KR100319401B1 - Frequency converter for 2.4~2.5GHz band receiver - Google Patents
Frequency converter for 2.4~2.5GHz band receiver Download PDFInfo
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- KR100319401B1 KR100319401B1 KR1019990028475A KR19990028475A KR100319401B1 KR 100319401 B1 KR100319401 B1 KR 100319401B1 KR 1019990028475 A KR1019990028475 A KR 1019990028475A KR 19990028475 A KR19990028475 A KR 19990028475A KR 100319401 B1 KR100319401 B1 KR 100319401B1
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Abstract
가. 청구범위에 기재된 발명이 속하는 기술분야.end. The technical field to which the invention described in the claims belongs.
본 발명은 슈퍼헤테로다인 수신기(Supherheterodyne receiver)의 주파수 변환기에 관한 것으로서, 특히 수신 주파수가 2.4GHz∼2.5GHz대역의 고주파를 변환하여 증폭이 용이한 중간 주파수(IF:450kHz∼455kHz)로 만들기 위한 방법에 관한 것이다.BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a frequency converter of a superheterodyne receiver, and in particular, a method for converting a high frequency in the 2.4 GHz to 2.5 GHz band into an intermediate frequency (IF: 450 kHz to 455 kHz) that is easily amplified. It is about.
나. 발명이 해결하려는 기술적 과제.I. The technical problem to be solved by the invention.
종래의 2중 슈퍼헤테로다인 수신기(Double Superheterodyne receiver)는 30∼300MHz인 VHF(Very High Frequency)의 신호를 중간주파수로 만들기 위해서 수정발진기와 주파수 체배기를 이용하여 국부발진부를 형성하고 이를 1차 주파수 혼합기와 2차 주파수 혼합기의 발진주파수로 각각 입력함으로서 수신된 VHF신호를 중간주파수로 만든다. 하지만 수신 주파수가 UHF(Ultra High Frequency)인 경우, 특히 2.4∼2.5GHz일 경우, 상기와 같은 방법으로는 중간주파수(IF:450kHz∼455kHz)를 만들 수 없는 단점이 있다.Conventional double superheterodyne receiver (Double Superheterodyne receiver) to form a local oscillator using a crystal oscillator and a frequency multiplier to make the VHF (Very High Frequency) signal of 30 ~ 300MHz into an intermediate frequency and the primary frequency mixer The input VHF signal is made into the oscillation frequency of and the 2nd frequency mixer, respectively, to make the intermediate frequency. However, when the reception frequency is UHF (Ultra High Frequency), especially 2.4 to 2.5GHz, there is a disadvantage that the intermediate frequency (IF: 450kHz to 455kHz) can not be made by the above method.
다. 발명의 해결방법의 요지.All. Summary of the Solution of the Invention.
따라서 본 발명은 상기에 제시된 문제를 해결하기 위해서 국부발진부를 PLL(Phasor Locked Loop)을 이용하고, 수신된 주파수 변환을 종래에는 2차까지 하여 주파수를 낮추던 것을 3차까지 변환토록 함으로서 증폭이 용이한 중간주파수(IF:450kHz∼455kHz)로 변환하기 위한 것이다.Therefore, the present invention uses a PLL (Phasor Locked Loop) PLL to solve the problems presented above, and the amplification is easy by converting the received frequency conversion to the second to the third by lowering the frequency. This is for converting to an intermediate frequency (IF: 450kHz to 455kHz).
라. 발명의 중요한 용도la. Important uses of the invention
주파수 혼합기.Frequency mixer.
Description
본 발명은 슈퍼헤테로다인 수신기(Supherheterodyne receiver)의 주파수 변환기에 관한 것으로서, 특히 수신 주파수가 2.4∼2.5GHz대역의 고주파를 변환하여 증폭이 용이한 중간 주파수(IF:450kHz∼455kHz)로 만들기 위한 방법에 관한 것이다.BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a frequency converter of a superheterodyne receiver, and more particularly to a method for converting a high frequency in the 2.4 to 2.5 GHz band into an intermediate frequency (IF: 450 kHz to 455 kHz) that is easily amplified. It is about.
