Frequency mixer of mobile communication system

专利摘要:
PURPOSE: A frequency mixer of a mobile communication system is provided to increase a phase noise and sensibility of a local oscillating frequency generator by preventing a signal supplied to the local oscillating frequency generator from a receiving circuit. CONSTITUTION: A frequency mixer of a mobile communication system comprises a local oscillating frequency generator(111), an amplifier(109), an attenuator(125), and a high gain amplifier. The amplifier(109) outputs to a down converter(107) of a receiving circuit(110) by amplifying a local oscillating signal outputted from the local oscillating frequency generator(111). The attenuator(125) sets off a received signal supplied to the generator(111) from an up converter(115), by being connected between the generator(111) and the up converter(115) of the receiving circuit(110). The high gain amplifier amplifies and outputs the local oscillating frequency to a high gain. The local oscillating frequency outputted from the generator(111) becomes weak by being influenced by the attenuator(125), if the received signal is set off in the attenuator(125). The high gain amplifier(127) amplifies the local oscillating frequency to the high gain for compensating the weaken local oscillating frequency, to output into the up converter(115).
公开号:KR20000044512A
申请号:KR1019980061011
申请日:1998-12-30
公开日:2000-07-15
发明作者:김원경
申请人:윤종용；삼성전자 주식회사；
IPC主号:

专利说明:

