WO2014029142A1 - 高中频超外差+零中频结构的射频前端 - Google Patents

高中频超外差+零中频结构的射频前端 Download PDF

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Publication number
WO2014029142A1
WO2014029142A1 PCT/CN2012/081282 CN2012081282W WO2014029142A1 WO 2014029142 A1 WO2014029142 A1 WO 2014029142A1 CN 2012081282 W CN2012081282 W CN 2012081282W WO 2014029142 A1 WO2014029142 A1 WO 2014029142A1
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Prior art keywords
intermediate frequency
superheterodyne
output
frequency
pass filter
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PCT/CN2012/081282
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English (en)
French (fr)
Inventor
马建国
张为
张亮
赵毅强
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Tianjin University
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Tianjin University
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Priority to US14/117,628 priority Critical patent/US9270316B2/en
Publication of WO2014029142A1 publication Critical patent/WO2014029142A1/zh
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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
    • H04B1/06—Receivers
    • H04B1/16—Circuits
    • H04B1/26—Circuits for superheterodyne receivers
    • 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
    • H04B1/06—Receivers
    • H04B1/16—Circuits
    • H04B1/30—Circuits for homodyne or synchrodyne receivers
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03D—DEMODULATION OR TRANSFERENCE OF MODULATION FROM ONE CARRIER TO ANOTHER
    • H03D7/00—Transference of modulation from one carrier to another, e.g. frequency-changing
    • H03D7/18—Modifications of frequency-changers for eliminating image frequencies
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
    • H03F3/20—Power amplifiers, e.g. Class B amplifiers, Class C amplifiers
    • H03F3/24—Power amplifiers, e.g. Class B amplifiers, Class C amplifiers of transmitter output stages
    • 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
    • H04B1/06—Receivers
    • H04B1/16—Circuits
    • H04B1/26—Circuits for superheterodyne receivers
    • H04B1/28—Circuits for superheterodyne receivers the receiver comprising at least one semiconductor device having three or more electrodes
    • 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
    • H04B1/38—Transceivers, i.e. devices in which transmitter and receiver form a structural unit and in which at least one part is used for functions of transmitting and receiving
    • H04B1/40—Circuits
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/0002—Modulated-carrier systems analog front ends; means for connecting modulators, demodulators or transceivers to a transmission line
    • 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
    • H04B2001/0408—Circuits with power amplifiers

Definitions

  • the invention relates to a radio frequency front end. Especially related to a new type of high-IF super-heterodyne + zero-IF structure RF front
  • the core device of the communication device is the RF front-end chip.
  • the function of the RF front-end is to amplify, frequency-convert, filter and quantize the weak signal received at the antenna end of the receiver, and demodulate it into a baseband signal.
  • the design of the RF front-end circuit has guiding significance for the overall design of the receiver, which directly determines the performance of the wireless receiving device.
  • the traditional RF front-end structure of the communication terminal includes: a super-heterodyne structure, a zero-IF structure, a double-conversion wide-IF structure, and a quad-conversion low-IF structure.
  • the superheterodyne structure has excellent sensitivity, selectivity and dynamic range, and is considered to be the most reliable receiver topology, which has long been the first choice for high performance receivers.
  • the typical superheterodyne structure uses a mixer to downconvert the high frequency signal to a lower intermediate frequency and then perform channel filtering, amplification and demodulation, thereby effectively solving the difficulties encountered in high frequency signal processing. Its structure is shown in Figure 1.
  • the IF of the superheterodyne structure is generally lower than the RF signal frequency, which results in a serious disadvantage of the superheterodyne receiver: Mirror interference.
  • the principle is shown in Figure 2.
  • the superheterodyne structure is generally used for the RF front-end of the narrow-band communication system. If it is used in a broadband communication system, for example, the radio frequency front end of the super-heterodyne structure is used to receive the 900 MHz RF signal in the frequency range of lOOMH 1.2 GHz, assuming the intermediate frequency is 13.
  • the receiver actually receives not only the useful signal at 900MHz, but also the image interference signal at 927. 12MHz.
  • the image interference frequency of the traditional superheterodyne RF front-end is completely within the narrow range around the useful channel, which is extremely difficult to resolve, and the receiver sensitivity is low and difficult to integrate.
