經濟部中夬標率局員工消f合作社印裝 4iU63 A7 _B7___ 五、發明説明（） ， 本發明為一種無線電收發系統，尤指一種雙轉換式 無線電收發系統。 目如在數位無線電話（digital Cordless telephone) 的無線電收發系統中，雙轉換式（dual conversion)系統 通常需要用到兩組本地振盪器來調變與解調訊號。圖1為 一傳統雙轉換式無線電收發系統10的系統方塊圖。系統 10包含有天線1 〇 1用來接收與發射無線電訊號、一雙向 傳輸裝置102(duplexer)内含有一接收迴路與一發射迴 路（未顯示）’該接收迴路是用來整合天線阻抗與射頻放大 器111間的輸入阻.抗以提高接收效率並選擇所欲接收的 頻率以及濾除雜訊與干擾訊號。天線101所收到的射頻訊 號會經由雙向傳輸裝置1〇2進入射頻放大器Hi進行玫 大’經過放大後的訊號經由前級濾波器Η 2的濾波後會經 由波益113與第一本地振盈器140所產生的第一本地振 靈訊號:¾波而得到一中頻訊說。中頻濾波器Η 4會將中頻 訊號中不需要用到的頻率濾掉，過濾後的訊號再經由解調 器1.20 ’依據本地振盈器150所產生的第二本地振盪訊 號’解調而產生基頻訊號以供一後級電路（未顯.示）處理。 乐統10另包含有一調變器i 6 Q闬來依據本地振簠器 15 0所產生的第二本地振盪訊號，將一後級電路所欲傳送 的基頻訊號調變至發射中頻訊號、一中頻濾波器170用來 濾除發射中頻訊號不需要用到的頻率、一混波器用來 依據第一本地振盪器140所產生的第一本地振盪訊號，將 中頻滅波器丨7 0 ί慮波後所產生的訊號升頻成發射訊號。減 I I— n i m n ---1 i n I--! - - - (請先閲讀背面之注意事項再填寫本頁) Ί 法尺度逋用中國國家標準（CNS > Α4规格（210X297公釐） 4^7363 經濟部中夬j隼局員工消费合作社印製 A7 B7 _ 五、發明説明（） 波器172會將發射訊號内不需要用到的頻率濾除，再經由 功率放大器173將其放大並利用雙向傳輸裝置1〇2内的發 射迴路將功率放大器173所產生不需要的頻率濾除並匹 配至天線1〇1 ’最後從天線發射出去。 系統10的解調器120為一常用的四相解調器 (quadrature demodulator) ’ 而調變器 160 則為一常用 的ί/Q調變器。調變器160包含有一 90度相位偏移器163 用來將第二本地振盪訊號的相位偏移度，一 I混波器 161用來將I基頻訊號191與相位偏移器163輸出之訊號 混波，一 Q混波器162用來將Q基頻訊號192與第冬本地 *振盪訊號混波’以及一加法器164用來將I混波器16 i與 Q混波器162之輸出訊號相加，並產生發射中頻訊號。系統10之本地振盪器有二。第一本地振盪器14〇， 由一壓控振盪器（VCO-voltage controlled oscillat-〇r)141 以及一鎖相迴路（PLL-phase locked loop)142 所 構成之迴路所組成。鎖相迴路142是用來穩定頻率並根據 信號線144的輸出來產生發射或接收所需要的第一本地 振盪訊號頻率。第二本地振盪器150是由壓控振盪器151 以及一鎖相迴路152所構成之迴路所組成。鎖相迴路152 是用來穩定頻率並根據信號線154的輸出來產生發射或 接收所需要的第二本地振盪訊號頻率。 以上二本地振盪器均以一石英振盪迴路155所產生 的$頻率訊號做為其參考訊號。鎖相迴路142的信號線 144和鎖相迴路152的信號線154係同步動作用來控制訊 Ε - - - 1 -In- i I I - n ---—1 1 - - I …- (請先閲讀背面之注意Ϋ項再填寫本頁) 本紙張尺度適用中國國家標牵·（ CNS ) A4規格U10XM7公釐） 經濟部中央標率局員工消費合作.社印製 417263 A7 ____ B7 五、發明説明（） 號的發射與接收，這兩條信號線都是電連於一由微處理機 所組成的控制單元（未顯示）用來控制。 除此之外，系統10另包含有一功率放大器控制迴路 180，其包含有一信號線193用來在控制單元的控制下於 發射時將功率放大器Π3打開。 請參考圖2。圖2為另一傳統雙轉換式無線電收發 糸統^0的系統方塊圖。系統2〇包含有一天線2〇1用來接 收與發射無線電訊號'一前級電路202是用來整合天線阻 抗與射頻放大器2丨1間的輸入阻抗以提高接收效率並選 擇所欲接收的頻,率以及濾除雜訊與干擾訊號。天線2〇1所 收到的射頻訊號會經由切換開關203、前級電路202進入 射頻放大器2Π進行放大，放大後的訊號會經由前級濾波 器212濾波，並經由混波器213與第一本地振盪器240所 產生的第一本地振盪訊號混波而得到一中頻訊號。中頻濾 波器214會將中頻訊號中不需要用到的頻率濾掉，過濾後 得的訊號再經由解調器220依據本地振盪器250所產生的 第二本地振盡訊號解調吞產差基頻訊號以供一後級電路 (未顯示）處理。 系誕20另包含有一調變器26办是用來依據本地振盪 器250所產生的第二本地振盪訊號，將後級電路所欲傳送 的基頻訊號調變成一發射中頻訊號，以及一變頻器270用 來將發射中頻訊號變頻成發射訊號。變頻器270輸出的發 射訊號由一功率放大迴路283將其放大後經切換開關 203，最後再從天線201發射出去。Employees of the Bureau of Standards and Technology of the Ministry of Economic Affairs printed 4iU63 A7 _B7___. 5. Description of the invention () The present invention is a radio transceiver system, especially a double conversion radio transceiver system. For example, in a digital radiotelephone (digital cordless telephone) radio transceiver system, a dual conversion system usually requires two sets of local oscillators to modulate and demodulate signals. FIG. 1 is a system block diagram of a conventional double conversion radio transceiver system 10. As shown in FIG. The system 10 includes an antenna 101 for receiving and transmitting radio signals, and a bidirectional transmission device 102 (duplexer) includes a receiving circuit and a transmitting circuit (not shown). The receiving circuit is used to integrate the antenna impedance and the