TW201445890A - Reference source optimization circuit, signal generation device and signal generation method - Google Patents
Reference source optimization circuit, signal generation device and signal generation method Download PDFInfo
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本發明有關於一種訊號產生裝置及方法，其利用一優化後的低相位雜訊之參考源作為混頻之震盪源，以快速地產生一低相位雜訊及低偽裝訊號之輸出訊號。
The invention relates to a signal generating device and method, which utilizes an optimized reference source of low phase noise as a mixing source of the mixing to quickly generate an output signal of low phase noise and low camouflage signals.
在雷達的發射與接收系統架構中，本地震盪源(Local Oscillator, LO)的相位雜訊(phase noise)與頻率切換速度一直是系統關注的參數之一。若是考量到接收機有可能受到外界的惡意干擾，頻率切換速度一般都會要求在2us以下，以避免其惡意的追蹤與干擾。目前本地震盪源大都透過一基於鎖相迴路架構所設計的訊號產生裝置來取得。In the radar transmit and receive system architecture, the phase noise and frequency switching speed of the local oscillator (LO) has always been one of the parameters of the system. If it is considered that the receiver may be subject to malicious interference from the outside world, the frequency switching speed will generally be below 2us to avoid malicious tracking and interference. At present, most of the seismic sources are obtained through a signal generating device designed based on a phase-locked loop architecture.
請參閱第1圖，為習用訊號產生裝置之電路架構圖。如圖所示，習用訊號產生裝置100利用鎖相迴路架構進行設計，其包括一相位頻率偵測器11、一充電泵12、一迴路濾波器13、一壓控震盪器14及一除頻器15。Please refer to FIG. 1 , which is a circuit diagram of a conventional signal generating device. As shown, the conventional signal generating device 100 is designed using a phase-locked loop architecture, including a phase frequency detector 11, a charge pump 12, a loop filter 13, a voltage controlled oscillator 14, and a frequency divider. 15.
一外部參考源Fref輸入至相位頻率偵測器11，而壓控震盪器14用以產生一輸出訊號Fout，該輸出訊號Fout用以作為本地震盪源。輸出訊號Fout經過除頻器15的除頻N倍後產生一回授訊號Fback並輸入至相位頻率偵測器11。相位頻率偵測器11用以偵測外部參考源Fref與回授訊號Fback間之相位差異，以產生對應的一相位差訊號(UP/DN)。充電泵12根據相位差訊號(UP/DN)決定充放電的動作，以調升或調降回授濾波器13所產生的工作電壓VF。則，壓控振盪器14即可根據工作電壓VF對應產生輸出訊號Fout。在此，經由負回授的方式不斷地進行修正，以使除頻器15除頻後的回授訊號Fback可以與外部參考源Fref達到相同的相位或頻率。A source external reference frequency F ref input to the phase detector 11, and the VCO 14 for generating an output signal F out, the output signal F out is used as a local oscillation source. The output signal F out is subjected to a frequency division N times of the frequency divider 15 to generate a feedback signal F back and is input to the phase frequency detector 11. The phase frequency detector 11 is configured to detect a phase difference between the external reference source F ref and the feedback signal F back to generate a corresponding phase difference signal (UP/DN). The charge pump 12 determines the charge and discharge operation based on the phase difference signal (UP/DN) to increase or decrease the operating voltage V F generated by the feedback filter 13. Then, the voltage controlled oscillator 14 can generate an output signal F out according to the working voltage V F . Here, the correction is continuously performed by the negative feedback method, so that the feedback signal F back after the frequency divider 15 is demultiplexed can reach the same phase or frequency as the external reference source F ref .
