Full-digital direct up-conversion circuit

A digital up-conversion and frequency-conversion circuit technology, applied in electrical components, analog conversion, transmission systems, etc., can solve problems such as leakage, increase baseband signal sources, etc., to avoid noise interference, simplify circuit complexity, and simplify the structure. Effect

Active Publication Date: 2013-10-09
ZHIHENG TECH CO LTD
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AI Technical Summary

Problems solved by technology

The current direct up-conversion schemes basically use digital-to-analog converters, and the introduction of digital-to-analog converters increases the signal requirements for the baseband signal source, requiring special adjustments to the signal interface parameters of the baseband signal source and the digital-to-analog converter. processing, such as the bit rate of the digital signal, the peak-to-peak ratio, the conversion rate of the digital-to-analog converter, etc., and the leakage of the local oscillator is serious.

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Embodiment Construction

[0021] The all-digital direct up-conversion circuit of the present invention includes a baseband processing module and an RF processing module. The baseband processing module interpolates the baseband signal of the input system, increases the data rate, and then performs amplitude reduction, then modulates the multi-bit parallel data of the signal into one bit serial data, and moves the noise spectrum; the RF processing The module performs N times multiplexing on the output data processed by the baseband processing module, converts it into parallel data, and then converts the parallel data into serial data output.

[0022] figure 1 It is a structural block diagram of an embodiment of the present invention. The whole system is implemented on a piece of FPGA hardware, including the baseband processing module 11 and the RF processing module 12 .

[0023] The baseband processing module 11 is used for data conversion and noise shaping of the input signal, and includes 3 sub-modul...

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Abstract

The invention relates to the technical field of up-conversion from baseband signals to radio frequency signals, in particular to a full-digital direct up-conversion circuit. The circuit comprises a baseband processing module and an RF processing module, wherein the baseband processing module carries out inwards-inserting processing on baseband signals input to a system to improve the data rate, then amplitude reduction is carried out, multi-bit parallel data of the signals are modulated to single-bit serial data, and a noise spectrum is moved. The RF processing module carries out N-times multiplexing on output data after processing through the baseband processing module, the output data are converted to parallel data, and then the parallel data are converted to serial data which are output. The circuit is little in noise interference, simple in structure, easy to implement and low in manufacturing cost.

Description

technical field [0001] The invention relates to the technical field of frequency up-conversion from baseband signals to radio frequency signals, in particular to an all-digital direct frequency up-conversion circuit. Background technique [0002] The up-conversion circuit is an important part of the radio frequency transmitter circuit, which completes the frequency conversion process of the signal from the baseband to the radio frequency. [0003] The radio frequency front-end transmitter of the wireless communication system usually has two kinds of up-conversion structures: a superheterodyne structure and a direct up-conversion structure. A superheterodyne transmitter converts the baseband frequency to an RF signal in two steps. The first frequency conversion operation is carried out in the digital domain, and is converted to an intermediate frequency through a four-phase quadrature up-conversion structure. The intermediate frequency signal is then converted into the anal...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B1/04H03M3/00
Inventor 吴林煌翁义龙苏凯雄郭里婷
Owner ZHIHENG TECH CO LTD
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