종래의 2중 슈퍼헤테로다인 수신기(Superheterodyne receiver)는 30∼300MHz인 VHF(Very High Frequency)의 신호를 중간주파수로 만들기 위해서 수정발진기와 주파수 체배기를 이용하여 국부발진부를 형성하고 이를 1차 주파수 혼합기와 2차 주파수 혼합기의 발진주파수로 각각 입력함으로서 수신된 VHF신호를 중간주파수로 만든다. 하지만 수신 주파수가 UHF(Ultra High Frequency)인 경우, 특히 2.4∼2.5GHz일 경우, 상기와 같은 방법을 이용하면 주파수 혼합기에서 안테나를 통해 주파수 혼합기로 입력되는 입력주파수와 국부발진부의 수정발진기에서 발진하는 발진입력주파수의 차를 갖는 주파수를 출력하게 되는데 이때 주파수 혼합기로 입력된 입력주파수에 비해서 발진주파수의 크기가 너무 미세하기 때문에 원활히 중간주파수(IF:450kHz∼455kHz)를 만들 수 없는 단점이 있다.In the conventional dual superheterodyne receiver (Superheterodyne receiver) to form a local oscillator using a crystal oscillator and a frequency multiplier to make a VHF (Very High Frequency) signal of 30 ~ 300MHz to an intermediate frequency, it is a first frequency mixer By inputting the oscillation frequency of the secondary frequency mixer, the received VHF signal is made into the intermediate frequency. However, when the reception frequency is UHF (Ultra High Frequency), especially 2.4 ~ 2.5GHz, using the above method, the oscillator oscillates in the crystal oscillator and the input frequency input from the frequency mixer to the frequency mixer through the antenna. The frequency with the difference of the oscillation input frequency is output. At this time, since the size of the oscillation frequency is too fine compared to the input frequency input to the frequency mixer, there is a disadvantage in that the intermediate frequency (IF: 450kHz to 455kHz) cannot be made smoothly.
따라서 본 발명은 상기에 제시된 문제를 해결하기 위해서 국부발진부를 PLL(Phasor Locked Loop)을 이용하고, 수신된 주파수 변환을 종래에는 2차까지 하여 주파수를 낮추던 것을 3차까지 변환토록 함으로서 증폭이 용이한 중간주파수(IF:450kHz∼455kHz)로 변환하기 위한 것이다.Therefore, the present invention uses a PLL (Phasor Locked Loop) PLL to solve the problems presented above, and the amplification is easy by converting the received frequency conversion to the second to the third by lowering the frequency. This is for converting to an intermediate frequency (IF: 450kHz to 455kHz).
도1은 무선수신기의 주파수 변환기 블록다이어그램1 is a block diagram of a frequency converter of a radio receiver
<도면의주요부분에대한부호의설명>Explanation of symbols on the main parts of the drawing
A:1차 주파수 혼합기 B:2차 주파수 혼합기A: 1st frequency mixer B: 2nd frequency mixer
C:FM IF I.C D:V.C.OC: FM IF I.C D: V.C.O
E:PLL I.C F:수정발진기E: PLL I.C F: Crystal Oscillator
G:주파수 체배기 H:분주기G: Frequency multiplier H: Divider
I:CPU K:L.P.FI: CPU K: L.P.F
10:국부발진부10: local oscillation department
이하에서는 첨부도면을 참조로 하여 본 발명의 구성 및 작용을 일 실시 예를 들어가며 상세히 설명하기로 한다.Hereinafter, with reference to the accompanying drawings, the configuration and operation of the present invention will be described in detail with reference to an embodiment.