RF amplifier. Input impedance between 111 to improve receiving efficiency and select the desired frequency and filter out noise and interference signals. The radio frequency signal received by the antenna 101 will enter the radio frequency amplifier Hi via the two-way transmission device 102, and the amplified signal will be filtered by the pre-filter Η 2 and passed through the wave 113 and the first local vibration gain. The first local vibration signal generated by the generator 140: ¾ wave and got an IF signal. The IF filter Η 4 filters out the frequencies that are not needed in the IF signal. The filtered signal is then demodulated by the demodulator 1.20 'based on the second local oscillation signal generated by the local oscillator 150'. Generate a baseband signal for processing by a subsequent circuit (not shown). Letong 10 also includes a modulator i 6 Q 闬 to modulate the baseband signal to be transmitted by a post-stage circuit to transmit the intermediate frequency signal according to the second local oscillation signal generated by the local oscillator 150. An IF filter 170 is used to filter out the frequencies that are not needed for transmitting the IF signal. A mixer is used to reduce the IF wave suppressor according to the first local oscillation signal generated by the first local oscillator 140. 7 0 The signal generated after the wave is up-converted into a transmitted signal. Minus II— nimn --- 1 in I--!---(Please read the precautions on the back before filling out this page) Ί Legal standards: Chinese National Standards (CNS > Α4 size (210X297 mm) 4 ^ 7363 Printed by the Consumers ’Cooperative of the Ministry of Economic Affairs of the People ’s Republic of China A7 B7 _ V. Description of the invention () The wave filter 172 filters out the frequencies that are not needed in the transmitted signal, and then amplifies it through the power amplifier 173 and uses two-way signals The transmitting circuit in the transmission device 102 filters out unwanted frequencies generated by the power amplifier 173 and matches them to the antenna 101 ′ and finally transmits it from the antenna. The demodulator 120 of the system 10 is a commonly used four-phase demodulation. The modulator 160 is a common Q / Q modulator. The modulator 160 includes a 90-degree phase shifter 163 for shifting the phase of the second local oscillation signal. An I-mixer 161 is used to mix the I-baseband signal 191 and the signal output from the phase shifter 163, and a Q-mixer 162 is used to mix the Q-baseband signal 192 with the first winter local * oscillation signal ' And an adder 164 for outputting the I mixer 16 i and the Q mixer 162 The signals are summed up to generate the IF signal for transmission. There are two local oscillators in system 10. The first local oscillator 14 is a VCO-voltage controlled oscillat-〇r 141 and a phase-locked loop. (PLL-phase locked loop) 142. The phase-locked loop 142 is used to stabilize the frequency and generate the first local oscillation signal frequency required for transmission or reception according to the