  • the structure is also found that the structure has extremely high requirements for the first local oscillator.
  • the tuning range of the frequency synthesizer required in the above example is 113. 56MHz 1213. 56MHz, the center frequency is lower, and the tuning ratio is as high as 85%.
  • the technical problem to be solved by the present invention is to provide a high-frequency super-heterodyne + zero-IF structure RF front-end structure that can effectively eliminate image interference, improve the sensitivity and reliability of the RF front-end circuit, and reduce the tuning ratio of the local oscillator. .
  • the technical solution adopted by the present invention is: a radio frequency front end of a high intermediate frequency super heterodyne + zero intermediate frequency structure, having a transmitting module and a receiving module, wherein the receiving module comprises: a serially connected device for receiving the transmitting module
  • the transceiver antenna is connected to a low pass filter through a wireless switch.
  • the superheterodyne unit includes a superheterodyne mixer, and the input ends of the superheterodyne mixer are respectively connected to a low noise amplifier and a first local oscillator, and an output terminal of the superheterodyne mixer is connected At the input of the mid-band pass filter, the input of the low noise amplifier is connected to the output of the low pass filter.
  • the zero intermediate frequency unit comprises a zero intermediate frequency mixer, an active low pass filter and a variable gain operational amplifier connected in sequence, wherein the input of the zero intermediate frequency mixer is respectively connected to the middle frequency band pass filter The output terminal and the second local oscillator are connected, and the output of the variable gain operational amplifier is connected to the input end of the digital-to-analog converter.
  • the transmitting module includes a modulation mixer, a power amplifier driving circuit and a power amplifier connected in sequence, wherein the input ends of the modulation mixer are respectively connected to the output end of the digital baseband module and the third local oscillator is connected, The output of the power amplifier is connected to the wireless switch of the transceiver antenna.
  • the output frequency of the superheterodyne unit is set to a fixed frequency of 2.45 GHz.
  • the tuning range of the first local oscillator is 1. 25 GHz ⁇ 2. 35 GHz.
  • the RF front end of the high intermediate frequency super heterodyne + zero intermediate frequency structure of the present invention has a first intermediate frequency of 2.45 GHz, which has two advantages: 1. Eliminating image interference. When the frequency of the input RF signal is 100MHz ⁇ 1. 2GHz, the corresponding image interference frequency is 3. 7GHz ⁇ 4. 8GHz, which is not in the input signal band, avoiding the image interference problem, and does not need the image suppression filter and the IF filter. , can improve the system integration, reduce the system power consumption; at the same time, the local oscillator tuning range is 1. 25GHz ⁇ 2. 35GHz, compared with the 100MHz ⁇ l. 2GHz local oscillator tuning range required by the traditional superheterodyne structure.
  • the center frequency is increased from 650MHz to 1.8GHz, and the tuning ratio is reduced from 85% to 30%, which greatly reduces the difficulty of the frequency synthesizer design. Therefore, the high-IF super-heterodyne structure is easy to implement. 2.
  • the follow-up processing technology for the 2.45 GHz IF signal is very mature and the scheme is highly feasible.
  • Figure 1 is a block diagram of a typical superheterodyne structure RF front end
  • Figure 2 is a schematic diagram of image interference
  • FIG. 3 is a block diagram showing the configuration of an RF front end of the high intermediate frequency super heterodyne + zero intermediate frequency structure of the present invention.
  • Second local oscillator 63 Active low-pass filter
  • the radio frequency front end of the high intermediate frequency super heterodyne + zero intermediate frequency structure of the invention comprises a transmitting module and a receiving module, and the receiving module completes receiving, filtering, upconverting, downconverting and demodulating the radio frequency signal.
  • the transmitting module performs modulation and transmission of the baseband signal.
  • the receiving module includes: a transceiver antenna 1, a low-pass filter 3, a super-heterodyne unit 4, and an intermediate-frequency band pass filter 5, which are sequentially connected to receive signals transmitted by the transmitting module.
  • the zero intermediate frequency unit 6, the digital to analog converter 7, and the digital baseband module 8, the output of the digital baseband module 8 is connected to the transmitting module 9.
  • the transceiver antenna 1 is connected to the low pass filter 3 via a wireless switch 2.
