Calibration device and related method for phase difference between data and clock
AssigneeRealtek Semiconductor Corp.
InventorBin Zhang
Life of this patent
Estimating the term…
Abstract
A calibration device and related method for a phase difference between data signal and clock signal are disclosed. An apparatus of the invention includes: an adjustable delay circuit for delaying at least one of a first input signal and a second input signal according to a delay control signal, and generating a first signal and a second signal; a phase detection circuit for detecting a phase difference between the first signal and the second signal to output a phase difference signal; a charge pump and a capacitor for outputting a control signal according to the phase difference signal; a comparison circuit for outputting a comparison result according to the control signal; and, a digital control circuit for outputting the delay control signal according to the comparison result.
Claims15
An apparatus, comprising:
- an adjustable delay circuit for receiving a data signal and a clock signal, delaying at least one of the data signal and the clock signal according to a delay control signal, and generating a delayed data signal and a delayed clock signal;
- a phase detection circuit, coupled to the adjustable delay circuit, for receiving the delayed data signal and the delayed clock signal, and detecting a phase difference between the delayed data signal and the delayed clock signal to output a phase difference signal;
- a charge pump and a capacitor, coupled to the phase detection circuit, for outputting a control signal according to the phase difference signal;
- a comparison circuit, coupled to the capacitor, for outputting a comparison result according to the control signal;
- and
- a digital control circuit, coupled to the comparison circuit, for generating the delay control signal according to the comparison result.
A phase calibration method, comprising:
- receiving a data signal and a clock signal;
- delaying at least one of the data signal and the clock signal according to a delay control signal to generate a delayed data signal and a delayed clock signal;
- detecting a phase difference between the delayed data signal and the delayed clock signal to output a phase difference signal;
- outputting a voltage signal according to the phase difference signal;
- comparing the voltage signal with a reference voltage to output a comparison result;
- and
- outputting the delay control signal according to the comparison result.
Dependencies are inferred from the claim text.