CN104753557A - Wireless data transfer radio - Google Patents

Wireless data transfer radio Download PDF

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Publication number
CN104753557A
CN104753557A CN 201510127751 CN201510127751A CN104753557A CN 104753557 A CN104753557 A CN 104753557A CN 201510127751 CN201510127751 CN 201510127751 CN 201510127751 A CN201510127751 A CN 201510127751A CN 104753557 A CN104753557 A CN 104753557A
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radio
wireless
data
path
transfer
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CN 201510127751
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Chinese (zh)
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王春华
邓松茂
张海军
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深圳市华信天线技术有限公司
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Abstract

The invention discloses a wireless data transfer radio. The radio comprises a micro-control unit MCU, a modulator, a frequency synthesizer, a multi-band frequency power amplifier, A/D converter/demodulator, a mixer, a broadband low-noise amplifier, a first N path switch, a second N path switch, a 2N path switch, an emitting channel filter unit including N wave filters and a receiving channel filter unit including N wave filters. The wireless data transfer radio is small in volume, high in degree of integration, and simple in frequency band switching.

Description

无线数传电台 Wireless data radio

技术领域 FIELD

[0001] 本发明涉及通信设备领域,尤其涉及一种无线数传电台。 [0001] The present invention relates to the field of communications devices, and particularly to a wireless data radio.

背景技术 Background technique

[0002] 无线数传电台是指借助数字信号处理技术和无线电技术实现的高性能专业数据传输电台。 [0002] refers to wireless data radio station by means of high performance data transmission in digital signal processing technology and radio technology. 工业用无线数传电台已受到广泛应用,不过由于频谱资源的限制,传统的单频段无线数传电台逐渐被多频段无线电台所取代;而现有的多频段无线数传电台,是通过路由器和公共信道将几个单频段无线数传电台连接在一起,需要哪个频段,则路由器将信号传输给对应的电台进行传输;这种结构的多频段无线数传电台体积巨大,给应用带来了不便。 Industry has been widely used wireless data radio, but due to the limitations of spectrum resources, traditional single-band wireless data radio is gradually being replaced by multi-band radio stations; and the existing multi-band wireless data radio, through the router and public channel several single-band wireless data radio are connected together, which requires the band, the router sends the signal to the corresponding radio transmission; multi-band wireless data transfer such a structure a huge volume of radio, the inconvenience to the application.

发明内容 SUMMARY

[0003] 本发明的目的是,提供一种无线数传电台,以改善现有数传电台体积大,集成度不高的问题。 [0003] The object of the present invention is to provide a wireless data radio, digital radio to improve the existing large volume, high integration is not a problem.

[0004] 本发明公开了一种无线数传电台,上述电台包括微控制单元MCU、调制器、频率合成器、多频段功率放大器、A/D转换/解调器、混频器、宽带低噪声放大器、第一N路开关、第二N路开关、2N路开关、包括N个滤波器的发射通道滤波单元及包括N个滤波器的接收通道滤波单元,其中,N彡2,且 [0004] The present invention discloses a wireless data radio, the radio including the aforementioned micro control unit MCU, a modulator, a frequency synthesizer, multi-band amplifier, A / D converter / demodulator, mixers, low noise wideband amplifier, a first N-way switch, a second N-way switch, 2N-way switch, comprising N filter and the transmit channel filter unit comprising N filters receiving channel filtering means, wherein, San N 2, and

[0005] 上述调制器的输出端与上述频率合成器的输入端连接; [0005] The output of said modulator is connected to the input of the frequency synthesizer;

[0006] 上述频率合成器的一个输出端与上述多频段功率放大器的输入端连接,另一个输出端与上述混频器的一个输入端连接; [0006] An output of the frequency synthesizer and the input end of the multi-band power amplifier is connected to the other output terminal is connected to one input of said mixer;

[0007] 上述多频段功率放大器的输出端与上述第一N路开关的动端连接; [0007] The output terminal of the multi-band amplifier of the movable end of the first N-way switch is connected;

[0008] 上述第一N路开关的不动端分别与上述发射通道滤波单元中各滤波器的输入端连接; [0008] The first N-way switch fixed terminal connected to the emitter of the input channel filter unit of each filter;

[0009] 上述发射通道滤波单元中各滤波器的输出端分别与上述2N路开关的其中N个不动端连接; [0009] The transmit path output of the filter unit of each filter are identical to said 2N wherein the N-way switch fixed terminal;