  • the superheterodyne unit 4 includes a superheterodyne mixer 42.
  • the input ends of the superheterodyne mixer 42 are respectively connected to the low noise amplifier 41 and the first local oscillator 43, the superheterodyne mixer.
  • An output of 42 is connected to an input of said intermediate band pass filter 5, and an input of said low noise amplifier 41 is connected to an output of low pass filter 3. 5GHz ⁇ 2. 35GHz
  • the tuning range of the first local oscillator 43 is 1. 25GHz ⁇ 2. 35GHz, the tuning frequency of the first local oscillator 43 is 1. 25GHz ⁇ 2. 35GHz .
  • the zero intermediate frequency unit 6 includes a zero intermediate frequency mixer 61, an active low pass filter 63 and a variable gain operational amplifier 64 connected in sequence, wherein the input ends of the zero intermediate frequency mixer 61 are respectively connected.
  • An output terminal of the intermediate band pass filter 5 and a second local oscillator 62 are connected, and an output of the variable gain operational amplifier 64 is connected to an input end of the digital to analog converter 7.
  • the transmitting module 9 includes a modulation mixer 91, a power amplifier driving circuit 92 and a power amplifier 93 connected in sequence.
  • the input ends of the modulation mixer 91 are respectively connected to the output end of the digital baseband module 8 and the connection end.
  • the three local oscillators 94, the output of the power amplifier 93 is connected to the wireless switch 2 of the transmitting and receiving antenna 1.
  • the working principle of the receiving module of the high-frequency super-heterodyne + zero-IF structure of the radio frequency front end of the invention the transmitting and receiving antenna receives the radio frequency signal, and the output is connected with a low-pass filter to low-pass filter the radio frequency signal to filter out interference.
  • the output of the low-pass filter is connected to a low-noise amplifier that performs low-noise amplification of the weak, useful signal for subsequent circuit processing.
  • the output of the low noise amplifier and the output of the first local oscillator are connected to the superheterodyne mixer, and the signal is upconverted to the first intermediate frequency 2.
  • the output of the 45 GHz 0 superheterodyne mixer is connected to the mid-band pass filter, filtering In addition to interference and channel selection.
  • the output of the mid-band pass filter and the output of the second local oscillator are connected to a zero intermediate frequency mixer, and the first intermediate frequency signal is downlinked to a low intermediate frequency that the digital circuit can process.
  • the output of the zero-IF mixer is connected to an active low-pass filter to filter out clutter.
  • the output of the active low-pass filter is connected to a variable gain operational amplifier, and the output of the variable gain operational amplifier is connected to a digital-to-analog converter (A/D) in a digital-to-analog unit, and the intermediate frequency analog signal is converted into a baseband.
  • A/D digital-to-analog converter
  • the digital signal can be processed, and then the output of the digital-to-analog converter is connected to the digital baseband circuit for demodulation.
  • the working principle of the high-IF super-heterodyne + zero-IF structure transmitting module of the present invention the output of the digital baseband circuit in the digital-to-analog converter + digital baseband unit and the output of the third local oscillator are connected to the modulation mixer, and the baseband is The signal is modulated to the RF frequency.
  • the output of the modulation mixer is connected to a power amplifier drive circuit, and the power amplifier drive circuit drives the power amplifier to increase the transmit power.
  • the output of the power amplifier is connected to the transmit antenna.
  • the first intermediate frequency in the transmitting module of the high-IF super-heterodyne + zero-IF structure of the present invention is set to a fixed frequency of 2.45 GHz.
  • the input RF signal frequency is 100MHz ⁇ 1. 2GHz
  • the corresponding image interference frequency is 3. 7GHz ⁇ 4. 8GHz, not in the input signal band, it is easy to filter with a simple low-pass filter, effectively avoiding mirroring. Interference problem, Improve system integration and reduce system power consumption;
  • the tuning range of the local oscillator is 1.25GHz ⁇ 2.35GHz, compared with the local tuning range of 113.56MHz ⁇ 1213.56MHz required by the traditional superheterodyne structure, the center frequency is 650MHz.
  • the tuning ratio is reduced from 85% to 30%, greatly reducing the difficulty of frequency synthesizer design.
