Up-converter and up-conversion method

A frequency converter and mixer technology, applied in the field of communication, can solve the problems of large volume, high implementation cost and complex circuit structure of the upconverter, and achieve the effects of clean signal, reduced circuit complexity, cost reduction and volume reduction.

Inactive Publication Date: 2012-08-15
이노피데이인코포레이티드
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The technical problem to be solved in this application is to provide an up-converter and an up-conversion method...

Method used

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  • Up-converter and up-conversion method

Examples

Experimental program
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Embodiment 1

[0025] refer to figure 1 , shows a structural block diagram of an up-converter according to Embodiment 1 of the present application.

[0026] The up-converter in this embodiment includes a dual-channel digital-to-analog converter 102 and an analog quadrature modulator 104 . Wherein, the dual-channel digital-to-analog converter 102 is used to convert the input baseband signal into two orthogonal low-IF signals and output them; the analog quadrature modulator 104 is used to receive two orthogonal low-IF signals, and The local oscillator signal of the first local oscillator in the up-converter is used to modulate the two orthogonal low-intermediate frequency signals into an intermediate frequency signal and output it.

[0027] Among them, it is well known to those skilled in the art that the low intermediate frequency here is relative to the intermediate frequency, the operating frequency of the low intermediate frequency is generally 36-70 MHz, and the range of the intermediate...

Embodiment 2

[0033] refer to figure 2 , shows a structural block diagram of an up-converter according to Embodiment 2 of the present application.

[0034] The up-converter of this embodiment includes: a dual-channel digital-to-analog converter 202, which is used to convert the input baseband signal into two orthogonal low-intermediate frequency signals and output them; an analog quadrature modulator 204, which is used to receive two orthogonal The low-intermediate frequency signals are intersected, and the two orthogonal low-intermediate frequency signals are modulated into intermediate frequency signals by using the local oscillator signal of the first local oscillator in the up-converter and output.

[0035] Wherein, a numerically controlled oscillator 2022 and a digital quadrature modulator 2024 are provided in the dual-channel digital-to-analog converter 202 . The digitally controlled oscillator 2022 is used for generating the carrier signal of the low intermediate frequency, and the...

Embodiment 3

[0045] refer to image 3 , shows a schematic structural diagram of an up-converter according to Embodiment 3 of the present application.

[0046] The up-converter of this embodiment includes: dual-channel digital-to-analog converter DAC, analog quadrature modulator, band-pass filter, mixer (Mixer), low-pass filter, automatic level control circuit (ALC), the first One local oscillator (LO1) and second local oscillator (LO2).

[0047] The dual-channel digital-to-analog converter of this embodiment can adjust the phase and amplitude of the two-channel signals output by it, so that the phase difference of the two-channel analog signals is 90 degrees. Together with the analog quadrature modulator, after the first up-conversion The sideband and carrier leakage of the output signal have a good suppression effect. Among them, the dual-channel digital-to-analog converter itself has a 32-bit numerically controlled oscillator (NCO) and a digital quadrature modulator. In actual work, th...

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Abstract

The invention provides an up-converter and an up-conversion method. The up-converter comprises a double-path digital-to-analog converter for converting an input baseband signal into two paths of orthogonal mid-frequency and low-frequency signals and outputting the two paths of orthogonal mid-frequency and low-frequency signals, and an analog orthogonal modulator for receiving the two paths of orthogonal mid-frequency and low-frequency signals, modulating the two paths of orthogonal mid-frequency and low-frequency signals into mid-frequency signals by using a local oscillation signal of a first oscillator in the up-converter and outputting the mid-frequency signals. According to the up-converter and the up-conversion method, the volume of the up-converter, the circuit complexity and the implementation cost are reduced; and furthermore, the analog orthogonal modulator replaces a frequency mixer and is used for processing the signals, so that spurious signals are reduced, and the signals are relatively clean.

Description

technical field [0001] The present application relates to the technical field of communications, and in particular to an up-converter and an up-convert method. Background technique [0002] An upconverter is a device that moves a low-frequency signal to a high-frequency band in the frequency domain. For the transmitter, the use of the up-converter has the advantages of simplifying the design and manufacture of the antenna, facilitating generation, improving the utilization of the spectrum, and preventing co-channel interference; for the signal generator, the use of the up-converter can generate different high-frequency Signal. [0003] DAC (Digital to Analog Converter, digital-to-analog converter) is an important part of the up-converter, and it is a converter that converts a discrete signal in the form of a binary number into an analog signal based on a reference. Through the DAC, the up-converter realizes the conversion of digital information and analog signal. At prese...

Claims

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Application Information

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IPC IPC(8): H03D7/16
Inventor 张辉王西强杨少华
Owner 이노피데이인코포레이티드
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