A ring oscillator based on multi-phase coupling calibration

Abstract

The application discloses a kind of ring oscillator based on multi-phase coupling calibration, belong to radio frequency integrated circuit design technical field, including three mutually coupled oscillation loops based on three-stage delay unit and the calibration loop between each oscillation loop, in the structure, the input node of the delay unit of each oscillation loop is connected with the calibration unit of calibration loop, when the phase inconsistency at both ends of calibration unit, oscillation loop current can be redistributed by calibration unit, and phase alignment is realized by current real-time compensation mechanism;When three oscillation loops are mutually coupled, the phase jitter caused by external noise disturbance to any oscillation loop, will be fed back to the remaining two oscillation loops through calibration loop, so as to realize automatic compensation and equalization of phase error in overall system, effectively reduce the phase noise of each oscillation loop.Simultaneously, the dynamic phase calibration mechanism of three oscillation loops significantly enhances the anti-single event effect capability of circuit.

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