CN108540149B - Wireless radio frequency transmitter - Google Patents
Wireless radio frequency transmitter Download PDFInfo
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- CN108540149B CN108540149B CN201810774890.XA CN201810774890A CN108540149B CN 108540149 B CN108540149 B CN 108540149B CN 201810774890 A CN201810774890 A CN 201810774890A CN 108540149 B CN108540149 B CN 108540149B
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- local oscillation
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/02—Transmitters
- H04B1/04—Circuits
Abstract
The present invention provides a wireless radio frequency transmitter, comprising: the baseband processor is used for modulating the data to be transmitted to form a baseband modulation signal; the digital-to-analog converter is used for performing digital-to-analog conversion on the baseband modulation signal; the low-pass filter is used for performing low-pass filtering on the baseband modulation signal after the digital-to-analog conversion; a voltage controlled oscillation circuit for generating a reference clock signal; the fractional frequency division circuit is used for carrying out fractional frequency division on the reference clock signal to generate a local oscillation signal; and the mixer is used for carrying out up-conversion on the baseband modulation signal after the low-pass filtering according to the local oscillation signal to form a radio frequency transmitting signal. A radio frequency transmitter greatly reduces the influence of integral multiple harmonics of a local oscillation signal on a voltage-controlled oscillation circuit. Compared with the prior art, the invention greatly reduces the influence of integral multiple harmonic waves of the local oscillation signal on the voltage-controlled oscillation circuit.
Description
[ technical field ] A method for producing a semiconductor device
The invention relates to the technical field of electronic circuits, in particular to a wireless radio frequency transceiver.
[ background of the invention ]
A wireless radio frequency transceiver comprises a Transmitter (TX) and a Receiver (RX). The Transmitter (TX) processes a MODEM (MODEM) signal and transmits the signal through an ANTENNA (ANTENNA); the Receiver (RX) receives the antenna signal, and then performs amplification, frequency conversion, filtering, digitization, etc., and then sends it to a MODEM (MODEM).
As communication technology develops, more and more information is communicated within the same bandwidth, and the requirements for the radio transceiver are correspondingly more complicated. A local oscillation signal generating circuit of a general traditional transmitter structure comprises a radio frequency voltage-controlled oscillation circuit, an integer frequency division circuit and a local oscillation signal buffer circuit; since the integral multiple harmonic of the local oscillation signal is at the VCO frequency, it will be pulled to destroy the phase noise.
Therefore, there is a need to provide a new technical solution to solve the above problems.
[ summary of the invention ]
It is an object of the present invention to provide a wireless rf transmitter that greatly reduces the effect of integer multiples of the local oscillator signal on the vco circuitry.
In order to solve the above problems, the present invention provides a wireless radio frequency transmitter, comprising: the baseband processor is used for modulating the data to be transmitted to form a baseband modulation signal; the digital-to-analog converter is used for performing digital-to-analog conversion on the baseband modulation signal; the low-pass filter is used for performing low-pass filtering on the baseband modulation signal after the digital-to-analog conversion; a voltage controlled oscillation circuit for generating a reference clock signal; the fractional frequency division circuit is used for carrying out fractional frequency division on the reference clock signal to generate a local oscillation signal; and the mixer is used for carrying out up-conversion on the baseband modulation signal after the low-pass filtering according to the local oscillation signal to form a radio frequency transmitting signal.
Further, the baseband processor performs phase compensation on the baseband modulation signal.
Further, a phase difference between the ideal phase signal of the local oscillation signal and the actual phase signal of the local oscillation signal is a first phase difference value, and the baseband modulation signal is subjected to phase compensation based on the first phase difference value to cancel the first phase difference value.
