Impedance calibration method and system
A technology of impedance calibration and impedance adjustment, which is applied in the direction of measuring resistance/reactance/impedance, measuring devices, instruments, etc., can solve problems such as output impedance deviation, and achieve the effect of eliminating cumulative errors and accurate results
Pending Publication Date: 2022-01-28
SHANGHAI ANLOGIC INFOTECH CO LTD
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Problems solved by technology
The output impedance of a high-speed TX circuit is generally composed of MOSFETs and resistors. During the chip manufacturing process, due to the existence of process errors, the output impedance will deviate.
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[0035] In order to make the purpose, technical solutions and advantages of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the present invention. Obviously, the described embodiments are part of the present invention Examples, not all examples. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention. Unless otherwise defined, the technical terms or scientific terms used herein shall have the usual meanings understood by those skilled in the art to which the present invention belongs. As used herein, "comprising" and similar words mean that the elements or items appearing before the word include the elements or items listed after the word and their equivalents, without excluding other el...
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The invention provides an impedance calibration method, which comprises the following steps of: adjusting the control parameter of a second impedance adjusting unit so as to adjust the impedance of the second impedance adjusting unit until a comparator unit outputs a calibration completion signal, and taking the control parameter of the second impedance adjusting unit as a second adjusting control parameter; adjusting the control parameter of a first impedance adjusting unit so as to adjust the impedance of the first impedance adjusting unit until the comparator unit outputs a calibration completion signal, taking the control parameter of the first impedance adjusting unit as a first adjusting control parameter, and adjusting a high-speed emission circuit according to the first adjusting control parameter and the second adjusting control parameter, so that a first resistor unit, a second resistor unit and a third resistor unit are respectively used as references in the process of calibrating the impedance of the high-speed emission circuit, the accumulative error in the calibration process is effectively eliminated, and the calibrated result is more accurate. The invention also provides an impedance calibration system for realizing the impedance calibration method.
Description
technical field [0001] The present invention relates to the technical field of impedance calibration, in particular to an impedance calibration method and system. Background technique [0002] Due to the reflection of the high-speed signal during transmission, the output impedance of the high-speed TX circuit must be matched with the characteristic impedance of the external transmission line. When the characteristic impedance of the transmission line is 50Ohm, the output impedance of the high-speed TX circuit also needs to be close to 50Ohm to reduce reflection and improve signal quality. The output impedance of a high-speed TX circuit is generally composed of MOSFETs and resistors. During the chip manufacturing process, due to the existence of process errors, the output impedance will deviate. The impedance of the MOSFET will also be affected by the power supply voltage. Therefore, after the chip is manufactured, the output impedance will deviate from 50Ohm due to the devi...
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IPC IPC(8): G01R27/02
CPCG01R27/02
Inventor 张浩
Owner SHANGHAI ANLOGIC INFOTECH CO LTD