KR19990048041A - Modulator demodulator of personal communication terminal - Google Patents
Modulator demodulator of personal communication terminal Download PDFInfo
- Publication number
- KR19990048041A KR19990048041A KR1019970066642A KR19970066642A KR19990048041A KR 19990048041 A KR19990048041 A KR 19990048041A KR 1019970066642 A KR1019970066642 A KR 1019970066642A KR 19970066642 A KR19970066642 A KR 19970066642A KR 19990048041 A KR19990048041 A KR 19990048041A
- Authority
- KR
- South Korea
- Prior art keywords
- signal
- communication terminal
- personal communication
- data
- converter
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Ceased
Links
- 238000004891 communication Methods 0.000 title claims abstract description 32
- 238000005070 sampling Methods 0.000 claims abstract description 38
- 238000000034 method Methods 0.000 abstract description 9
- 238000006243 chemical reaction Methods 0.000 abstract description 8
- 230000005540 biological transmission Effects 0.000 abstract description 6
- 238000010586 diagram Methods 0.000 description 7
- 230000010355 oscillation Effects 0.000 description 2
- 230000010363 phase shift Effects 0.000 description 2
- 230000001934 delay Effects 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
Landscapes
- Digital Transmission Methods That Use Modulated Carrier Waves (AREA)
Abstract
본 발명은 개인용통신단말기에서의 변조 및 복조과정에서 IF를 직접 샘플링하는 다이렉트 컨버젼(direct conversion)방식으로 변조 및 복조기를 구현시킴으로써, 사용부품수가 줄어들어 가격면에서 저렴하고, 집적회로(IC)화가 유리한 개인용통신단말기의 변복조기에 관한 것이다.The present invention implements a modulation and demodulator in a direct conversion method of directly sampling IF in a modulation and demodulation process in a personal communication terminal, thereby reducing the number of parts used and inexpensive in terms of integrated circuit (IC). The present invention relates to a demodulator for a personal communication terminal.
본 발명에 의하면, 주파수컨버젼없이 중간주파신호를 직접 샘플링하는 방식에 의해서, 중간주파신호를 수신데이타로 변환시키고, 송신데이타를 중간주파신호로 변환시키도록 하는 복조기 및 변조기를 간단하게 실현시킴으로써, 저렴한 제품공급이 가능하며, 또한 간단한 장치구성으로 IC화에도 유리하게 되는 것이다.According to the present invention, a simple demodulator and a modulator for converting an intermediate frequency signal into a reception data and a transmission data into an intermediate frequency signal by simply sampling the intermediate frequency signal without frequency conversion can be realized. It is possible to supply products, and it is advantageous to IC with simple device configuration.
Description
본 발명은 개인용통신단말기의 변복조기에 관한 것으로, 특히 개인용통신단말기에서의 변조 및 복조과정에서 IF를 직접 샘플링하는 다이렉트 컨버젼(direct conversion)방식으로 변조 및 복조기를 구현시킴으로써, 사용부품수가 줄어들어 가격면에서 저렴하고, 집적회로(IC)화가 유리한 개인용통신단말기의 변복조기에 관한 것이다.The present invention relates to a demodulator of a personal communication terminal, and in particular, by implementing a modulation and demodulator in a direct conversion method of directly sampling IF in the process of modulation and demodulation in a personal communication terminal, the number of parts used is reduced in terms of price. The present invention relates to a demodulator for a personal communication terminal which is inexpensive and advantageous in integrated circuit (IC).
일반적으로, 개인용통신시스템(PCS)이라고 불리워지고 있는 개인용통신단말기는 도 1에 도신한 바와같으며, 도 1을 참조하면, 일반적인 개인용통신단말기는 안테나(ant)로부터의 수신신호를 처리하는 수신블럭과, 송신신호를 처리하는 송신블럭으로 이루어져 있다.In general, a personal communication terminal called a personal communication system (PCS) is as shown in Fig. 1, and referring to Fig. 1, a general personal communication terminal is a reception block for processing a received signal from an antenna (ant). And a transmission block for processing the transmission signal.
