Patent ID: 6856208

Claim:
A multi-phase oscillator, comprising: a delay loop buffer having N units of the delay unit that include a first delay unit, a second delay unit, . . . , a N th delay unit, wherein an output node of the first delay unit is electrically coupled to an input node of the second delay unit, an output node of the second delay unit is electrically coupled to an input node of the third delay unit, . . . , an output node of the N th delay unit is electrically coupled to an input node of the first delay unit, the N units of the delay unit constitute a mesh configuration having a 360° phase shift, the phase shift of every delay unit all equals to a value of 360° phase divided by N; and a plurality of oscillators, providing a plurality of oscillation signals to the delay loop buffer, by using the N units of the delay units to evenly divide a 360° phase to make the plural oscillation signals separately generated by the plural of oscillators have phases uniformly distributed in a 360° with fixed phase difference, wherein each delay unit further comprises: a PMOS having a source, a gate and a drain, wherein the source of the PMOS is electrically coupled to a power supply, the gate of the PMOS is coupled to ground, the drain of the PMOS is electrically coupled to the output node of the delay unit; and a NMOS having a source, a gate and a drain, wherein the drain of the NMOS is electrically coupled to the output node of the delay unit, the gate of the NMOS is electrically coupled to the input node of the delay unit, the source of the NMOS is electrically coupled to one of the plural oscillators that is corresponded to the NMOS.