  • the subsequent processing technology for the 2.45 GHz IF signal is mature and the solution is highly feasible.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Power Engineering (AREA)
  • Superheterodyne Receivers (AREA)
  • Transceivers (AREA)
  • Transmitters (AREA)

Description

高中频超外差 +零中频结构的射频前端 技术领域
本发明涉及一种射频前端。 特别是涉及一种新型的高中频超外差 +零中频结构的射频前
背景技术
在众多无线接入系统中， 通信设备的核心器件是射频前端芯片。 射频前端的功能主要 是对接收机天线端接收到的微弱信号进行放大、 变频、 滤波和量化， 解调为基带信号。 射 频前端电路的设计对接收机整体的设计具有指导意义， 直接决定了无线接收设备的性能。
通讯终端传统的射频前端结构包括： 超外差结构、 零中频结构、 二次变频宽中频结构 和二次变频低中频结构等。 其中超外差结构具有极佳的灵敏度、 选择性和动态范围， 被认 为是最可靠的接收机拓扑结构， 在长久以来成为高性能接收机的首选。 典型的超外差结构 使用混频器将高频信号下变频到一个较低的中频频率后再进行信道滤波、 放大和解调， 从 而有效的解决了高频信号处理所遇到的困难。 其结构如图 1 所示。 为了有效滤除镜像干扰 往往需要高品质因子的中频滤波器， 这是当代 CMOS工艺所无法实现的。 但是， 超外差结构 的中频一般都低于射频信号频率， 这导致超外差接收机存在一个严重的缺点： 镜像干扰。 其原理如图 2 所示。 另外超外差结构一般用于窄带通讯系统射频前端， 如果用于宽带通讯 系统， 例如： 采用超外差结构射频前端接收 lOOMH l. 2GHz的频率范围中 900MHz的射频信 号， 假设中频频率为 13. 56MHz , 那么实际上接收机不仅接受到 900MHz处的有用信号， 还接 收到了 927. 12MHz 处的镜像干扰信号。 传统超外差结构射频前端的镜像干扰频率完全落在 了有用信道附近很窄的范围内， 极难分辨， 接收机灵敏度低且难以集成。 另外， 如果将该 结构应用于宽带通信系统， 还会发现该结构对第一本振的要求极高。 上例中所需的频率合 成器的调谐范围为 113. 56MHz 1213. 56MHz,中心频率较低， 调谐比高达 85% 发明内容
本发明所要解决的技术问题是， 提供一种可以有效地消除镜像干扰， 提高了射频前端 电路的灵敏度和可靠性， 降低了本振的调谐比的高中频超外差 +零中频结构的射频前端。
本发明所采用的技术方案是： 一种高中频超外差 +零中频结构的射频前端， 有发射模块 和接收模块， 所述的接收模块包括有： 依次相连的用于接收发射模块所发射的信号的收发 天线、 低通滤波器、 超外差单元、 中频带通滤波器、 零中频单元、 数模转换器以及数字基 带模块， 所述的数字基带模块的输出连接发射模块。
所述的收发天线是通过无线开关连接低通滤波器。
所述的超外差单元包括有超外差混频器， 所述的超外差混频器的输入端分别连接低噪 声放大器和第一本振， 超外差混频器的输出端连接所述的中频带通滤波器的输入端， 所述 的低噪声放大器的输入端连接低通滤波器的输出端。 所述的零中频单元包括有依次相连的零中频混频器、 有源低通滤波器和可变增益运算 放大器， 其中， 所述的零中频混频器的输入端分别连接中频带通滤波器的输出端以及连接 第二本振， 所述的可变增益运算放大器的输出连接所述的数模转换器的输入端。
所述的发射模块包括有依次连接的调制混频器、 功率放大器驱动电路和功率放大器， 所述的调制混频器的输入端分别连接数字基带模块的输出端以及连接第三本振， 所述功率 放大器的输出连接收发天线的无线开关。
所述的超外差单元的输出频率设定为 2. 45 GHz的固定频率。
所述的第一本振的调谐范围为 1. 25GHz〜2. 35GHz。