상기 수신블럭은 수신신호를 증폭하는 증폭기(11)와, 상기 증폭된 신호를 대역통과시키는 대역통과필터(12)와, 상기 대역통과된 신호를 발진신호와 믹싱하여 중간주파신호를 출력하는 믹서(13)와, 상기 중간주파신호를 대역통과시키는 대역통과필터(14)와, 상기 대역통과된 신호를 증폭하는 증폭기(15)와, 상기 증폭된 중간주파신호를 복조하여 수신데이타(RX-I,RX-Q)를 출력하는 복조기(16)로 이루어져 있다.The reception block includes an amplifier 11 for amplifying a received signal, a band pass filter 12 for band-passing the amplified signal, and a mixer for mixing the band-passed signal with an oscillation signal and outputting an intermediate frequency signal ( 13), a band pass filter 14 for band-passing the intermediate frequency signal, an amplifier 15 for amplifying the band-passed signal, and demodulation of the amplified intermediate frequency signal to receive data (RX-I, Demodulator 16 for outputting RX-Q).
상기 송신블럭은 송신데이타(TX-I,TX-Q)를 변조시키는 변조기(21)와, 상기 변조된 신호를 증폭하는 증폭기(22)와, 상기 증폭된 신호를 대역통과시키는 대역통과필터(23)와, 상기 대역통과된 신호를 발진신호와 믹싱하여 고주파신호를 출력하는 믹서(23)와, 상기 고주파신호를 대역통과시키는 대역통과필터(25)와, 상기 대역통과된 신호를 증폭하는 증폭기(26)와, 상기 증폭된 신호를 대역통과시키는 대역통과필터(27)와, 상기 대역통과된 신호에 대한 전력을 증폭하는 전력증폭기(28)로 이루어져 있다.The transmission block includes a modulator 21 for modulating transmission data TX-I and TX-Q, an amplifier 22 for amplifying the modulated signal, and a bandpass filter 23 for bandpassing the amplified signal. ), A mixer 23 for mixing the bandpass signal with an oscillation signal and outputting a high frequency signal, a bandpass filter 25 for bandpassing the high frequency signal, and an amplifier for amplifying the bandpass signal. 26), a band pass filter 27 for band-passing the amplified signal, and a power amplifier 28 for amplifying power for the band-passed signal.
이와같이 구성된 개인용통신단말기에 있어서, 상기 복조기(16)에 대한 종래의 구성은 도 2에 도시한 바와 같으며, 도 2를 참조하면, 종래의 복조기는 믹서, 대역통과필터, 증폭기, 샘플링부 및 A/D변환기로 구성되어 있으며, 종래의 변조기는 도 3에 도시된 바와 같으며, 종래의 변조기는 D/A변환기, 대역통과필터 및 변조용 믹서로 구성되어 있다.In the personal communication terminal configured as described above, the conventional configuration of the demodulator 16 is as shown in Figure 2, referring to Figure 2, the conventional demodulator is a mixer, a band pass filter, an amplifier, a sampling unit and A It is composed of a / D converter, a conventional modulator is shown in Figure 3, the conventional modulator is composed of a D / A converter, a bandpass filter and a mixer for modulation.
그러나, 슈퍼 헤테로다인방식을 사용하고 있는 종래 개인용통신단말기는 두 번의 컨버젼을 수행하여야 하므로, 사용 부품수가 증가하여 제품의 가격이 상승되는 문재점이 있었던 것이다.However, since the conventional personal communication terminal using the super heterodyne method has to perform two conversions, there has been a problem point that the price of the product is increased due to the increase in the number of parts used.
본 발명은 상기한 문제점을 해결하기 위해 안출한 것으로, 따라서, 본 발명의 목적은 개인용통신단말기에서의 변조 및 복조과정에서 IF를 직접 샘플링하는 다이렉트 컨버젼(direct conversion)방식으로 변조 및 복조기를 구현시킴으로써, 사용부품수가 줄어들어 가격면에서 저렴하고, 집적회로(IC)화가 유리한 개인용통신단말기의 변복조기를 제공하는데 있다.SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and therefore, an object of the present invention is to implement a modulation and demodulator by a direct conversion method of directly sampling IF during modulation and demodulation in a personal communication terminal. The present invention provides a demodulator for a personal communication terminal, which is inexpensive due to the reduced number of parts used and is advantageous in integrated circuit (IC).
도 1은 일반적인 개인통신단말기의 내부구성도이다.1 is an internal configuration diagram of a general personal communication terminal.
도 2는 종래의 개인용통신단말기의 복조기의 구성도이다.2 is a block diagram of a demodulator of a conventional personal communication terminal.
