Impedance calibration device and method thereof

Abstract

An impedance calibration device provided includes a timing device, a first transmitter, a first variable resistor, a second variable resistor and a first receiver. The first variable resistor is used to receive a first adjustment code. The second variable resistor is used to receive a second adjustment code. The first receiver generates a first contact digital signal according to a first contact voltage. The first receiver generates a first terminate digital signal according to a first terminate voltage and the first adjustment code. The first receiver generates a first load digital signal according to a load voltage and the second adjustment. The timing device dynamically adjust the first adjustment code and the second adjustment code according to the first contact digital signal, the first terminate digital signal and the first load digital signal.

Description

FIELD OF THE DISCLOSURE[0001]The present disclosure relates to a calibration device, and in particular to an impedance calibration device and a method thereof.BACKGROUND OF THE DISCLOSURE[0002]Conventional semiconductor manufacturing processes may cause drifting to occur, and the drifting in the semiconductor processes may result in a change of parameters (for example, impedance, inductance and resistance) of various electronic elements in integrated circuits. In communication systems, the transmitter and the receiver must strictly match each other in impedance, and lack thereof may result in signal distortion or signal loss. While resistances may be modified in the prior art by fine-tuning, and the occurrence of drifting may be reduced by process control, the former would increase test times and costs, and the latter would increase costs associated with integrated circuits.SUMMARY OF THE DISCLOSURE[0003]The present disclosure provides an impedance calibration device and a method th...

AI Technical Summary

Benefits of technology

[0003]The present disclosure provides an impedance calibration device and a method thereof; with the inclusion of a few electronic elements, and with use of adjustment codes to adjust an impedance of a variable resistor by digital-to-analog method, the impedance calibration device can find an optimal impedance matching digital signal.

Problems solved by technology

Conventional semiconductor manufacturing processes may cause drifting to occur, and the drifting in the semiconductor processes may result in a change of parameters (for example, impedance, inductance and resistance) of various electronic elements in integrated circuits.

In communication systems, the transmitter and the receiver must strictly match each other in impedance, and lack thereof may result in signal distortion or signal loss.

While resistances may be modified in the prior art by fine-tuning, and the occurrence of drifting may be reduced by process control, the former would increase test times and costs, and the latter would increase costs associated with integrated circuits.

Images