[0010] 上述2N路开关的另外N个不动端分别与上述接收通道滤波单元中各滤波器的输入端连接;动端与天线连接; [0010] The channel switch 2N N other fixed terminal connected to the receiving means in the channel filtering each filter input; movable end connected to an antenna;

[0011] 上述接收通道滤波单元中各滤波器的输出端分别与上述第二N路开关的不动端连接; [0011] In the reception channel filter unit of each filter output terminal respectively N-way switch to the second fixed terminal;

[0012] 上述第二N路开关的动端与上述宽带低噪声放大器的输入端连接; [0012] The movable terminal of the second N-way switch is connected to the input terminal of the wideband low-noise amplifier;

[0013] 上述宽带低噪声放大器的输出端与上述混频器的输入端连接; [0013] The wideband low-noise amplifier with an input connected to the output end of the mixer;

[0014] 上述混频器的输出端与上述A/D转换/解调器的输入端连接; An output terminal [0014] The mixer and the A / D converter / demodulator connected to an input terminal;

[0015] 上述MCU分别与上述调制器、A/D转换/解调器、第一N路开关、第二N路开关及2N路开关连接,用于在发射状态时,控制上述调制器生成基带信号、同时根据待发射频段,控制上述第一N路开关及上述2N路开关的导通;以及在接收状态时,根据待接收频段,控制上述第二N路开关及上述2N路开关的。 [0015] The MCU said modulator, respectively, when the A / D converter / demodulator, a first N-way switch, and a second N-way switch 2N-way switch connected to the transmitting state, controlling said modulator generates a baseband signal, while the frequency band to be transmitted according to the control of the first N-way switch and said switch conduction path 2N; and upon receiving state, in accordance with the frequency band to be received, controls the second N-way switch and said 2N-way switches.

[0016] 优选地,上述第一N路开关、第二N路开关、2N路开关均为射频开关。 [0016] Preferably, the first N-way switch, a second N-way switch, 2N-way switches are RF switches.

[0017] 优选地,上述发射通道滤波单元中各滤波器均为低通滤波器;上述接收通道滤波单元中各滤波器均为带通滤波器。 [0017] Preferably, the transmit channel filter unit of each filter are low pass filter; and the filtering unit of each receive channel filters are bandpass filters.

[0018] 本发明的无线数传电台可工作在包括UHF频段(410-470MHZ)、VHF频段(220-240MHz)等多个频段,并且体积小、集成度高、频段切换简单。 [0018] The radio digital radio of the invention can operate in, the VHF band (220-240MHz) comprising a like plurality of frequency bands UHF band (410-470MHZ), and the small size, high integration, simple band switching.

附图说明 BRIEF DESCRIPTION

[0019] 此处所说明的附图用来提供对本发明的进一步理解,构成本发明的一部分,本发明的示意性实施例及其说明用于解释本发明,并不构成对本发明的不当限定。 [0019] The drawings described herein are provided for further understanding of the present invention, constituting part of the invention, exemplary embodiments of the present invention are used to explain the present invention without unduly limiting the present invention. 在附图中: In the drawings:

[0020] 图1是本发明无线数传电台的原理框图; [0020] FIG. 1 is a block diagram of a wireless data transmitter according to the present invention;

[0021] 图2是本发明无线数传电台可工作在220-240MHZ与410_470ΜΗζ频段时的实施例原理框图。 [0021] FIG. 2 is a wireless data transmission of the present invention can work station block diagram of an embodiment of the band when the 220-240MHZ 410_470ΜΗζ.

具体实施方式 detailed description

[0022] 为了使本发明所要解决的技术问题、技术方案及有益效果更加清楚、明白,以下结合附图和实施例,对本发明进行进一步详细说明。 [0022] In order to make the technical problem to be solved by the present invention, technical solutions and beneficial effects more clearly understand, in conjunction with the accompanying drawings and the following embodiments, the present invention will be further described in detail. 应当理解,此处所描述的具体实施例仅用以解释本发明,并不用于限定本发明。 It should be understood that the specific embodiments described herein are merely used to explain the present invention and are not intended to limit the present invention.