도 3은 종래의 개인용통신단말기의 변조기의 구성도이다.3 is a block diagram of a modulator of a conventional personal communication terminal.
도 4는 본 발명에 따른 개인용통신단말기의 복조기의 구성도이다.4 is a block diagram of a demodulator of a personal communication terminal according to the present invention.
도 5는 본 발명에 따른 개인용통신단말기의 변조기의 구성도이다.5 is a block diagram of a modulator of a personal communication terminal according to the present invention.
* 도면의 주요부분에 대한 부호의 설명 *Explanation of symbols on the main parts of the drawings
161 : 샘플링부 162 : 샘블링부161: sampling unit 162: sampling unit
163 : 지연부 164 : A/D변환부163: delay unit 164: A / D conversion unit
165 : A/D변환부 211 : D/A변환부165: A / D converter 211: D / A converter
212 : D/A변환부 213 : 대역통과필터212: D / A converter 213: band pass filter
214 : 대역통과필터 216 : 위상시프트부214: band pass filter 216: phase shift unit
상기한 본 발명의 목적을 달성하기 위한 기술적인 수단으로써, 본 발명의 복조기는 개인용통신단말기에서 중간주파수를 복조하는 복조기에 있어서, 상기 중간주파신호중 I신호를 소정의 샘플링주파수로 샘플링하는 I신호 샘플링부; 상기 I신호 샘플링부에서 샘플링된 I신호를 소정시간만큼 지연시키는 지연부; 상기 지연부를 통한 신호를 디지탈데이타로 변환시켜 수신I데이타를 출력하는 A/D변환부; 상기 중간주파신호중 Q신호를 소정의 샘플링주파수로 샘플링하는 Q신호 샘플링부; 상기 Q신호 샘플링부에서 샘플링된 Q신호를 디지탈데이타로 변환시켜 수신Q데이타를 출력하는 A/D변환부; 를 구비함을 특징으로 한다.As a technical means for achieving the above object of the present invention, the demodulator of the present invention in the demodulator for demodulating the intermediate frequency in the personal communication terminal, I signal sampling for sampling the I signal of the intermediate frequency signal at a predetermined sampling frequency part; A delay unit for delaying the I signal sampled by the I signal sampling unit by a predetermined time; An A / D converter for converting a signal through the delay unit into digital data and outputting received I data; A Q signal sampling unit for sampling the Q signal of the intermediate frequency signal at a predetermined sampling frequency; An A / D converter converting the Q signal sampled by the Q signal sampling unit into digital data and outputting received Q data; Characterized in having a.
또한, 본 발명의 목적을 달성하기 위한 다른 기술적인 수단으로써, 본 발명의 변조기는 송신할 데이타를 변조하는 개인용통신단말기의 변조기에 있어서, 상기 송신할 데이타중 I데이타를 아날로그신호로 변환시키는 D/A변환기; 상기 D/A변환부로부터의 아날로그신호를 대역통과시켜 중간주파신호를 출력하는 대역통과필터; 상기 송신할 데이타중 Q데이타를 아날로그신호로 변환시키는 D/A변환부; 상기 D/A변환부로부터의 아날로그신호를 대역통과시켜 중간주파신호를 출력하는 대역통과필터; 상기 대역통과필터에 의해 대역통과된 신호에 대한 위상을 90°시프트시켜 출력하는 위상시프터; 를 구비함을 특징으로 한다.In addition, as another technical means for achieving the object of the present invention, the modulator of the present invention in the modulator of the personal communication terminal for modulating the data to be transmitted, D / D to convert the I data of the data to be transmitted to an analog signal A converter; A band pass filter for band-passing the analog signal from the D / A converter and outputting an intermediate frequency signal; A D / A converter for converting Q data of the data to be transmitted into an analog signal; A band pass filter for band-passing the analog signal from the D / A converter and outputting an intermediate frequency signal; A phase shifter for shifting a phase of the signal band-passed by the bandpass filter by 90 ° and outputting the phase shifter; Characterized in having a.
이하, 본 발명에 따른 개인용통신단말기의 변복조기에 대해서 첨부한 도면을 참조하여 상세하게 설명한다.Hereinafter, a modulator of a personal communication terminal according to the present invention will be described in detail with reference to the accompanying drawings.
