Device and method for down-mixing of a radio-frequency signal, which has been received by radio, to baseband

A radio frequency signal and wireless device technology, which is applied to the device and field of down-mixing radio frequency signals received by a wireless device to baseband, and can solve the problems of doubling the complexity of the mixer level and high complexity of the digital mixer level

Inactive Publication Date: 2005-11-09
INFINEON TECH AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this approach reduces the complexity of implementing the filter stages, the complexity of the digital mixer stages used is still very high
For example, if the down-mixing process is done with an oversampling factor of 4, then the complexity of the provided mixer stage will be doubled

Method used

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  • Device and method for down-mixing of a radio-frequency signal, which has been received by radio, to baseband
  • Device and method for down-mixing of a radio-frequency signal, which has been received by radio, to baseband
  • Device and method for down-mixing of a radio-frequency signal, which has been received by radio, to baseband

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Embodiment Construction

[0079] According to a preferred embodiment of the present invention, image 3 A block diagram representing a circuit arrangement for downmixing a radio frequency signal received by a wireless device to a baseband. In this embodiment, the wireless transmission used is a wireless transmission according to the GSM standard.

[0080] Such as image 3 The circuit arrangement shown has a "low intermediate frequency (low IF)" architecture, that is to say a radio frequency signal received by the wireless device is converted by an analog mixer stage 14 into a radio frequency signal having a "low intermediate frequency" frequency f lowIF The analog intermediate frequency signal. In particular said "low-IF" frequency is variable.

[0081] The analog intermediate frequency signal is then converted by an analog / digital converter stage 15 into a digital intermediate frequency signal x. The analog / digital converter stage 15 uses for this purpose a symbol rate f GSM Also greater than N t...

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Abstract

A device includes a first mixer for production of a first analogue intermediate signal by down-mixing of a radio-frequency signal. The device also includes an A / D converter for production of a first digital intermediate signal, a second mixer for production of a second digital intermediate signal from the first digital intermediate signal, and a third mixer for production of a digital baseband signal from the second digital intermediate signal. The second mixer has a higher sampling frequency than the third mixer.

Description

technical field [0001] The present invention relates to an apparatus and a method for downmixing of radio frequency signals received by a wireless device. The device is integrated in a wireless receiver stage. Background technique [0002] The mobile radio receiver stage of a time-division multiplexing system, such as GSM / EDGE or IS-136, must handle relatively narrowband (Narrowband) signals with as little noise as possible and as little as possible other interference, where interference on adjacent frequencies Signals are superimposed. [0003] The invention relates to the part of the mobile radio receiver stage, by which the radio frequency signal at the antenna book input is converted into a digital sampled signal at baseband. Said mobile radio receiver stage comprises inter alia a mixing device for frequency conversion, two analog / digital converter stages for sampling the quadrature parts of the comparison signal, and for the digital signal Another processing procedur...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03D7/00H04B1/26H04B1/28H04L27/06H04L27/14H04L27/233
CPCH04B1/28H04L27/2338
Inventor 吴晓芬M·克雷格H·纽豪斯
Owner INFINEON TECH AG
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