[0023] 如图1所示,是本发明无线数传电台的原理框图,包括MCU 01、调制器02、频率合成器03、多频段功率放大器04、A/D转换/解调器05、混频器06、宽带低噪声放大器07、第一N路开关08、第二N路开关09、2Ν路开关10、包括N个滤波器的发射通道滤波单元11及包括N个滤波器的接收通道滤波单元12,其中,N多2,且 [0023] As shown in FIG 1, is a schematic block diagram of a wireless data transmitter according to the present invention, comprises a MCU 01, a modulator 02, frequency synthesizer 03, a multi-band power amplifier 04, A / D converter / demodulator 05, mix frequency 06, wideband low noise amplifier 07, a first N-way switch 08, a second N-way switch 10 switch 09,2Ν path, comprising N filters transmit channel and a receiver channel filtering unit 11 filtering the N filters comprising unit 12, wherein, N number 2, and

[0024] 调制器02的输出端与频率合成器03的输入端连接; [0024] The input of the modulator 02 and the output terminal 03 is connected to the frequency synthesizer;

[0025] 频率合成器03的一个输出端与多频段功率放大器04的输入端连接,另一个输出端与混频器06的输入端连接; [0025] The output of the frequency synthesizer 03 and a multi-band power amplifier is connected to an input terminal 04, the other input terminal of the output terminal of the mixer 06 is connected;

[0026] 多频段功率放大器04的输出端与第一N路开关08的动端连接; [0026] The multi-band power amplifier 04 and the output terminal of the first N-way switch 08 is connected to the movable end;

[0027] 第一N路开关08的不动端分别与发射通道滤波单元11中各滤波器的输入端连接;即一个不动端连接一个滤波器的输入端;总共N组连接; [0027] The first N-way switch 08 Fixed terminal connected to the input of each filter in the filter unit 11 transmit channel; i.e., an input terminal connected to a movable end of the filter; N total set of connections;

[0028] 发射通道滤波单元11中N个滤波器的输出端分别与2Ν路开关10的其中N个不动端连接;即每个滤波器的输出端均与2Ν路开关的其中一个不动端连接;总共N组连接,其他同理; [0028] transmit channel filter unit 11 filters the output terminal respectively N 2Ν wherein the N-way switch 10 is connected to the fixed end; i.e., the output of each filter average 2Ν way switches and wherein a stationary terminal connection; a total of N sets are connected, the other empathy;

[0029] 2Ν路开关10的另外N个不动端分别与接收通道滤波单元12中各滤波器的输入端连接;动端与天线连接; N other stationary terminal 12 are connected to the input of each receive channel filter filtering unit [0029] 2Ν channel switch 10; a movable terminal connected to an antenna;

[0030] 接收通道滤波单元12中各滤波器的输出端分别与第二N路开关09的不动端连接; [0030] Channel Filter unit 12 receives the output of each filter, respectively a second N-way switch 09 fixed terminal;

[0031] 第二N路开关09的动端与宽带低噪声放大器07的输入端连接; [0031] The second N-way switch 09 the movable end of the wideband low-noise amplifier 07 is connected to an input terminal;

[0032] 宽带低噪声放大器07的输出端与混频器06的输入端连接; [0032] The input terminal of the output terminal of the wideband low-noise amplifier 07 and the mixer 06 is connected;

[0033] 混频器06的输出端与A/D转换/解调器05的输入端连接; An output terminal [0033] The mixer 06 and A / D converter / demodulator input terminal 05 is connected;

[0034] MCUOl分别与调制器02、A/D转换/解调器05、第一N路开关08、第二N路开关09及2N路开关10连接,用于在发射状态时,控制调制器02生成基带信号、同时根据待发射频段,控制第一N路开关08及2N路开关10的导通;以及在接收状态时,根据待接收频段,控制第二N路开关09及2N路开关10的导通;本发明中,发射通路及接收通路的每个滤波器,均分别负责对一个频段的信号进行滤波。 [0034] MCUOl respectively modulator 02, A / D converter / demodulator 05, a first N-way switch 08, the second N-way switch 09 and the switch 10 is connected 2N passage for emission state, controls the modulator 02 generates a baseband signal, while according to the frequency band to be transmitted, the control of the first N-way switch 08 and the switch 10 is turned 2N passage; and upon receiving state, in accordance with the frequency band to be received, the control switch 09 and the second N-way switch 10 path 2N conduction; the present invention, the transmission path and receive path of each filter, respectively, are responsible for filtering the signal of a frequency band.