傳統的鎖相迴路在相位雜訊上大都可以取得一令人滿意的結果，然而，鎖定時間往往需要較多的時間，以致頻率切換速度無法過快(大約在12ms左右)而達不到實際的應用要求(如2us以下)。再者，鎖相迴路通常由迴路濾波器13控制整個迴路的頻寬大小，頻寬的大小將會影響整個迴路的鎖定時間(locking time)。若選擇將迴路濾波器13之頻寬放大，確實可以加快迴路的鎖定速度及頻率切換速度，然而，放大迴路濾波器13之頻寬，將使得輸出訊號Fout的相位抖動(Jitter)的情況更加明顯，換言之，輸出訊號Fout的相位雜訊(phase noise)將更加嚴重無法有效地進行抑制。The traditional phase-locked loop can achieve a satisfactory result in phase noise. However, the lock time often takes more time, so the frequency switching speed can not be too fast (about 12ms) and can not reach the actual Application requirements (eg below 2us). Furthermore, the phase-locked loop is usually controlled by the loop filter 13 to control the bandwidth of the entire loop, and the magnitude of the bandwidth will affect the locking time of the entire loop. If the bandwidth of the loop filter 13 to select the amplification, and indeed can accelerate the speed of frequency switching speed lock loop, however, the bandwidth of the amplifier circuit 13 of the filter, so that the phase jitter of the output signal F out (the Jitter) the situation is more obviously, in other words, the phase noise of the output signal F out (phase noise) the more serious can not be effectively suppressed.
此外，迴路濾波器13對於偽裝(spur)訊號具有一定的抑制效果，然而，放大迴路濾波器13之頻寬，將導致相位頻率偵測器11的雜訊無法被迴路濾波器13完全濾除，最後雜訊以偽裝訊號之形式與輸出訊號Fout同時出現在壓控震盪器14之輸出端。故在快速頻率切換、低相位雜訊及低偽裝訊號等等優點無法同時兼得的情況下，傳統的鎖相迴路只能從中取捨一合適的頻寬進行設計。
In addition, the loop filter 13 has a certain suppression effect on the spur signal. However, the bandwidth of the amplification loop filter 13 will cause the noise of the phase frequency detector 11 to be completely filtered out by the loop filter 13. Finally, the noise of the signal in the form of disguised output signal F out simultaneously appear at the output of the voltage controlled oscillator 14. Therefore, in the case that the advantages of fast frequency switching, low phase noise, and low camouflage signals cannot be simultaneously achieved, the conventional phase-locked loop can only be designed by selecting a suitable bandwidth.
本發明之一目的，在於提供一種參考源優化電路，其電路對於一外部輸入的參考源進行相位雜訊的優化程序，以抑制外部參考源之相位雜訊，致使取得一低相位雜訊之本地參考源。It is an object of the present invention to provide a reference source optimization circuit that performs phase noise optimization procedures on an externally input reference source to suppress phase noise of an external reference source, resulting in localization of a low phase noise. Reference source.
本發明之一目的，在於提供一種訊號產生裝置及訊號產生方法，其裝置中設置一直接數位合成電路，直接數位合成電路利用參考源優化電路所提供的一低相位雜訊之本地參考源作為混頻之震盪源，以混頻產生出多個具有低相位雜訊之輸出訊號。An object of the present invention is to provide a signal generating device and a signal generating method, wherein a direct digital synthesizing circuit is disposed in the device, and the direct digital synthesizing circuit uses a local reference source of a low phase noise provided by the reference source optimizing circuit as a hybrid. The frequency oscillating source generates a plurality of output signals with low phase noise by mixing.
本發明之一目的，在於提供一種訊號產生裝置及訊號產生方法，其裝置中的直接數位合成電路係以直接數位合成器及混頻器作為主體架構，將可以加快頻率的切換速度，以快速地混頻產生出多個不同需求頻率之輸出訊號，並達到輸出訊號之頻率快速切換之目的。An object of the present invention is to provide a signal generating device and a signal generating method. The direct digital synthesizing circuit in the device adopts a direct digital synthesizer and a mixer as a main structure, which can speed up the switching speed of the frequency to quickly The mixing produces a plurality of output signals of different required frequencies, and achieves the purpose of quickly switching the frequency of the output signals.
本發明之一目的，在於提供一種訊號產生裝置及訊號產生方法，其裝置中設置一具有濾波功能之輸出訊號選擇電路，此輸出訊號選擇電路可以將非需求頻率之訊號完全濾除，致使以輸出一符合實際需求頻率且具有低相位雜訊、低偽裝訊號特性的輸出訊號。An object of the present invention is to provide a signal generating device and a signal generating method, wherein an output signal selecting circuit having a filtering function is provided in the device, and the output signal selecting circuit can completely filter out the signal of the non-demand frequency, so as to output An output signal that meets the actual demand frequency and has low phase noise and low camouflage signal characteristics.