도 4는 본 발명에 따른 개인용통신단말기의 복조기의 구성도로서, 도 4를 참조하면, 본 발명에 따른 개인용통신단말기의 복조기는 믹서를 통해 출력되는 중간주파신호중 I신호를 소정의 샘플링주파수로 샘플링하는 I신호 샘플링부(161)와, 상기 I신호 샘플링부(161)에서 샘플링된 I신호를 소정시간만큼 지연시키는 지연부(163)와, 상기 지연부(163)를 통한 신호를 디지탈데이타로 변환시켜 수신I데이타(RX-I)를 출력하는 A/D변환부(165)와, 상기 중간주파신호중 Q신호를 소정의 샘플링주파수로 샘플링하는 Q신호 샘플링부(162)와, 상기 Q신호 샘플링부(162)에서 샘플링된 Q신호를 디지탈데이타로 변환시켜 수신Q데이타를 출력하는 A/D변환부(RX-Q)로 구성한다.4 is a configuration diagram of a demodulator of a personal communication terminal according to the present invention. Referring to FIG. 4, the demodulator of the personal communication terminal according to the present invention samples an I signal of an intermediate frequency signal output through a mixer at a predetermined sampling frequency. The I signal sampling unit 161, a delay unit 163 for delaying the I signal sampled by the I signal sampling unit 161 by a predetermined time, and converting the signal through the delay unit 163 into digital data. An A / D converter 165 for outputting received I data (RX-I), a Q signal sampling unit 162 for sampling a Q signal of the intermediate frequency signal at a predetermined sampling frequency, and the Q signal sampling unit A / D converter (RX-Q) converts the Q signal sampled at 162 into digital data and outputs received Q data.
도 5는 본 발명에 따른 개인용통신단말기의 변조기의 구성도로서, 도 5를 참조하면, 본 발명에 따른 개인용통신단말기의 변조기는 상기 송신할 데이타중 I데이타(TX-I)를 아날로그신호로 변환시키는 D/A변환기(211)와, 상기 D/A변환부(211)로부터의 아날로그신호를 대역통과시켜 중간주파신호를 출력하는 대역통과필터(213)와, 상기 송신할 데이타중 Q데이타(TX-Q)를 아날로그신호로 변환시키는 D/A변환부(212)와, 상기 D/A변환부(212)로부터의 아날로그신호를 대역통과시켜 중간주파신호를 출력하는 대역통과필터(214)와, 상기 대역통과필터(214)에 의해 대역통과된 신호에 대한 위상을 90°시프트시켜 출력하는 위상시프터(216)로 구성한다.5 is a configuration diagram of a modulator of a personal communication terminal according to the present invention. Referring to FIG. 5, the modulator of the personal communication terminal according to the present invention converts I data (TX-I) of the data to be transmitted into an analog signal. A D / A converter 211, a band pass filter 213 for band-passing an analog signal from the D / A converter 211 and outputting an intermediate frequency signal, and Q data (TX) of the data to be transmitted. A D / A converter (212) for converting -Q) into an analog signal, a band pass filter (214) for band-passing an analog signal from the D / A converter (212) and outputting an intermediate frequency signal; The phase shifter 216 shifts the phase of the signal band-passed by the band pass filter 214 by 90 degrees.
이와같이 구성된 본 발명에 따른 동작을 첨부도면에 의거하여 하기에 상세히 설명한다.Operation according to the present invention configured as described above will be described in detail below based on the accompanying drawings.
도 4와 도 5를 참조하여 본 발명에 따른 개인용통신단말기의 변복조기에 대해서 설명하면, 먼저 도 4에서 믹서로부터의 중간주파신호(IFin)는 I신호 샘플링부(161)에서 소정의 샘플링주파수에 따라 샘플링된후 지연부(163)로 출력되고, 상기 지연부(163)에서는 상기 샘플링부(161)에서 샘플링된 신호를 소정시간만큼 지연시킨후 A/D변환부(165)로 출력한다. 그리고, 상기 A/D변환부(165)는 상기 지연부(163)에서 소정시간 지연된 신호를 디지탈데이타로 변환시켜 수신I데이타(RX-I)를 출력한다.4 and 5, the demodulator of the personal communication terminal according to the present invention will be described first. In FIG. 4, the intermediate frequency signal IFin from the mixer according to the predetermined sampling frequency in the I signal sampling unit 161 is described. After sampling, the signal is output to the delay unit 163. The delay unit 163 delays the signal sampled by the sampling unit 161 by a predetermined time and then outputs the signal to the A / D converter 165. The A / D converter 165 converts the signal delayed by the delay unit 163 into digital data and outputs received I data RX-I.