Further, a radio frequency transmission signal is represented as:
Re[(I+j＊Q)＊ej＊LO]where I, Q are quadrature signals of the baseband modulation signal, L O are ideal phase signals of the local oscillation signal, and when the phase signal of the local oscillation signal is not the ideal quadrature signal, it is equivalent to the local oscillation signal being in ej＊LOWith an additional phase difference
I.e. the local oscillator signal is in fact
At this time, in order to restore an ideal transmission signal, an opposite phase is added to the baseband modulation signal
Thereby achieving the purpose of offsetting the extra phase difference:
compared with the prior art, the invention adopts the fractional frequency division circuit, rather than an integer frequency divider, to divide the frequency of the reference clock signal to obtain the local oscillation signal, thereby greatly reducing the influence of the integer harmonic of the local oscillation signal on the voltage-controlled oscillation circuit.
[ description of the drawings ]
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive exercise. Wherein:
fig. 1 is a functional schematic of a wireless radio frequency transmitter of the present invention in one embodiment;
[ detailed description ] embodiments
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.
Reference herein to "one embodiment" or "an embodiment" means that a particular feature, structure, or characteristic may be included in at least one implementation of the invention. The appearances of the phrase "in one embodiment" in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. Unless otherwise specified, the terms connected, and connected as used herein mean electrically connected, directly or indirectly.
The invention provides a wireless radio frequency transmitter, which adopts a fractional frequency division circuit instead of an integer frequency divider to divide a frequency of a reference clock signal to obtain a local oscillation signal, thereby greatly reducing the influence of integer harmonic of the local oscillation signal on a voltage-controlled oscillation circuit.
Fig. 1 is a functional schematic of a wireless radio frequency transmitter 100 in one embodiment of the present invention. As shown in fig. 1, the wireless radio frequency transmitter includes a baseband processor 110, digital-to- analog converters 120a, 120b, low- pass filters 130a, 130b, mixers 140a and 140b, a voltage-controlled oscillation circuit 150, and a fractional division circuit 160.
The baseband processor 110 is configured to modulate data to be transmitted to form a baseband modulation signal, which specifically includes an I (in-phase) component and a q (quadrature) component. The digital-to-analog converter is configured to perform digital-to-analog conversion on the baseband modulation signal, where the digital-to-analog converter 120a performs digital-to-analog conversion on the I component, and the digital-to-analog converter 120b performs digital-to-analog conversion on the Q component.
The low pass filter is configured to perform low pass filtering on the baseband modulation signal after digital-to-analog conversion, where the low pass filter 130a is configured to perform low pass filtering on an I component of the baseband modulation signal after digital-to-analog conversion, and the low pass filter 130b is configured to perform low pass filtering on a Q component of the baseband modulation signal after digital-to-analog conversion.
The voltage controlled oscillation circuit 150 is used to generate a reference clock signal. Fractional division circuit 160 is used to divide the reference clock signal by a fraction to generate the local oscillation signal, for example, the division value of the fractional division circuit includes but is not limited to 1.5,2.5 or 3.5.
The mixer up-converts the baseband modulation signal after the low-pass filtering according to the local oscillation signal to form a radio frequency transmitting signal, wherein the mixer 140a up-converts the I component of the baseband modulation signal after the low-pass filtering according to the local oscillation signal to form a radio frequency transmitting signal, and the mixer 140b up-converts the Q component of the baseband modulation signal after the low-pass filtering according to the local oscillation signal to form a radio frequency transmitting signal.
Because the fractional frequency division is adopted, the difference between the integral multiple harmonic of the local oscillation signal and the frequency of the voltage-controlled oscillation circuit is larger, thereby greatly avoiding the traction effect of the transmitting signal on the VCO (voltage-controlled oscillation circuit). Meanwhile, as the fractional frequency division circuit is adopted, the phase difference of the local oscillation signals is not orthogonal signals, and the phase difference can be compensated by adjusting the phase difference of the modulation signals of the baseband, thereby realizing the modulation characteristic same as that of the orthogonal local oscillation signals.
One radio frequency transmit signal is represented as:
Re[(I+j＊Q)＊ej＊LO]where I, Q are quadrature signals of the baseband modulation signal, L O are ideal phase signals of the local oscillation signal, and when the phase signal of the local oscillation signal is not the ideal quadrature signal, it is equivalent to the local oscillation signal being in ej＊LOWith an additional phase difference
I.e. the local oscillator signal is
At this time, in order to restore an ideal transmission signal, an opposite phase is added to the baseband modulation signal
Thereby achieving the purpose of offsetting the extra phase difference:
in the present invention, the terms "connected", connected, "connecting," and "connecting" mean electrically connected, and if not specifically stated, directly or indirectly indicate electrically connected.