output of the signal line 144. The second local oscillation The generator 150 is composed of a voltage-controlled oscillator 151 and a phase-locked loop 152. The phase-locked loop 152 is used to stabilize the frequency and generate the second local oscillation required for transmission or reception according to the output of the signal line 154 Signal frequency. The above two local oscillators use the $ frequency signal generated by a quartz oscillation circuit 155 as their reference signal. The signal line 144 of the phase-locked loop 142 and the signal line 154 of the phase-locked loop 152 are used for synchronous control. News E---1 -In- i II-n ---— 1 1--I…-(Please read the note on the back before filling out this page) This paper size applies to China National Standards · (CNS) A4 specification U10XM7 male PCT) Consumer cooperation of the Central Standards Bureau of the Ministry of Economic Affairs. The company printed 417263 A7 ____ B7 V. The transmission and reception of the invention description () number, these two signal lines are electrically connected to a control composed of a microprocessor Units (not shown) are used for control. In addition, the system 10 includes a power amplifier control circuit 180, which includes a signal line 193 for turning on the power amplifier Π3 during transmission under the control of the control unit. Please refer to Figure 2. FIG. 2 is a system block diagram of another conventional double conversion radio transceiver system. The system 20 includes an antenna 201 for receiving and transmitting radio signals. A pre-stage circuit 202 is used to integrate the antenna impedance and the input impedance between the RF amplifier 2 and 1 to improve the reception efficiency and select the desired frequency. Rate and filter out noise and interference signals. The radio frequency signal received by the antenna 201 will be amplified by the switch 203 and the pre-stage circuit 202 into the radio frequency amplifier 2Π, and the amplified signal will be filtered by the pre-stage filter 212, and passed through the mixer 213 and first The first local oscillation signal generated by the oscillator 240 is mixed to obtain an intermediate frequency signal. The IF filter 214 filters out the frequencies that are not needed in the IF signal. The filtered signal is then demodulated by the demodulator 220 according to the second local exhaustion signal generated by the local oscillator 250. The baseband signal is processed by a post-stage circuit (not shown). System 20 also includes a modulator 26, which is used to tune the baseband signal to be transmitted by the subsequent circuit into a transmitting intermediate frequency signal and a frequency conversion according to the second local oscillation signal generated by the local oscillator 250. The converter 270 is used for converting the transmission intermediate frequency signal into a transmission signal. The transmission signal output from the inverter 270 is amplified by a power amplifying circuit 283, passed through the switch 203, and finally transmitted from the antenna 201.
