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Calibration device for a direct digital modulator

A digital modulator and calibration equipment technology, applied in the field of calibration DDM, can solve problems such as difficult to design direct measurement system

Active Publication Date: 2019-04-26
HUAWEI TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Difficult to design a direct measurement system that provides the required accuracy under all output signal conditions

Method used

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  • Calibration device for a direct digital modulator
  • Calibration device for a direct digital modulator
  • Calibration device for a direct digital modulator

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Embodiment Construction

[0084] The following detailed description is presented in conjunction with the accompanying drawings, which form a part hereof, and show by way of illustration specific aspects in which the invention may be practiced. It is to be understood that other aspects may be utilized and structural or logical changes may be made without departing from the scope of the present invention. Accordingly, the following detailed description is not to be taken as limiting, but the scope of the present invention is defined by the appended claims.

[0085] It should be understood that notes related to a described method also apply to a corresponding device or system for performing the method, and vice versa. For example, if certain method steps are described, a corresponding device may include means for performing the described method steps, even if such means are not explicitly described or illustrated in the figures. Furthermore, it should be understood that the features of the various exempl...

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Abstract

The disclosure relates to a calibration device (1110) for a direct digital modulator (DDM) (1120), wherein the DDM (1120) comprises a plurality of elements (1121) to generate an output signal (1124) based on a modulation of an input signal (1122) according to a predetermined constellation, the calibration device (1110) comprising: a calibration controller (1111) configured to provide a stimulus (1113) to at least one (1121a) of the elements (1121); and a measurement device (1112) configured to measure an output signal (1124) of the DDM (1120) responsive to the stimulus (1113) provided to the at least one element (1121a), wherein the calibration controller (1111) is configured to provide the stimulus (1113) based on an oscillation signal applied to the input of the DDM (1120) and an anti-phase oscillation signal applied to an error compensation path of the DDM (1120).

Description

technical field [0001] The present invention relates to a calibration device for a direct digital modulator (DDM), a DDM and a method for calibrating a DDM. Background technique [0002] The effective accuracy of a Direct-Digital to RF Modulator (DDRM) used in a wireless transmitter is degraded by the fact that the effective contribution of each unit to the output does not match the nominal contribution of that unit , which also leads to an increase in the noise level. This is especially problematic outside the spectrum of the desired transmitted signal, as it can lead to violations of spectrum emission requirements or system specifications. The receive frequency band of a frequency division duplex (FDD) system is in particular a problematic region of the spectrum because the receiver is insensitive to a reduction in the usable operating range of the transceiver. [0003] In order to meet the specifications of cellular systems and the like, it is necessary to reduce errors...

Claims

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Application Information

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IPC IPC(8): H04B17/14H04B17/17
CPCH04B17/14H04B17/17H04B17/26
Inventor 彼得·帕尔默斯尼尔斯·克里斯多夫斯帕特里克·万德纳麦勒乔纳斯·格拉尔杜斯·桑塞姆科恩·科内利森
Owner HUAWEI TECH CO LTD
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