또한, 도 4에서 믹서로부터의 중간주파신호(IFin)는 Q신호 샘플링부(162)에서 소정의 샘플링주파수에 따라 샘플링된후 A/D변환부(164)에서 디지탈데이타로 변환되어 수신Q데이타(RX-Q)를 출력한다.In addition, in FIG. 4, the intermediate frequency signal IFin from the mixer is sampled by the Q signal sampling unit 162 according to a predetermined sampling frequency, and then converted into digital data by the A / D converter 164 to receive received Q data ( RX-Q) is output.
다음, 도 5를 참조하여 본 발명에 따른 개인용통신단말기의 변조기에 대해서 설명하면, 송신할 데이타중 I데이타(TX-I)는 D/A변환부(211)에서 아날로그신호로 변환된후 대역통과필터(213)를 통해서 중간주파신호로 출력되고, 또한 상기 송신할 데이타중 Q데이타(TX-Q)는 D/A변환부(212)에서 아날로그신호로 변환된 대역통과필터(214)를 통해서 중간주파신호가 출력되는데, 이 중간주파신호는 위상시프트(216)에서 90°만큼 위상이 시프트된 다음 출력된다.Next, the modulator of the personal communication terminal according to the present invention will be described with reference to FIG. 5. After the I-data TX-I of the data to be transmitted is converted into an analog signal by the D / A converter 211, the bandpass is passed. The Q data TX-Q, which is output as an intermediate frequency signal through the filter 213, and is transmitted through the band pass filter 214 converted by the D / A converter 212 into an analog signal. A frequency signal is output, which is output after being shifted in phase by 90 ° in the phase shift 216.
상기한 본 발명에 의하면, 주파수컨버젼없이 중간주파신호를 직접 샘플링하는 방식에 의해서, 중간주파신호를 수신데이타로 변환시키고, 송신데이타를 중간주파신호로 변환시키도록 하는 복조기 및 변조기를 간단하게 실현시킴으로써, 저렴한 제품공급이 가능하며, 또한 간단한 장치구성으로 IC화에도 유리하게 되는 것이다.According to the present invention, a demodulator and a modulator for converting an intermediate frequency signal into reception data and converting transmission data into an intermediate frequency signal by simply realizing a method of directly sampling an intermediate frequency signal without frequency conversion are realized. Inexpensive product supply is possible, and simple device configuration is advantageous for IC.
상술한 바와같은 본 발명에 따르면, 개인용통신단말기에서의 변조 및 복조과정에서 IF를 직접 샘플링하는 다이렉트 컨버젼(direct conversion)방식으로 변조 및 복조기를 구현시킴으로써, 사용부품수가 줄어들어 가격면에서 저렴하고, 집적회로(IC)화가 유리하게 되는 효과가 있는 것이다.According to the present invention as described above, by implementing a modulation and demodulator in a direct conversion method of directly sampling IF in the modulation and demodulation process in a personal communication terminal, the number of parts used is inexpensive and inexpensive and integrated There is an effect that the circuit (IC) is advantageous.
이상의 설명은 본 발명의 일실시예에 대한 설명에 불과하며, 본 발명은 그 구성의 범위내에서 다양한 변경 및 개조가 가능한다.The above description is only a description of one embodiment of the present invention, the present invention is capable of various changes and modifications within the scope of the configuration.