4 $紙张遴用中國國家橾準（CNS ) Α4规格（2丨Gx297公瘦I I-------- ---i---訂 {請先閲讀^g之注意事項再填寫太頁) _ 63 63 五 Α7 Β7 發明説明（） 系統20的解調器220為一般常用的四相解調器》調 變器260與圖1所述I/Q調變器相同。系統2〇之本地振 盪器有二。第一本地振盪器240以及第二本地振盪器 250，其内所含元件與圖Γ習知技術所述相同，於此不多 赘述。以上二本地振盪器中均以一穩定訊號產生器255做 為參考訊號’並且鎖相迴路242的信號線244和鎖相迴路 252的信號線254係同步動作用來控制訊號的發射與接 收’這兩條信號線都是電連於一由微處理機所組成的控制 單元（未顯示）用來控制系統20的操作》 除此之外’系統2 0另包含一功率放大器控制迴路 280 ’其包含有一信號線293，在控制單元的控制下於發 射時將功率放大器283打開，以及一切換開關203，其内 包含有一信號線235 ’在控制單元的控制下於接收時快速 地將天線切換至射頻放大器2丨1，而於發射時快速地將天 線切換至功率放大器283。 系統2 0與系統10最大不同處是在於系統2 〇使用了 主動閉迴路式變頻器270。變頻器270(其結構類似—頻 率成器）包含有一混波器272用來將變頻器270之輸出 訊號〔也就是發射訊號）與第一本地振盪信號相混波、一相 位偵測器2 7 4用來比較混波器2 7 2混波後之訊號與發射_ 頻訊號之相位、一低通率波器2 7 6用來濾除相位情測器 274輸出訊號中不需要的頻率、以及一壓控振盈器278用 來依據低通率波器276之輸出產生發射訊號。變頻器270 為一閉迴路，有類似混波及濾波之功能。將系統2 〇與系 5 (婧先M讀背面之注意事項再填寫本頁) 訂 經濟部中央橾準局員工消費合作社印装 本紙張尺度適用中國國家標準（CNS Μ4規格（210 X 297公釐） B7 ____ B7 ____ 經濟部中央標準局員工消費合作杜印掣 五、發明説明（） 統10相比較，使用變頻器270可省去圖1所示之較昂貴 的高頻濾波器102以及Π2，以節省成本。 綜觀上述，習知之雙轉換式無線電收發系統不論使 用傳統濾波器、混頻器或是閉迴路變頻器，均需要使用兩 個因而會增加硬體的製作成本以 及複雜性。 因此，本發明的主要目的在於提供一種只需使用一 個本地振盪器的雙轉換式無線電收發系統，用來減低硬體 的製作成本以及複雜性。 圖式之簡單說明 圖I為一傳統雙轉換式無線電收發系統的系統方塊圖。 圖2為另一傳統雙轉換式無線電收發系統的系統方塊 圖。 圖3為本發明雙轉換式無線電收發系統的系統方塊圖。 請參考圖3。圖3為本發明雙轉換式無線電收發系 統30的系統方塊圖。系統3〇包含有一天線301用來接收 與發射無線電訊號’一前級電路302用來整合天線阻抗與 ‘前級放大器311的輸入阻抗以提高接收效率並選擇.所欲 接收的頻率以及濾除雜訊與干擾訊號，開關3〇3是用來根 據信號線335的輪出來切換訊號發射與接收的途徑。前級 放大器311是用來放大天線3〇1所接收的訊號。第一濾波 态312疋用來濾除假像頻率（丨mage f requency)與雜訊。 6 ^紙浪尺度適诩中困H樣率（CNS ) A4規格（2丨0X297^^ ) ^^1. -- - — — 11 1 - - -- H 私 11 - ^^1 - m，一^J (請先閱1*背面之注意事項再填寫本頁) 4i7263 A7 B7 經.濟部中央標準局貝工消费合作社印取 五、發明説明（） ， 第一混波器313是用來將前級濾波器312處理過的訊號與 變頻器370所傳來的第一本地振盪訊號混波而得到第一 中頻訊號’而第一中頻;:慮％器314則是用來將第一中頻訊 號中不需要用到的頻率及雜_慮掉。過濾後的第一中頻訊 號再經由解調器320依據本地振盪器340所產生的第二本 地扳.摩訊號，降頻显解調而產生基頻訊號以4 一後級電路 (未顯示）處理》 系統30另包含有一調變器360用來依據本地振£器 340所產生的第二本地振盪訊號，將後級ΐ路所欲傳送的 基頻訊號調變成第二伞頻訊號、一變頻器370用來將第二 中頻訊號昇頻鱼發射訊號。變頻器370輸出的發射訊號由 功率放大器380將其放大，經開關303最後從天線301發 射出去。系統30另包含有一由微處理機所組成的控制單 元（未顯示）用來控制系統30的操作。 本地振盪器340是由一個頻率合成器342以及一石 英振盪迴路355所構成。石英振盪迴路355所產生的定頻 訊號是被用來做為頻率合成器342的參考訊號。頻率合成 器342包含有一壓控晶禮振逯器（VCXO-voltage control crystal oscillator)341 以及一鎖相迴路（PLL-phase locked loop) 344。鎖相迴路344是用來穩定頻率並且在 控制單元經由信號線346的控制下，根據信號線346的輪 出來產生發射或接收所需要的第二本地振盪訊號的頻 率。 調變器360為一般常用的I/Q調變器，其包含有一 7 本紙张尺度速用中國國家標準（CNS ) A4规格（210X297公釐） (請先聞讀背面之注意事項再填寫本買)4 $ paper selection using China National Standards (CNS) Α4 specifications (2 丨 Gx297 male thin I I -------- --- i --- order {Please read the precautions for ^ g before filling (Taiwan page) _ 63 63 Five A7 B7 Description of the invention () The demodulator 220 of the system 20 is a commonly used four-phase demodulator. The modulator 260 is the same as the I / Q modulator described in FIG. 1. There are two local oscillators in System 20. The components of the first local oscillator 240 and the second local oscillator 250 are the same as those described in the conventional technique of FIG. 1, and will not be repeated here. In the above two local oscillators, a stable signal generator 255 is used as the reference signal, and the signal line 244 of the phase-locked loop 242 and the signal line 254 of the phase-locked loop 252 are synchronized to control the transmission and reception of signals. The