[0035] 如图2所示,是本发明无线数传电台可工作在220-240MHZ与410_470MHz频段时的实施例原理框图;也就是说,本实施例电台只能工作在220-240MHZ与410_470MHz频段,如图所示,包括MCU 01、调制器02、频率合成器03、多频段功率放大器04、A/D转换/解调器 [0035] FIG. 2 is a wireless data radio can operate in the present invention is a functional block diagram of Example 220-240MHZ embodiment when bands 410_470MHz; That is, embodiments of the present embodiment can work only in radio and 410_470MHz band 220-240MHZ , as shown, comprises a MCU 01, a modulator 02, frequency synthesizer 03, a multi-band power amplifier 04, A / D converter / demodulator

05、混频器06、宽带低噪声放大器07、第一单刀双掷开关080、第二单刀双掷开关090、单刀四掷开关100、第一滤波器110、第二滤波器111、第三滤波器120及第四滤波器121,第一滤波器110和第二滤波器111组成发射通道滤波单元11 ;第三滤波器120及第四滤波器121组成接收通道滤波器单元12 ;本实施例中,第一滤波器110、第二滤波器111为低通滤波器;第三滤波器120、第四滤波器121为带通滤波器;第一单刀双掷开关080、第二单刀双掷开关090、单刀四掷开关100均为射频开关;其中, 05, a mixer 06, the broadband low noise amplifier 07, a first SPDT switch 080, the second SPDT switch 090, a single-pole four-throw switch 100, a first filter 110, a second filter 111, third filter 120 and a fourth filter 121, a first filter 110 and second filter 111 composed of the transmission channel filter unit 11; the third filter 121. the filter 120 and the fourth receiving channel filter unit 12; the present embodiment , the first filter 110, second filter 111 is a low pass filter; a third filter 120, a fourth filter 121 is a bandpass filter; a first SPDT switch 080, the second SPDT switch 090 , single-pole four-throw switch 100 are radio frequency switch; wherein,

[0036] 调制器02的输出端与频率合成器03的输入端连接; [0036] The input of the modulator 02 and the output terminal 03 is connected to the frequency synthesizer;

[0037] 频率合成器03的一个输出端与多频段功率放大器04的输入端连接,另一个输出端与混频器06的输入端连接; [0037] The output of the frequency synthesizer 03 and a multi-band power amplifier is connected to an input terminal 04, the other input terminal of the output terminal of the mixer 06 is connected;

[0038] 多频段功率放大器04的输出端与第一单刀双掷开关080的动端连接; [0038] The multi-band power amplifier 04 and the output terminal of the first SPDT switch 080 is connected to the movable end;

[0039] 第一单刀双掷开关080的不动端分别与第一滤波器110及第二滤波器1111的输入端连接; [0039] The first SPDT switch 080 Fixed terminal connected to the input terminal 110 and the second filter 1111 of the first filter;

[0040] 第一滤波器110及第二滤波器111的输出端分别与单刀四掷开关100的其中两个不动端连接; An output terminal [0040] The first filter 110 and the second filter 111 are single-pole four-throw switch and wherein the two fixed ends 100 of the connector;

[0041] 单刀四掷开关100的另外两个不动端分别与第三滤波器120及第四滤波器121的输入端连接;动端与天线连接; [0041] The single-pole four-throw switch 100. The other two fixed ends are connected to the input of the third filter 120 and fourth filter 121; a movable end connected to an antenna;

[0042] 第三滤波器120及第四滤波器121的输出端分别与第二单刀双掷开关090的不动端连接; [0042] 120 and the output of the fourth filter 121, respectively, a third filter and the second SPDT switch 090 connected to the fixed end;

[0043] 第二单刀双掷开关090的动端与宽带低噪声放大器07的输入端连接; [0043] The second SPDT switch 090 and the movable end of the wideband low-noise amplifier 07 is connected to an input terminal;

[0044] 宽带低噪声放大器07的输出端与混频器06的输入端连接; [0044] The input terminal of the output terminal of the wideband low-noise amplifier 07 and the mixer 06 is connected;

[0045] 混频器06的输出端与A/D转换/解调器05的输入端连接; An output terminal [0045] The mixer 06 and the A / D converter / demodulator input terminal 05 is connected;

[0046] MCU 01分别与调制器02、A/D转换/解调器05、第一单刀双掷开关080、第二单刀双掷开关090及单刀四掷开关100连接,用于在发射状态时,控制调制器02生成基带信号、同时根据待发射频段,控制第一单刀双掷开关080单刀四掷开关100的导通;以及在接收状态时,根据待接收频段,控制第二单刀双掷开关090及单刀四掷开关100的连接状态。 When [0046] MCU 01 respectively, a modulator 02, A / D converter / demodulator 05, a first SPDT switch 080, the second SPDT switch 090 and the single-pole four-throw switch 100 is connected, for transmitting status , controls the modulator 02 to generate a baseband signal, while according to the frequency band to be transmitted, the control of the first SPDT switch 080 single-pole four-throw switch 100 is turned on; and upon receiving state, in accordance with the frequency band to be received, the second SPDT switch control single-pole four-throw switches 090 and 100 to the connected state.

