Full-period digital time converter based on clock calibration technology

Abstract

The invention discloses a full-period digital time converter based on a clock calibration technology, which is characterized by comprising a single-to-differential circuit used for converting an input single-ended signal into a differential signal and inputting the differential signal into a multi-phase clock signal generation unit; the multi-phase clock signal generation unit is used for generating a multi-phase clock signal according to an input differential signal and inputting the multi-phase clock signal into the adjustable delay module; the adjustable delay module is used for delaying the multi-phase clock signal according to the output signal of the digital module and then inputting the delayed multi-phase clock signal into the multiplexer; the multiplexer is used for selecting a group of adjacent two-phase signals to output according to the switch control signal generated by the digital module; the phase interpolator is used for generating numerical control time signals according to two adjacent phase signals; the time-to-digital converter is used for calculating the time difference of rising edges of two adjacent phase signals and inputting the time difference to the digital module; and the digital module is used for generating a delay control signal of the adjustable delay module on the multiphase clock signal and a switch control signal according to the time difference of the rising edges of each group of adjacent two-phase signals.

Description

technical field [0001] The invention belongs to the technical field of radio frequency integrated circuits, and relates to a full-cycle digital time converter, which is applied to polar coordinate or phase difference digital transmitters, clock data recovery, time domain analog-to-digital converters, etc., and especially relates to a clock calibration technology, Used to improve the linearity of full-cycle digital-to-time converters. Background technique [0002] A full-cycle digital-to-time converter is a circuit module often used in the technical field of radio frequency integrated circuits. Polar or phase-difference digital transmitters can use full-cycle digital-to-time converters as phase modulators, and their linearity will affect the vector magnitude error, adjacent channel ratio, and other performance of the transmitter. A clock data recovery system can use a full-cycle digital-to-time converter as an eye opening detection, and its linearity will affect the accuracy...

AI Technical Summary

Problems solved by technology

Due to the error of the multi-phase clock in the existing digital time converter chip, its integral nonlinearity will have a fixed deviation with the control code, which is reflected in the position of the multi-phase clock switching will have a large nonlinear error

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