two signal lines are electrically connected to a control unit (not shown) composed of a microprocessor to control the operation of the system 20. In addition, 'System 2 0 includes a power amplifier control loop 280' which contains There is a signal line 293, which turns on the power amplifier 283 during transmission under the control of the control unit, and a switch 203, which contains a signal line 235 'to quickly switch the antenna to the radio frequency during reception under the control of the control unit Amplifier 21, and quickly switch the antenna to the power amplifier 283 during transmission. The biggest difference between System 2 0 and System 10 is that System 2 0 uses an active closed-loop inverter 270. Inverter 270 (the structure is similar—frequency generator) includes a mixer 272 for mixing the output signal (ie, the transmission signal) of inverter 270 with the first local oscillation signal, and a phase detector 2 7 4 is used to compare the phase of the mixer 2 7 2 after mixing with the transmitted signal, a low-pass wave filter 2 7 6 is used to filter out unwanted frequencies in the output signal of the phase detector 274, and A voltage-controlled oscillator 278 is used to generate a transmission signal based on the output of the low-pass wave filter 276. Inverter 270 is a closed loop and has functions similar to mixing and filtering. Copy System 2 0 and Department 5 (Jing M first read the notes on the back and then fill out this page) Order the printed paper of the Consumer Cooperatives of the Central Economic and Technical Bureau of the Ministry of Economic Affairs. The paper size is applicable to Chinese national standards (CNS M4 specification (210 X 297 mm) ) B7 ____ B7 ____ Employee cooperation of the Central Bureau of Standards of the Ministry of Economic Affairs Du Yinpu V. Description of the Invention Compared with the system 10, the use of the inverter 270 can eliminate the more expensive high-frequency filters 102 and Π2 shown in Figure 1, In view of the above, the conventional double-conversion radio transceiver system, whether using a traditional filter, a mixer, or a closed-loop frequency converter, requires the use of two, which increases the production cost and complexity of the hardware. Therefore, The main purpose of the present invention is to provide a double conversion type radio transmitting and receiving system which only needs to use a local oscillator, so as to reduce the production cost and complexity of the hardware. System block diagram of the system. Figure 2 is a system block diagram of another conventional double-conversion radio transceiver system. Figure 3 is a double-conversion radio of the present invention. System block diagram of the transceiver system. Please refer to FIG. 3. FIG. 3 is a system block diagram of the double conversion radio transceiver system 30 of the present invention. The system 30 includes an antenna 301 for receiving and transmitting radio signals. To integrate the antenna impedance and the input impedance of the pre-amplifier 311 to improve the reception efficiency and select the desired frequency and filter out noise and interference signals. The switch 3 is used to switch the signal according to the rotation of the signal line 335. Transmission and reception channels. The pre-amplifier 311 is used to amplify the signal received by the antenna 301. The first filter state 312 疋 is used to filter out mage f requency and noise. 