[0047] 当电台处于发射状态时,MCU 01控制调制器02产生基带信号,同时根据当前所要发射频段,控制第一单刀双掷开关080及单刀四掷开关100的导通状态,组成射频发射信道;调制器02将生成的基带信号发送给频率合成器03 ;频率合成器03产生发射频段的射频信号,并将射频信号送至多频段功率放大器04 ;多频段功率放大器04对射频信号进行放大,之后根据不同的发射频段,放大后的射频信号经过不同的滤波器滤除功放产生的谐波,再传输给天线发射出去。 [0047] When the station is in transmit state, MCU 01 controls the modulator 02 to generate a baseband signal, while according to the current to be transmitted band, the control of the first single-pole double-throw switch 080 and a single-pole four-throw ON state of the switch 100, the composition of the RF transmission channel ; modulator 02 generates the baseband signals to the frequency synthesizer 03; a radio frequency signal of the frequency synthesizer 03 generates a transmission band, and the multi-band RF signal to the power amplifier 04; multi-band power amplifier 04 amplifies the RF signal, after depending on the transmit band, the RF signal amplified through the various filters filter out harmonics generated by the power amplifier, and then transmitted to the antenna out.

[0048] 当电台处于接收状态时,MCU 01控制第二单刀双掷开关090及单刀四掷开关100的导通状态,组成射频接收信道;天线接收射频信号,经第三滤波器120或者第四滤波器121滤波、宽带低噪声放大器07放大后,在混频器06处进行混频处理,混频器06的本振信号由频率合成器03产生,接收的射频信号经混频后变为基带信号,再由A/D转换/解调器05变换后进行数字解调,并送至MCU 01,完成信号的接收解调。 [0048] When the radio is in a receive state, MCU 01 controls the second switch 090 and the single-pole double-throw single-pole four throw switch 100 to a conducting state, the composition of a radio frequency receiver channels; antenna receiving RF signals, via the third or fourth filter 120 filter 121 filtering the wideband low-noise amplifier 07 amplifies, mixes processing mixer 06, the local oscillator signal of the mixer 06 is generated by the frequency synthesizer 03, the received RF signal becomes a baseband frequency mixing signal, then the a / D converter / demodulator 05 after converted digital demodulation and sent to MCU 01, receives the demodulated signal is completed.

[0049] 上述说明示出并描述了本发明的优选实施例,但如前所述,应当理解本发明并非局限于本文所披露的形式,不应看作是对其他实施例的排除,而可用于各种其他组合、修改和环境,并能够在本文所述发明构想范围内,通过上述教导或相关领域的技术或知识进行改动。 [0049] The above description of the embodiments illustrated and described preferred embodiments of the present invention, as previously discussed, it should be understood that the invention is not limited to the form disclosed herein should not be considered as excluding other embodiments, the available in various other combinations, modifications, and environments, and can be within the scope of the invention contemplated herein, or make changes to the above teachings in skill or knowledge of the relevant art. 而本领域人员所进行的改动和变化不脱离本发明的精神和范围,则都应在本发明所附权利要求的保护范围内。 The modifications and variations carried out by the skilled person without departing from the spirit and scope of the invention shall fall within the scope of the appended claims of the invention.

Claims (3)