為了達到上述目的，本發明提供一種參考源優化電路，用以抑制參考源之相位雜訊，包括：一晶體濾波器，用以接收一特定頻率之外部參考源，對於外部參考源進行相位雜訊優化程序；一第一頻率乘法器，連接晶體濾波器，將外部參考源之頻率乘以一第一倍率及/或至少一第二倍率以昇頻產生一第一頻率及/或至少一第二頻率的本地參考源；及一表面聲波濾波單元，連接第一頻率乘法器，對於第一頻率及/或第二頻率的本地參考源進行相位雜訊優化程序，藉以產生具有低相位雜訊之第一頻率及/或第二頻率的本地參考源。In order to achieve the above object, the present invention provides a reference source optimization circuit for suppressing phase noise of a reference source, including: a crystal filter for receiving an external reference source of a specific frequency, and phase noise for an external reference source An optimization program; a first frequency multiplier coupled to the crystal filter, multiplying a frequency of the external reference source by a first rate and/or at least a second rate to generate a first frequency and/or at least a second a local reference source of frequency; and a surface acoustic wave filtering unit coupled to the first frequency multiplier for phase noise optimization procedures for the local reference source of the first frequency and/or the second frequency to generate a low phase noise A local reference source of a frequency and/or a second frequency.
本發明一實施例中，尚包括一前級晶體濾波器及一第一倍頻器，第一倍頻器之一端連接前級晶體濾波器而另一端連接晶體濾波器，其中前級晶體濾波器用以輸入外部參考源，對於外部參考源進行相位雜訊優化程序，第一倍頻器倍頻外部參考源之頻率後傳送至晶體濾波器，第一頻率乘法器將對於倍頻後的外部參考源進一步昇頻。In an embodiment of the invention, a pre-stage crystal filter and a first frequency multiplier are further included. One end of the first frequency multiplier is connected to the pre-stage crystal filter and the other end is connected to the crystal filter, wherein the pre-stage crystal filter is used. To input an external reference source and perform phase noise optimization for the external reference source, the first multiplier multiplies the frequency of the external reference source and transmits it to the crystal filter. The first frequency multiplier will be used for the external reference source after multiplication. Further upswing.
本發明一實施例中，其中晶體濾波器對於外部參考源之中心頻率附近10kHz以內或100kHz以內的頻率偏移進行相位雜訊優化，而表面聲波濾波器對於本地參考源之中心頻率附近10kHz以上或100kHz以上的頻率偏移進行相位雜訊優化。In an embodiment of the invention, the crystal filter performs phase noise optimization for a frequency offset within 10 kHz or within a frequency range of 100 kHz near the center frequency of the external reference source, and the surface acoustic wave filter is above 10 kHz near the center frequency of the local reference source or Phase noise optimization with frequency offset above 100 kHz.
本發明一實施例中，其中前級晶體濾波器對於外部參考源之中心頻率附近1kHz以內的頻率偏移進行相位雜訊優化。In an embodiment of the invention, the pre-stage crystal filter performs phase noise optimization for a frequency offset within 1 kHz near the center frequency of the external reference source.
本發明一實施例中，其中表面聲波濾波單元包括一第一表面聲波濾波器、至少一第二表面聲波濾波器、一第一開關器及一第二開關器，第一開關器連接第一頻率乘法器以接收第一頻率及第二頻率的本地參考源，第一表面聲波濾波器用以通過第一頻率之本地參考源、濾除第二頻率之本地參考源及其他雜訊，第二表面聲波濾波器用以通過第二頻率之本地參考源、濾除第一頻率之本地參考源及其他雜訊，當第一開關器及第二開關器切向第一表面聲波濾波器時，第二開關器輸出第一頻率之本地參考源，當第一開關器及第二開關器切向第二表面聲波濾波器時，第二開關器輸出第二頻率之本地參考源。In an embodiment of the invention, the surface acoustic wave filtering unit includes a first surface acoustic wave filter, at least a second surface acoustic wave filter, a first switch and a second switch, and the first switch is connected to the first frequency. The multiplier receives a local reference source of the first frequency and the second frequency, the first surface acoustic wave filter is configured to pass the local reference source of the first frequency, filter the local reference source of the second frequency, and other noise, the second surface acoustic wave The filter is configured to pass the local reference source of the second frequency, filter the local reference source of the first frequency, and other noise. When the first switch and the second switch are tangential to the first surface acoustic wave filter, the second switch And outputting a local reference source of the first frequency. When the first switch and the second switch are tangential to the second surface acoustic wave filter, the second switch outputs a local reference source of the second frequency.