本发明的高中频超外差 +零中频结构的射频前端， 第一中频定为 2. 45 GHz , 这有两个优 势： 1、 消除镜像干扰。 当输入射频信号频率为 100MHz〜1. 2GHz 时， 对应的镜像干扰频率 为 3. 7GHz〜4. 8GHz， 不在输入信号频带范围内， 避免了镜像干扰问题， 不需要镜像抑制滤 波器及中频滤波器， 可以提高系统的集成度， 降低系统功耗； 同时本振的调谐范围为 1. 25GHz〜2. 35GHz , 与传统超外差结构所需的 100MHz〜l. 2GHz的本振调谐范围相比， 中心 频率由 650MHz提高到 1. 8GHz , 调谐比由 85 %降低到 30 %， 大大降低了频率合成器设计的 难度， 故采用高中频超外差结构易实现。 2、 针对 2. 45GHz的中频信号的后续处理技术已很 成熟， 方案可行性高。 附图说明
图 1是典型超外差结构射频前端构成框图；
图 2是镜像干扰原理图；
图 3是本发明的高中频超外差 +零中频结构的射频前端构成框图。
图中，
1： 收发天线 2： 无线开关
3： 低通滤波器 4： 超外差单元
5： 中频带通滤波器 6： 零中频单元
7： 数模转换器 +数字基带单元 8： 发射模块
21： 射频带通滤波器 22： 低噪声放大器
23： 镜向干扰抑制波 24： 第一本振
25： 超外差混频器 26： 可变增益运算放大器
41： 低噪声放大器 42： 超外差混频器
43： 第一本振 61： 零中频混频器
62： 第二本振 63： 有源低通滤波器
64： 可变增益运算放大器 81： 调制混频器
82： 功率放大器驱动电路 83： 功率放大器
84： 第三本振 具体实施方式 下面结合实施例和附图对本发明的高中频超外差 +零中频结构的射频前端做出详细说 明。
本发明的高中频超外差 +零中频结构的射频前端， 包括有发射模块和接收模块， 接收模 块完成对射频信号的接收、 滤波、 上变频、 下变频和解调。 发射模块完成对基带信号的调 制和发射。 如图 3 所示， 所述的接收模块包括有： 依次相连的用于接收发射模块所发射的 信号的收发天线 1、 低通滤波器 3、 超外差单元 4、 中频带通滤波器 5、 零中频单元 6、 数模 转换器 7以及数字基带模块 8， 所述的数字基带模块 8的输出连接发射模块 9。 所述的收发 天线 1是通过无线开关 2连接低通滤波器 3。
所述的超外差单元 4包括有超外差混频器 42，所述的超外差混频器 42的输入端分别连 接低噪声放大器 41和第一本振 43， 超外差混频器 42的输出端连接所述的中频带通滤波器 5的输入端， 所述的低噪声放大器 41的输入端连接低通滤波器 3的输出端。 所述的该超外 差单元 4的超外差混频器 42的输出频率设定为 2. 45 GHz的固定频率， 所述的第一本振 43 的调谐范围为 1. 25GHz〜2. 35GHz。
所述的零中频单元 6包括有依次相连的零中频混频器 61、有源低通滤波器 63和可变增 益运算放大器 64， 其中， 所述的零中频混频器 61的输入端分别连接中频带通滤波器 5的输 出端以及连接第二本振 62， 所述的可变增益运算放大器 64的输出连接所述的数模转换器 7 的输入端。
所述的发射模块 9包括有依次连接的调制混频器 91、功率放大器驱动电路 92和功率放 大器 93，所述的调制混频器 91的输入端分别连接数字基带模块 8的输出端以及连接第三本 振 94， 所述功率放大器 93的输出连接收发天线 1的无线开关 2。
本发明的高中频超外差 +零中频结构的射频前端的接收模块的工作原理： 收发天线接收 射频信号， 其输出连接低通滤波器， 对射频信号进行低通滤波， 滤除干扰。 低通滤波器的 输出连接低噪声放大器， 对微弱的有用信号进行低噪声放大， 便于后续电路处理。 低噪声 放大器的输出和第一本振的输出连接到超外差混频器， 将信号上变频到第一中频 2. 45GHz 0 超外差混频器的输出连接到中频带通滤波器， 滤除干扰并进行信道选择。 中频带通滤波器 的输出和第二本振的输出连接到零中频混频器， 将第一中频信号下边频到数字电路可以处 理的低中频。 零中频混频器的输出连接有源低通滤波器， 滤除杂波。 有源低通滤波器的输 出连接可变增益运算放大器， 可变增益运算放大器的输出连接数模转换器 +数字基带单元 中的数模转换器 （A/D ) ， 对中频模拟信号转换为基带可以处理的数字信号， 然后， 数模转 换器的输出连接数字基带电路， 进行解调。