6 ^ 纸 浪The scale is appropriate. The sample rate of H (CNS) A4 (2 丨 0X297 ^^) ^^ 1.----11 1---H Private 11-^^ 1-m, a ^ J (please Please read the notes on the back of 1 * before filling out this page) 4i7263 A7 B7 Printed by the Central Bureau of Standards of the Ministry of Economic Affairs of the Bayer Consumer Cooperative, V. Description of the invention (), the first mixer 313 is used to filter the pre-stage filter The 312 processed signal is mixed with the first local oscillation signal from the inverter 370 Get the first IF signal 'and the first IF;:% filter 314 is used to filter out the unnecessary frequencies and noise in the first IF signal. The filtered first IF signal is then filtered. The baseband signal generated by the demodulator 320 according to the second local trigger signal generated by the local oscillator 340, the frequency reduction demodulation is processed by a post-stage circuit (not shown). The system 30 also includes a modulation The converter 360 is used to adjust the baseband signal to be transmitted by the subsequent stage to the second umbrella frequency signal according to the second local oscillation signal generated by the local oscillator 340. An inverter 370 is used to convert the second intermediate frequency Signal up-conversion fish launch signal. The transmission signal output from the inverter 370 is amplified by the power amplifier 380, and finally transmitted from the antenna 301 via the switch 303. The system 30 further includes a control unit (not shown) composed of a microprocessor for controlling the operation of the system 30. The local oscillator 340 is composed of a frequency synthesizer 342 and a quartz oscillator circuit 355. The fixed frequency signal generated by the quartz oscillation circuit 355 is used as a reference signal for the frequency synthesizer 342. The frequency synthesizer 342 includes a VCXO-voltage control crystal oscillator 341 and a PLL-phase locked loop 344. The phase-locked loop 344 is used to stabilize the frequency and under the control of the control unit via the signal line 346, to generate the frequency of the second local oscillation signal required for transmission or reception according to the rotation of the signal line 346. Modulator 360 is a commonly used I / Q modulator, which contains a 7-sheet paper Quick Speed China National Standard (CNS) A4 specification (210X297 mm) (Please read the precautions on the back before filling in this purchase )