  1. 1.一种无线数传电台,其特征在于,所述电台包括微控制单元MCU、调制器、频率合成器、多频段功率放大器、A/D转换/解调器、混频器、宽带低噪声放大器、第一N路开关、第二N路开关、2N路开关、包括N个滤波器的发射通道滤波单元及包括N个滤波器的接收通道滤波单元,其中,N彡2,且所述调制器的输出端与所述频率合成器的输入端连接; 所述频率合成器的一个输出端与所述多频段功率放大器的输入端连接,另一个输出端与所述混频器的一个输入端连接; 所述多频段功率放大器的输出端与所述第一N路开关的动端连接; 所述第一N路开关的不动端分别与所述发射通道滤波单元中各滤波器的输入端连接;所述发射通道滤波单元中各滤波器的输出端分别与所述2N路开关的其中N个不动端连接; 所述2N路开关的另外N个不动端分别与所述接收通道滤波单元中各 A wireless data radio, wherein, said station comprising a micro control unit MCU, a modulator, a frequency synthesizer, multi-band amplifier, A / D converter / demodulator, mixers, low noise wideband amplifier, a first N-way switch, a second N-way switch, 2N-way switch, comprising N filter and the transmit channel filter unit comprising N filters receiving channel filtering means, wherein, San N 2, and the modulation an output terminal of said frequency synthesizer and an input terminal; a frequency synthesizer connected to an output of said input multi-band power amplifier, an input of the other output of the mixer connection; movable end of the multi-band power amplifier output terminal and the first N-way switch is connected; fixed end of the first N-channel switch are input to the transmit path and the filter unit of each filter connector; output of the transmit path of each filter in the filter unit are the 2N wherein the N-way switch fixed terminal; 2N-way switches of the N other ends are fixed to the receiving channel filter each unit 波器的输入端连接;动端与天线连接; 所述接收通道滤波单元中各滤波器的输出端分别与所述第二N路开关的不动端连接; 所述第二N路开关的动端与所述宽带低噪声放大器的输入端连接; 所述宽带低噪声放大器的输出端与所述混频器的输入端连接; 所述混频器的输出端与所述A/D转换/解调器的输入端连接; 所述MCU分别与所述调制器、A/D转换/解调器、第一N路开关、第二N路开关及2N路开关连接,用于在发射状态时,控制所述调制器生成基带信号、同时根据待发射频段,控制所述第一N路开关及所述2N路开关的导通;以及在接收状态时,根据待接收频段,控制所述第二N路开关及所述2N路开关的导通。 Input of the multiplexer is connected; movable terminal connected to an antenna; receiving the output of the channel filter unit of each filter, respectively the second N-way switch fixed terminal; the second N-way switch movable input terminal of the wideband low-noise amplifier is connected; input the output of the wideband low noise amplifier connected to said mixer; the output of the mixer and the a / D conversion / solution demodulator is connected to an input terminal; a modulator of the MCU, respectively, a / D converter / demodulator, a first N-way switch, and a second N-way switch connected to 2N-way switch, for, when transmitting state, controlling the modulator to generate a baseband signal, while according to the frequency band to be transmitted, controlling the first N-way switch is turned on and the 2N-way switches; and upon receiving state, in accordance with the frequency band to be received, to control the second N 2N passage way switch and the switch is turned on.
  2. 2.如权利要求1所述的无线数传电台,其特征在于,所述第一 N路开关、第二N路开关、2N路开关均为射频开关。 2. The number of the wireless radio modem of claim 1, wherein the first N-way switch, a second N-way switch, 2N-way switches are RF switches.
  3. 3.如权利要求1或2所述的无线数传电台,其特征在于,所述发射通道滤波单元中各滤波器均为低通滤波器;所述接收通道滤波单元中各滤波器均为带通滤波器。 3. The wireless data radio as claimed in claim 1 or 2, wherein said transmit path of each filtering unit filters are low-pass filters; said filtering unit of each receive channel filter are band pass filter.
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CN105429648A (en) * 2015-11-09 2016-03-23 武汉中元通信股份有限公司 Channel switching module based on VHF/UHF double-frequency radio station
CN106253865A (en) * 2016-08-01 2016-12-21 上海华虹宏力半导体制造有限公司 Multi-band radio frequency power amplifier

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CN101094480A (en) * 2007-07-26 2007-12-26 中兴通讯股份有限公司 Circuit structure for improving influence on CDMA sensitivity from GSM switch in dual modes handset
CN101442330A (en) * 2008-12-09 2009-05-27 中兴通讯股份有限公司 Radio frequency circuit and CDMA mobile terminal

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JPH06132847A (en) * 1992-10-21 1994-05-13 Fuji Electric Co Ltd Trasmitting/receiving frequency band switching radio communication equipment
US20060046787A1 (en) * 2004-08-31 2006-03-02 Research In Motion Limited Mobile wireless communications device with reduced interfering energy from the display and related methods
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CN105429648A (en) * 2015-11-09 2016-03-23 武汉中元通信股份有限公司 Channel switching module based on VHF/UHF double-frequency radio station
CN106253865A (en) * 2016-08-01 2016-12-21 上海华虹宏力半导体制造有限公司 Multi-band radio frequency power amplifier

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