Frequency Synthesizer of Mobile Communication System
The present invention relates to a local oscillation device of a mobile communication system, and more particularly, to a local oscillation device for improving the transmission and reception separation.
In general, a mobile communication system includes a frequency synthesizer for converting a radio frequency signal into an intermediate frequency signal or an intermediate frequency signal into a radio frequency signal. In general, a super heterodyne (Super Hetero Dyne) method is used as the frequency synthesis method. When using the same local oscillation frequency for transmitting and receiving, the frequency synthesizing apparatus supplies a transmitting / receiving local oscillation frequency signal to a transmitter and a receiver simultaneously using one voltage controlled oscillator (VCO).
1 is a block diagram illustrating a transceiver of a general mobile communication system, which will be described in detail with reference to the drawing.
In general, the transceiver includes a duplexer 101 that separates a radio frequency signal transmitted and received through an antenna, and converts a radio frequency signal output from the duplexer 101 into an intermediate frequency signal by receiving a predetermined local oscillation frequency. Receiving unit 110 for outputting to a base band analog (BBA-not shown) section, and a transmission unit for receiving the intermediate frequency output from the baseband analog unit, the local oscillation frequency is converted into a radio frequency and output And a frequency synthesizer 130 for generating and outputting a local oscillation frequency to the receiver 110 and the transmitter 120.
The receiver 110 low noise amplifies a weakly received wireless signal from the duplexer 101 to output an optimal wireless signal, and a wireless signal output from the low noise amplifier 103. A band filter for band filtering and a down converter 107 for receiving the filtered radio signal and the local oscillation frequency output from the frequency synthesizing unit 130 and outputting an intermediate frequency signal.
The transmitter 120 synthesizes an intermediate frequency signal input from a baseband analog unit and a local oscillation frequency output from the frequency synthesizer 130 to output a radio frequency signal, and the up converter ( Band amplifier 117 for band-filtering the radio frequency signal output from 115 and a drive amplifier for amplifying the filtered radio signal output from the band filter 117 to be sufficiently amplified in a power amplifier 123 to be described later 119, a band filter 121 for band-filtering the radio signal output from the drive amplifier 119, and a power amplifier 123 for amplifying the radio signal output from the band filter 121 for transmission in the air. It is composed of
The frequency synthesizer 130 includes a local frequency generator 111 for generating and outputting a local oscillation frequency, a buffer 109 for amplifying and outputting a local oscillation frequency provided to the down converter 107, and And a buffer 113 for amplifying and outputting the local oscillation frequency output to the converter 115.
As described above, the local oscillation frequency is supplied to the receiver 110 and the transmitter 120 using one local frequency generator 111. At this time, a phenomenon in which the transmission signal is induced in the reception path occurs because a strong transmission signal affects the receiver 110 by the local oscillation frequency supply path.
As described above, since the strong transmission signal is induced in the reception path, the phase noise and the sensitivity of the local oscillation frequency generator are worsened, thereby degrading the overall call quality.
Accordingly, an object of the present invention is to provide a frequency synthesizing apparatus for blocking a signal induced by a local oscillation frequency generator in a transmitter.
In order to achieve the above object, the present invention provides a frequency synthesizer having a local oscillation frequency generator for generating and outputting a local oscillation frequency with a transmitter, a receiver, and is connected between the transmitter and the local oscillation frequency generator to be induced in the transmitter. And a high gain amplifier that receives the local oscillation frequency through the attenuator and amplifies it with high gain.
1 is a block diagram illustrating a transceiver of a general mobile communication system.
2 is a block diagram illustrating a transmission and reception unit according to an exemplary embodiment of the present invention.
Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. First, in adding reference numerals to the components of each drawing, it should be noted that the same reference numerals have the same reference numerals as much as possible even if displayed on different drawings. In the following description of the present invention, if it is determined that a detailed description of a related known function or configuration may unnecessarily obscure the subject matter of the present invention, the detailed description thereof will be omitted.
The frequency synthesizer according to the present invention includes an attenuator for canceling a transmission signal induced by the transmitter 120 and a high gain amplifier for amplifying a local oscillation frequency signal input through the attenuator with a high gain. The configuration and operation of the present invention by the above configuration will be described with reference to FIG. In FIG. 2, since the configuration and operation of the transmitter 120 and the receiver 110 are the same as in the related art, description thereof will be omitted.
The frequency synthesizer 140 according to the present invention amplifies the local oscillation frequency generator 111 and the local oscillation frequency output from the local oscillation frequency generator 111 to output the down converter 107 of the receiver 110. A transmission signal connected between the amplifier 109 and the local oscillation frequency generator 111 and the up converter 115 of the transmitter 120 to be induced from the up converter 115 to the local oscillation frequency generator 111. The attenuator 125 cancels and a high gain amplifier amplifies and outputs the local oscillation frequency inputted through the attenuator 125 with a high gain. When the attenuator 125 attenuates the transmission signal, the local oscillation frequency output from the local oscillation frequency generator 111 is also weakened by the attenuator 125. To compensate for the weakened local oscillation frequency, the high gain amplifier 127 amplifies the local oscillation frequency with a high gain and outputs it to the up converter 115 of the transmitter 120.
As described above, the present invention has the advantage of improving the phase noise and sensitivity of the local oscillation frequency generator by improving the transmission and reception separation of the local oscillation frequency path.

权利要求:
Claims (1)
[1" claim-type="Currently amended] A frequency synthesizing apparatus comprising a transmitter, a receiver, and a local oscillation frequency generator for generating and outputting a local oscillation frequency,
An attenuator connected between the transmitter and the local oscillation frequency generator to cancel a transmission signal induced by the transmitter;
And a high gain amplifier which receives the local oscillation frequency through the attenuator and amplifies and outputs the local oscillation frequency with a high gain.

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同族专利:

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公开号 | 公开日

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KR100584441B1|2006-08-11|

引用文献:

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公开号 | 申请日 | 公开日 | 申请人 | 专利标题

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法律状态:
1998-12-30|Application filed by 윤종용, 삼성전자 주식회사

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1998-12-30|Priority to KR1019980061011A

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2000-07-15|Publication of KR20000044512A

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2006-08-11|Application granted

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2006-08-11|Publication of KR100584441B1

优先权:

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申请号 | 申请日 | 专利标题

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KR1019980061011A|KR100584441B1|1998-12-30|1998-12-30|Frequency Synthesizer of Mobile Communication System|