IT 五、發明説明（） 90度相位偏移器363用來將第二本地振盪訊號的相位偏 移90度、I混波器361是用來將由TXI埠傳入的基頻訊 號與相位偏移器363輸出之訊號相混波、Q混波器362用 來將由TXQ埠傳入的基頻訊號與第二本地振盪訊號相混 波、以及一加法器364用來將I混波器361與Q混波器362 輸出之訊號相加以產生第二中頻訊號。I/Q調變器的調 變方法為： A(t)*cos(wt+f(t))= A(t)^[cos(wt)c〇s(f(t))- sin(wt)sin(f (t))] (式 1) 其中 TXI=cos(f(t))’ TXQ=sin(f(t))，A(t)為振幅訊 號，w為第二本地振盪訊號的角頻率。 變頻器370包含有一由鎖相迴路391及壓控振盪器 375所形成的一閉迴路。鎖相迴路391包含有一分數除法 益371用來將壓控振盪器375的4出訊號（也就是發射訊 號）除頻、一相位偵測器373用來比較分數除法器371輸 出訊號與變頻器370輸入訊號（也就是第二中頻訊號）的 相位、以及一低通濾波器374用來濾除相位偵測器373輸 出訊號中不需要的頻率。壓控振盪器375是用來依據低通 經濟部中央標準局員工消費合作杜印装 率波器3.74輪出訊號的電壓來產生不同頻率之發射訊 號。 分數除法器37丨内包含有一倍數暫存器以及一分數 暫存器（圖中未標示）分別用來儲存一正整數N和一分數 F，而該二暫存器皆由控制單元經由信號線392來設定其 8 本紙張尺度逍用中國國家標準（CNS ) A4見格（21〇_>「297公釐> 經濟部中央標準局員工消費合作社印製 Α7 Β7 五、發明説明（） 值°若倍數暫存器被控制單元設定為N，而分數暫存器被 設定為F ’則第二中頻信號經過變頻器37〇後，其頻率將 被乘以Nx F倍而昇頻成為發射訊號。 本地振盈器340内的鎖相迴路344，在控制單元經 由信號線346的控制下，在發射及接收訊號時會產生不同 頻率的第二本地振盪訊號。在接收訊號時，控制單元會將 調變器360的TXI埠的輸入設定為一定值，並將txq埠的 輸入設定為零’以使調變器36〇所產生的第二中頻訊號成 為一固定頻率的訊號（請參考式丨），然後將該定頻之第二 中頻訊號送至變頻器370昇頻以做為f收訊號時的第一 本地振盪訊號》 系統30另包含有一功率放大器控制迴路· 382，其包 含有一信號線384，在控制單元的控制下於發射訊號時將IT V. Description of the Invention (90) Phase shifter 363 is used to shift the phase of the second local oscillation signal by 90 degrees, and I mixer 361 is used to shift the fundamental frequency signal and phase shifted from the TXI port. The signals output by the mixer 363 are mixed, the Q mixer 362 is used to mix the fundamental frequency signal transmitted from the TXQ port with the second local oscillation signal, and an adder 364 is used to mix the I mixer 361 and Q The signals output by the mixer 362 are added to generate a second intermediate frequency signal. The modulation method of the I / Q modulator is: A (t) * cos (wt + f (t)) = A (t) ^ [cos (wt) c〇s (f (t))-sin (wt ) sin (f (t))] (Eq. 1) where TXI = cos (f (t)) 'TXQ = sin (f (t)), A (t) is the amplitude signal, and w is the second local oscillation signal. Angular frequency. The frequency converter 370 includes a closed loop formed by a phase locked loop 391 and a voltage controlled oscillator 375. The phase-locked loop 391 includes a fractional division benefit 371 to divide the 4 output signals (ie, transmission signals) of the voltage controlled oscillator 375, and a phase detector 373 to compare the output signal of the fractional divider 371 with the inverter 370 The phase of the input signal (ie, the second intermediate frequency signal) and a low-pass filter 374 are used to filter out unwanted frequencies in the output signal of the phase detector 373. The voltage-controlled oscillator 375 is used to generate transmission signals of different frequencies based on the voltage of the 3.74 round wave output signal of the rate cooperation wave of the consumer cooperation of the Central Standards Bureau of the Ministry of Economic Affairs. The fraction divider 37 丨 includes a multiple register and a fraction register (not shown in the figure) for storing a positive integer N and a fraction F, respectively, and the two registers are controlled by the control unit through the signal line. 392 to set its 8 paper standards and use the Chinese National Standard (CNS) A4. (21〇_ > "297mm > Printed by the Consumers' Cooperatives of the Central Standards Bureau of the Ministry of Economic Affairs. A7 B7. V. Value of invention () ° If the multiple register is set to N by the control unit and the fractional register