우선 본 발명의 구성을 살펴보면 도1에서 보는바와 같이 1,2차 주파수 혼합기(A,B)와 3차 주파수 변환을 하여 최종 중간주파수(IF:450kHz∼455kHz)를 만드는 FM IF I.C(C)와 중간주파수를 만들기 위해 1,2차 혼합기(A,B)와 FM IF I.C(C)로 발진주파수를 입력하는 국부발진부(10)로 구성되어 있다.이때 국부발진부(10)는 PLL(Phasor Locked Loop)로서 V.C.O(Voltage Control Oscillator)(D)와 L.P.F(Low Pass Filter)(K)와 PLL I.C(E)의 참조 신호를 발진하는 수정발진기(F)와 PLL I.C(E)와 CPU(I)로 구성되어 V.C.O(D)를 제어하여 V.C.O(D)에서 출력하는 안정적인 고주파를 1,2차 혼합기(A,B)의 발진입력주파로 사용하고, 수정발진기(F)의 발진주파수를 3차 혼합기인 FM IF I.C(C)의 발진입력주파수로 사용하도록 구성되어있다.First, the configuration of the present invention, as shown in Figure 1 and the FM IF IC (C) to make the final intermediate frequency (IF: 450kHz ~ 455kHz) by converting the first and second frequency mixers (A, B) and the third frequency It consists of a local oscillator 10 for inputting the oscillation frequency to the 1st and 2nd mixers (A, B) and the FM IF IC (C) to make the intermediate frequency. The local oscillator 10 is a PLL (Phasor Locked Loop). VCO (Voltage Control Oscillator) (D), LPF (Low Pass Filter) (K), and PLL IC (E) to oscillate the reference signals of the crystal oscillator (F), PLL IC (E) and CPU (I). It is configured to control the VCO (D) and use the stable high frequency output from VCO (D) as the oscillation input frequency of the 1st and 2nd mixers (A, B), and the oscillation frequency of the crystal oscillator (F) as the 3rd mixer. It is configured to use as the oscillation input frequency of FM IF IC (C).
상기에서 언급된 각 구성요소들을 특정 주파수로 예를 들어 핸디(HANDY)와 베이스(BASE)에 대하여 동작순서에 따라 설명을 하면 우선 핸디에서는 2400.15MHz의 주파수가 안테나를 통하여 수신이 된 후 B.P.F(Band Pass Filter)와 증폭기를 거쳐 1차 주파수 혼합기(A)로 입력이 된다.이때, 국부발진부(10)의 V.C.O(D)는 PLL I.C(E)의 제어를 받아 796.45MHz의 주파수를 발진시키고 V.C.O(D)에서 발진된 신호는 분주기(H)와 주파수를 2배 증폭하는 주파수 체배기(G)를 거쳐 1592.90MHz의 신호가 1차 주파수 혼합기(A)의 또 다른 입력이 된다.1차 주파수 혼합기(A)에서 안테나를 통해 수신된 주파수와 체배된 V.C.O(D)발진주파수의 차(2400.15-1592.90=807.25[MHz])를 출력하게 되고, 1차 주파수 혼합기(A)의 출력신호는 2차 주파수 혼합기(B)의 입력주파수로 사용된다.또한 2차 주파수 혼합기(B)의 발진입력주파수로 V.C.O(D)의 기본주파수가 입력이 됨으로서 2차 주파수 혼합기(B)는 10.8MHz(807.25-796.45[MHz])의 신호를 출력하고, 1차와 2차 주파수 혼합기(A,B)를 통과하며 낮아진 주파수(10.8MHz)는 마지막으로 3차 주파수 혼합기인 FM IF I.C(C)의 발진입력주파수로 사용되고 FM IF I.C(C)의 입력주파수로는 국부발진부(10)의 수정발진기(F)에서 발진되는 11.25MHz의 주파수가 FM IF I.C(C)로 입력된다.이때 FM IF I.C(C)에서는 수정발진기(F)에서 발진되는 주파수와 2차 주파수 변환기(B)의 출력주파수의 차(11.25-10.8=0.45[MHz]=450kHz:중간 주파수)를 출력하게되어 증폭이 용이한 중간 주파수를 만들게 된다.이와 같은 주파수 변환 방식은 베이스의 발신주파수를 핸디의 수신주파수로 사용됨으로 베이스에서도 동일한 방식으로 주파수가 변환되는 것이다.이하 핸디와 베이스의 주파수변화표를 각각의 단계에 의한 표를 참조하면 다음과 같다.When the above-mentioned components are described in a specific frequency, for example, according to the operating sequence for the HANDY and the BASE, the handyman first receives a frequency of 2400.15 MHz through the antenna and then uses the BPF (Band). Through the pass filter) and the amplifier, it is input to the primary frequency mixer (A). At this time, the VCO (D) of the local oscillator 10 is controlled by the PLL IC (E) to oscillate a frequency of 796.45MHz and the VCO ( The signal oscillated in D) passes through a divider (H) and a frequency multiplier (G) that amplifies the frequency twice, and a signal of 1592.90 MHz is another input of the primary frequency mixer (A). A) outputs the difference (2400.15-1592.90 = 807.25 [MHz]) between the frequency received through the antenna and the multiplied VCO (D) oscillation frequency, and the output signal of the primary frequency mixer (A) is the secondary frequency mixer. It is used as the input frequency of (B). Also, the oscillation input of the secondary frequency mixer (B). As the fundamental frequency of VCO (D) is input as a wave number, the secondary frequency mixer (B) outputs a signal of 10.8 MHz (807.25-796.45 [MHz]), and the primary and secondary frequency mixers (A, B) The lowered frequency (10.8MHz) is finally used as the oscillation input frequency of the 3rd frequency mixer, FM IF IC (C), and the crystal oscillator (F) of the local oscillator 10 is used as the input frequency of the FM IF IC (C). The 11.25MHz frequency oscillated at is input to the FM IF IC (C), where the difference between the frequency oscillated at the crystal oscillator (F) and the output frequency of the secondary frequency converter (B) (11.25). -10.8 = 0.45 [MHz] = 450kHz (intermediate frequency) to produce an intermediate frequency that is easy to amplify.This frequency conversion method uses the outgoing frequency of the base as the receiver's receiving frequency, The frequency is converted. When the reference table according to the steps as follows.
따라서 본 발명은 2.4∼2.5GHz의 주파수를 수신/중간주파수로 변환이 가능하도록 하였기 때문에 주파수가 높은 무선주파수(UHF)의 복조가 어려운 단점을 해결하여 보다 넓은 대역의 주파수를 이용이 가능한 이점이 있다.Therefore, the present invention has the advantage that it is possible to convert the frequency of 2.4 ~ 2.5GHz to the reception / intermediate frequency to solve the disadvantage of difficult demodulation of the high frequency radio frequency (UHF) to use a wider frequency band .
또한 상기의 본 발명의 구성을 이용하여 2.4GHz보다 낮은 대역의 주파수처리 능력을 갖는 주파수 변환기를 제조하게 되면 V.C.O(D)와 PLL I.C(E)와 PLL I.C(E)의 참조신호로 사용되는 수정발신기(F)의 발진 주파수 및 처리 주파수 대역이 낮아지고 따라서 주파수 대역이 낮아질수록 그 부품의 단가가 절감되어 제조비용이 낮아져 보다 저렴한 가격으로 공급이 가능한 이점이 있다. In addition, if a frequency converter having a frequency processing capacity of a band lower than 2.4 GHz is manufactured using the above-described configuration, the crystal is used as a reference signal of the VCO (D), the PLL IC (E), and the PLL IC (E). As the oscillation frequency and the processing frequency band of the transmitter F are lowered, and thus the frequency band is lowered, the unit cost of the component is reduced and manufacturing cost is lowered.
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Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
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KR960027408A (en) * | 1994-12-14 | 1996-07-22 | 배순훈 | Satellite frequency converter |
KR970068174A (en) * | 1996-03-19 | 1997-10-13 | 김광호 | Frequency converter to obtain stable frequency |
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Publication number | Priority date | Publication date | Assignee | Title |
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KR960027408A (en) * | 1994-12-14 | 1996-07-22 | 배순훈 | Satellite frequency converter |
KR970068174A (en) * | 1996-03-19 | 1997-10-13 | 김광호 | Frequency converter to obtain stable frequency |
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