Claims (2)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1019970066642A KR19990048041A (en) | 1997-12-08 | 1997-12-08 | Modulator demodulator of personal communication terminal |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1019970066642A KR19990048041A (en) | 1997-12-08 | 1997-12-08 | Modulator demodulator of personal communication terminal |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| KR19990048041A true KR19990048041A (en) | 1999-07-05 |
Family
ID=66089008
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| KR1019970066642A Ceased KR19990048041A (en) | 1997-12-08 | 1997-12-08 | Modulator demodulator of personal communication terminal |
Country Status (1)
| Country | Link |
|---|---|
| KR (1) | KR19990048041A (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0614070A (en) * | 1992-06-26 | 1994-01-21 | Sanyo Electric Co Ltd | Digital demodulator |
| JPH06141017A (en) * | 1992-10-26 | 1994-05-20 | Sharp Corp | Spread spectrum communication system |
| JPH06205064A (en) * | 1993-01-05 | 1994-07-22 | Sony Corp | Orthogonal detector |
| JPH07231338A (en) * | 1994-02-21 | 1995-08-29 | Matsushita Electric Ind Co Ltd | Direct conversion receiver |
| JPH10164164A (en) * | 1996-11-25 | 1998-06-19 | Matsushita Electric Ind Co Ltd | Digital demodulator |
| KR19990019196A (en) * | 1997-08-29 | 1999-03-15 | 전주범 | Direct intermediate frequency signal sampling method of digital demodulation system |
-
1997
- 1997-12-08 KR KR1019970066642A patent/KR19990048041A/en not_active Ceased
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0614070A (en) * | 1992-06-26 | 1994-01-21 | Sanyo Electric Co Ltd | Digital demodulator |
| JPH06141017A (en) * | 1992-10-26 | 1994-05-20 | Sharp Corp | Spread spectrum communication system |
| JPH06205064A (en) * | 1993-01-05 | 1994-07-22 | Sony Corp | Orthogonal detector |
| JPH07231338A (en) * | 1994-02-21 | 1995-08-29 | Matsushita Electric Ind Co Ltd | Direct conversion receiver |
| JPH10164164A (en) * | 1996-11-25 | 1998-06-19 | Matsushita Electric Ind Co Ltd | Digital demodulator |
| KR19990019196A (en) * | 1997-08-29 | 1999-03-15 | 전주범 | Direct intermediate frequency signal sampling method of digital demodulation system |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US4855894A (en) | Frequency converting apparatus | |
| EP0909067A1 (en) | Modulator and modulation method | |
| KR880013312A (en) | Baseband Phase Modulator Device Using Digital Technology | |
| CA2242294A1 (en) | Bandpass phase tracker with hilbert transformation before plural-phase analog-to-digital conversion | |
| JPH09219664A (en) | Radio transmitter-receiver | |
| KR20050062635A (en) | Single oscillator dsss and ofdm radio receiver and transmitter | |
| KR980007140A (en) | Transmitter / receiver of time division full duplex spread spectrum communication system | |
| US5652552A (en) | Phase modulator | |
| US7054382B2 (en) | Modulator of phase shift keying (PSK) type | |
| KR19990048041A (en) | Modulator demodulator of personal communication terminal | |
| US7280003B2 (en) | Modulation device and transmitter comprising such a device | |
| KR100241890B1 (en) | Circuit for removing interference in digital communication system | |
| JPH06205064A (en) | Orthogonal detector | |
| JPH0774790A (en) | Non-linear distortion compensation transceiver circuit | |
| US5049839A (en) | Biphase modulaton circuit having continuous phase changes | |
| JP2915875B2 (en) | Asynchronous receiver for FH | |
| JPH03258125A (en) | Radio communication equipment | |
| JPH08186447A (en) | Phase detection circuit for radar receiver | |
| KR920000167B1 (en) | Dual phase modulation circuit with equivalent envelope | |
| JPH04290337A (en) | Orthogonal modulator | |
| KR100186600B1 (en) | Noise Canceling Device and Method of Modulator | |
| JP2001228242A (en) | Digital phase-detecting apparatus and pulse radar apparatus | |
| JPH1032519A (en) | Radio communication equipment | |
| JP3960692B2 (en) | Digital quadrature modulator | |
| KR200211725Y1 (en) | Frequency Conversion Circuit |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PA0109 | Patent application |
Patent event code: PA01091R01D Comment text: Patent Application Patent event date: 19971208 |
|
| PG1501 | Laying open of application | ||
| A201 | Request for examination | ||
| PA0201 | Request for examination |
Patent event code: PA02012R01D Patent event date: 19991115 Comment text: Request for Examination of Application Patent event code: PA02011R01I Patent event date: 19971208 Comment text: Patent Application |
|
| E902 | Notification of reason for refusal | ||
| PE0902 | Notice of grounds for rejection |
Comment text: Notification of reason for refusal Patent event date: 20010828 Patent event code: PE09021S01D |
|
| E601 | Decision to refuse application | ||
| PE0601 | Decision on rejection of patent |
Patent event date: 20011211 Comment text: Decision to Refuse Application Patent event code: PE06012S01D Patent event date: 20010828 Comment text: Notification of reason for refusal Patent event code: PE06011S01I |