator for the shortcomings of the above-mentioned traditional Class-F voltage-controlled oscillator; the present invention adopts the design of two separate inductors to form two resonant cavities, which reduces the design Difficulty, and removed the tail current source and filter capacitor, there is no problem of deterioration of the above-mentioned phase noise

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