It should be noted that those skilled in the art can make modifications to the embodiments of the present invention without departing from the scope of the appended claims. Accordingly, the scope of the appended claims is not to be limited to the specific embodiments described above.
Claims (1)
1. A wireless radio frequency transmitter, comprising:
the baseband processor is used for modulating data to be transmitted to form a baseband modulation signal;
the digital-to-analog converter is used for performing digital-to-analog conversion on the baseband modulation signal;
the low-pass filter is used for performing low-pass filtering on the baseband modulation signal after the digital-to-analog conversion;
a voltage controlled oscillation circuit for generating a reference clock signal;
the fractional frequency division circuit is used for carrying out fractional frequency division on the reference clock signal to generate a local oscillation signal;
a mixer for up-converting the low-pass filtered baseband modulation signal according to the local oscillation signal to form a radio frequency transmitting signal,
wherein the baseband processor performs phase compensation on the baseband modulation signal,
the phase difference between the ideal phase signal of the local oscillation signal and the actual phase signal of the local oscillation signal is a first phase difference value, the baseband modulation signal is subjected to phase compensation based on the first phase difference value to offset the first phase difference value,
one radio frequency transmit signal is represented as:
Re[(I+j*Q)*ej*LO]where I and Q are I and Q components of the baseband modulation signal, L O is an ideal phase signal of the local oscillation signal, which is equivalent to the local oscillation signal being in e when the phase signal of the local oscillation signal is not an ideal quadrature signalj*LOHas an extra phase difference
I.e. the local oscillator signal is in fact
At this time, in order to restore an ideal transmission signal, an opposite phase is added to the baseband modulation signal
Thereby reach the mesh of offsetting extra phase difference:
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| CN201810774890.XA CN108540149B (en) | 2018-07-16 | 2018-07-16 | Wireless radio frequency transmitter |
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| CN201810774890.XA CN108540149B (en) | 2018-07-16 | 2018-07-16 | Wireless radio frequency transmitter |
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| CN108540149B true CN108540149B (en) | 2020-07-24 |
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| CN111308882B (en) * | 2019-12-04 | 2021-07-06 | 山东大学 | Circuit system for pseudo satellite clock synchronization and working method thereof |
| CN111490782B (en) * | 2020-04-02 | 2024-03-08 | 北京智芯微电子科技有限公司 | Up-converter of direct up-conversion transmitter and up-conversion method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US6560297B1 (en) * | 1999-06-03 | 2003-05-06 | Analog Devices, Inc. | Image rejection downconverter for a translation loop modulator |
| JP2004056409A (en) * | 2002-07-19 | 2004-02-19 | Ando Electric Co Ltd | Phase locked loop circuit employing fractional frequency divider |
| US7672645B2 (en) * | 2006-06-15 | 2010-03-02 | Bitwave Semiconductor, Inc. | Programmable transmitter architecture for non-constant and constant envelope modulation |
| CN101316105A (en) * | 2008-06-11 | 2008-12-03 | 苏州中科半导体集成技术研发中心有限公司 | Multi-standard multi-module wireless transceiver |
| JP4881997B2 (en) * | 2009-12-17 | 2012-02-22 | アンリツ株式会社 | Spectrum analyzer and spectrum analysis method |
| CN101924573B (en) * | 2010-09-17 | 2012-11-28 | 天津里外科技有限公司 | TD-SCDMA/WLAN (Time Division-Synchronization Code Division Multiple Access)/(Wireless Local Area Network) multi-standard transceiver |
| US8803568B2 (en) * | 2011-11-28 | 2014-08-12 | Qualcomm Incorporated | Dividing a frequency by 1.5 to produce a quadrature signal |
| CN103929173B (en) * | 2014-04-11 | 2016-08-24 | 华为技术有限公司 | Frequency divider and Wireless Telecom Equipment |
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