Multi-phase voltage control oscillator

Abstract

A multi-phase voltage-controlled oscillator, which includes at least one ring oscillator unit and a resistance ring, the ring oscillator unit is formed by a plurality of phase delay components connected in series, and the resistance ring is formed by a plurality of resistance components connected in series The series connection node in each ring oscillation unit is electrically connected to the series connection node in the resistance ring, so that the ring oscillation unit can generate multiple oscillation signals with uniform phase difference.

Description

technical field [0001] The invention relates to a voltage-controlled oscillator, in particular to a multi-phase voltage-controlled oscillator. Background technique [0002] At present, multiphase voltage-controlled oscillators (VCOs) have been widely used in data-recovery systems and phase-locked loops (PLLs) circuits, which can control the magnitude of an applied voltage to output multiple Oscillating signals of different frequencies but different phases, where the frequency of each oscillating signal is proportional to the magnitude of the applied voltage. Ideally, the phases of the signals output by the multi-phase voltage controlled oscillator are evenly distributed in the phase angle range of 360 degrees, so as to achieve the best control in its application. [0003] A typical multiphase voltage controlled oscillator is formed by N delay elements, such as figure 1 shown. The multiphase VCO 100 includes N differential delay elements 102 connected in series. Each diff...

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Problems solved by technology

[0006] However, the uniformity of the phase difference generated by this method is easily affected by conditions such as manufacturing process or temperature, so it is not easy to achieve a uniform phase difference at high and low frequencies

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