本發明又提供一種訊號產生裝置，包括：一參考源優化電路，用以輸入一特定頻率之外部參考源，優化外部參考源之相位雜訊，昇頻外部參考源以產生一第一頻率或一第二頻率的本地參考源；一直接數位合成電路，連接參考源優化電路，接收第一頻率或第二頻率的本地參考源，藉由數位方式以第一頻率或第二頻率作為本地參考源調變產生一第三頻率或一第四頻率的類比訊號，混頻第一頻率的本地參考源與第三頻率的類比訊號以產生一第一需求頻率及一第二需求頻率之輸出訊號，或者混頻第二頻率的本地參考源與第四頻率的類比訊號以產生一第三需求頻率及一第四需求頻率之輸出訊號；及一輸出訊號選擇電路，連接直接數位合成電路，接收第一需求頻率、第二需求頻率、第三需求頻率及/或第四需求頻率之輸出訊號，選擇輸出第一需求頻率、第二需求頻率、第三需求頻率或第四需求頻率之輸出訊號之其中之一者。The invention further provides a signal generating device, comprising: a reference source optimization circuit for inputting an external reference source of a specific frequency, optimizing phase noise of the external reference source, and upconverting the external reference source to generate a first frequency or a a local reference source of the second frequency; a direct digital synthesis circuit connected to the reference source optimization circuit to receive the local reference source of the first frequency or the second frequency, and the first frequency or the second frequency is used as the local reference source by the digital mode Generating a third frequency or a fourth frequency analog signal, mixing the local reference source of the first frequency with the analog signal of the third frequency to generate an output signal of the first required frequency and a second required frequency, or mixing The second reference frequency of the second reference frequency and the analog signal of the fourth frequency to generate a third demand frequency and a fourth demand frequency output signal; and an output signal selection circuit connected to the direct digital synthesis circuit to receive the first required frequency Output signal of the second demand frequency, the third demand frequency, and/or the fourth demand frequency, and selects the output first demand frequency, the second One of the output signals of the demand frequency, the third demand frequency, or the fourth demand frequency.
本發明一實施例中，其中直接數位合成電路包括一直接數位合成器及一混頻器，直接數位合成器之其中一端連接參考源優化電路，另一端連接混頻器，其中直接數位合成器利用數位方式以第一頻率或第二頻率作為本地參考源調變產生第三頻率或第四頻率的類比訊號，而混頻器混頻第一頻率的本地參考源與第三頻率的類比訊號以產生第一需求頻率及第二需求頻率之輸出訊號或混頻第二頻率的本地參考源與第四頻率的類比訊號以產生第三需求頻率及第四需求頻率之輸出訊號。In an embodiment of the invention, the direct digital synthesizing circuit comprises a direct digital synthesizer and a mixer, wherein one end of the direct digital synthesizer is connected to the reference source optimization circuit, and the other end is connected to the mixer, wherein the direct digital synthesizer utilizes The digital mode modulates the first frequency or the second frequency as a local reference source to generate an analog signal of the third frequency or the fourth frequency, and the mixer mixes the analog signal of the local reference source of the first frequency with the third frequency to generate The output signal of the first demand frequency and the second demand frequency or the analog signal of the local reference source and the fourth frequency of the second frequency are mixed to generate an output signal of the third required frequency and the fourth required frequency.