本发明的高中频超外差 +零中频结构的发射模块的工作原理： 数模转换器 +数字基带单 元中的数字基带电路的输出和第三本振的输出连接到调制混频器， 将基带信号调制到射频 频率。 调制混频器的输出连接到功率放大器驱动电路， 功率放大器驱动电路驱动功率放大 器， 提高发射功率。 功率放大器的输出连接发射天线。
本发明的高中频超外差 +零中频结构的发射模块中的第一中频设定为 2. 45 GHz的固定频 率。 当输入射频信号频率为 100MHz 〜1. 2GHz时， 对应的镜像干扰频率为 3. 7GHz〜4. 8GHz， 不在输入信号频带范围内， 很容易利用简单的低通滤波器滤除， 有效避免了镜像干扰问题， 提高系统的集成度， 降低系统功耗； 同时本振的调谐范围为 1.25GHz〜2.35GHz， 与传统超外 差结构所需的 113.56MHz〜 1213.56MHz 的本振调谐范围相比， 中心频率由 650MHz 提高到 1.8GHz，调谐比由 85%降低到 30%，大大降低了频率合成器设计的难度。另外，针对 2.45GHz 的中频信号的后续处理技术已很成熟， 方案可行性高。

Claims

权 利 要 求
1. 一种高中频超外差 +零中频结构的射频前端， 有发射模块和接收模块， 其特征在于， 所述的接收模块包括有： 依次相连的用于接收发射模块所发射的信号的收发天线 （1) 、 低 通滤波器 （3) 、 超外差单元 （4) 、 中频带通滤波器 （5) 、 零中频单元 （6) 、 数模转换 器 （7) 以及数字基带模块 （8) ， 所述的数字基带模块 （8) 的输出连接发射模块 （9) 。
2. 根据权利要求 1 所述的高中频超外差 +零中频结构的射频前端， 其特征在于， 所述 的收发天线 （1) 是通过无线开关 （2) 连接低通滤波器 （3) 。
3. 根据权利要求 1 所述的高中频超外差 +零中频结构的射频前端， 其特征在于， 所述 的超外差单元 （4) 包括有超外差混频器 （42) ， 所述的超外差混频器 （42) 的输入端分别 连接低噪声放大器 （41) 和第一本振 （43) ， 超外差混频器 （42) 的输出端连接所述的中 频带通滤波器 （5) 的输入端， 所述的低噪声放大器 （41) 的输入端连接低通滤波器 （3) 的输出端。
4. 根据权利要求 1 所述的高中频超外差 +零中频结构的射频前端， 其特征在于， 所述 的零中频单元 （6) 包括有依次相连的零中频混频器 （61) 、 有源低通滤波器 （63) 和可变 增益运算放大器 （64) ， 其中， 所述的零中频混频器 （61) 的输入端分别连接中频带通滤 波器 （5) 的输出端以及连接第二本振 （62) ， 所述的可变增益运算放大器 （64) 的输出连 接所述的数模转换器 （7) 的输入端。
5. 根据权利要求 1 所述的高中频超外差 +零中频结构的射频前端， 其特征在于， 所述 的发射模块 （9) 包括有依次连接的调制混频器 （91) 、 功率放大器驱动电路 （92) 和功率 放大器 （93) ， 所述的调制混频器 （91) 的输入端分别连接数字基带模块 （8) 的输出端以 及连接第三本振（94)， 所述功率放大器（93)的输出连接收发天线（1)的无线开关（2) 。
6. 根据权利要求 1 所述的高中频超外差 +零中频结构的射频前端， 其特征在于， 所述 的超外差单元 （4) 的输出频率设定为 2.45 GHz的固定频率。
7. 根据权利要求 3所述的高中频超外差 +零中频结构的射频前端， 其特征在于， 所述 的第一本振 （43) 的调谐范围为 1.25GHz〜2.35GHz。
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