is set to F ', after the second intermediate frequency signal passes the inverter 37, its frequency will be multiplied by Nx F times and will be up-converted into a transmission Signal. The phase-locked loop 344 in the local oscillator 340, under the control of the control unit via the signal line 346, will generate a second local oscillation signal of a different frequency when transmitting and receiving signals. When receiving the signal, the control unit will Set the input of the TXI port of the modulator 360 to a certain value, and set the input of the txq port to zero 'so that the second intermediate frequency signal generated by the modulator 360 becomes a fixed frequency signal (please refer to the formula丨), and then set the frequency The second intermediate frequency signal is sent to the inverter 370 for upscaling as the first local oscillation signal when the f signal is received. The system 30 also includes a power amplifier control loop · 382, which includes a signal line 384, which is controlled by the control unit. When transmitting the signal
功率放大器380打開，'而於接收訊號時將功率放大器38Q 關閉。切換開關3 0 3亦包含有一信號線3 3 5，在控制單元 的控制下於接收訊號時快速地將天線切換至前級放大器 311 ’而於發射訊號時快速地將天線切換至功率放大器 380 » 的 本發明使用主動式變頻器37〇用來將第二中頻訊號 升頻至發射訊號’故可將圖1中昂責的雙向傳輸裝置）〇2 及高頻用濾波器172省去不用《並且’系統3〇收發頻率的 切換與頻道選擇是由本地振盪器340 '調變器360與變頻器 370在控制單元的控制下完成，和傳統的雙轉換^無線電 收發系統10以及系統2 0相比較’它可以用最少的元件來達 9 本紙張尺度通用中®國家橾隼（CNS ) Μ規格（210X2W公釐） ----------¾.-- 訂 • —11— ί /U7：ie A7 B7 五、發明説明（ 成收發雙轉換的功能，因此可以大幅地減低硬體製作的成 本與複雜度。 (請先閲讀背面之注意事項再填寫本頁) 訂 經濟部中央標準局員工消費合作社印製 10 本紙張尺度適用中國國家標準（CNS ) A4規格（210X297公釐）The power amplifier 380 is turned on, and the power amplifier 38Q is turned off when a signal is received. The switch 3 0 3 also includes a signal line 3 3 5 to quickly switch the antenna to the pre-amplifier 311 'when receiving signals under the control of the control unit and quickly switch the antenna to the power amplifier 380 when transmitting signals » The present invention uses an active inverter 37 to increase the frequency of the second intermediate frequency signal to the transmitted signal, so the two-way transmission device in Figure 1 can be responsible) and the high-frequency filter 172 is omitted. And the 'system 30 transmission and reception frequency switching and channel selection are performed by the local oscillator 340' The modulator 360 and the inverter 370 are completed under the control of the control unit, and the traditional double conversion ^ radio transceiver system 10 and system 2 0 phase Compare 'It can reach 9 paper sizes with the fewest components in the Common® National Standard (CNS) M specification (210X2W mm) ---------- ¾ .-- Order • —11— ί / U7: ie A7 B7 V. Description of the invention (It has the function of double conversion of transmission and reception, so it can greatly reduce the cost and complexity of hardware production. (Please read the precautions on the back before filling this page) Set the central standard of the Ministry of Economic Affairs Bureau employee consumer cooperatives seal 10 paper sizes are applicable to China National Standard (CNS) A4 (210X297 mm)