本發明一實施例中，其中直接數位合成電路尚包括一第二倍頻器，其設置在直接數位合成器及混頻器之間，第二倍頻器用以倍頻第三頻率或第四頻率的類比訊號。In an embodiment of the invention, the direct digital synthesizing circuit further includes a second frequency multiplier disposed between the direct digital synthesizer and the mixer, and the second frequency multiplier is used to multiply the third frequency or the fourth frequency. Analog signal.
本發明一實施例中，其中直接數位合成器及第二倍頻器間設置一低通/帶通濾波器，而第二倍頻器及混頻器間設置一帶通濾波器。In an embodiment of the invention, a low pass/band pass filter is disposed between the direct digital synthesizer and the second frequency multiplier, and a band pass filter is disposed between the second frequency multiplier and the mixer.
本發明一實施例中，其中輸出訊號選擇電路包括：多個高階濾波器，各高階濾波器分別用以通過不同需求頻率之輸出訊號；一第一開關選擇器，其包括一輸入端及多個輸出端，第一開關選擇器之輸入端連接直接數位合成電路用以接收第一需求頻率、第二需求頻率、第三需求頻率及/或第四需求頻率之輸出訊號，第一開關選擇器之各輸出端分別連接對應的高階濾波器之輸入；及一第二開關選擇器，其包括多個輸入端及一輸出端，第二開關選擇器之各輸入端分別連接對應的高階濾波器之輸出，第一開關選擇器之輸出端用以選擇輸出第一需求頻率、第二需求頻率、第三需求頻率或第四需求頻率之輸出訊號；其中，當輸出訊號選擇電路選擇輸出第一需求頻率、第二需求頻率、第三需求頻率或第四需求頻率之輸出訊號時，相對控制第一開關選擇器及第二開關選擇器切向第一需求頻率、第二需求頻率、第三需求頻率或第四需求頻率之輸出訊號所對應的高階濾波器，以使被選擇輸出的第一需求頻率、第二需求頻率、第三需求頻率或第四需求頻率之輸出訊號可以從對應的高階濾波器通過。In an embodiment of the invention, the output signal selection circuit includes: a plurality of high-order filters, each of which is configured to output an output signal of a different demand frequency; and a first switch selector including an input end and a plurality of The output end of the first switch selector is connected to the direct digital synthesizing circuit for receiving the output signals of the first required frequency, the second required frequency, the third required frequency, and/or the fourth required frequency, and the first switch selector Each output terminal is respectively connected to an input of a corresponding high-order filter; and a second switch selector includes a plurality of input ends and an output end, and each input end of the second switch selector is respectively connected to an output of the corresponding higher-order filter The output end of the first switch selector is configured to select an output signal for outputting the first required frequency, the second required frequency, the third required frequency, or the fourth required frequency; wherein, when the output signal selecting circuit selects and outputs the first required frequency, Relatively controlling the first switch selector and the second switch when the output signal of the second demand frequency, the third demand frequency or the fourth demand frequency is Off-selecting a high-order filter corresponding to an output signal of the first required frequency, the second required frequency, the third required frequency, or the fourth required frequency, so that the first required frequency, the second required frequency, and the selected output are selected The output signal of the third demand frequency or the fourth demand frequency may pass through the corresponding higher order filter.
本發明一實施例中，其中輸出訊號選擇電路尚包括一第一帶拒濾波器、一第二帶拒濾波器、一第三開關器及一第四開關器，第三開關器之其中一端連接直接數位合成電路而另一端選擇連接第一帶拒濾波器或第二帶拒濾波器，第四開關器之其中一端選擇連接第一帶拒濾波器或第二帶拒濾波器而另一端連接第一開關選擇器，當第三開關器及第四開關器選擇切向第一帶拒濾波器時，利用第一帶拒濾波器濾除掉從直接數位合成電路所接收的第一頻率之本地參考源，當第三開關器及第四開關器選擇切向第二帶拒濾波器時，利用第二帶拒濾波器濾除掉從直接數位合成電路所接收的第二頻率之本地參考源。In an embodiment of the invention, the output signal selection circuit further includes a first rejection filter, a second rejection filter, a third switch, and a fourth switch, wherein one end of the third switch is connected a direct digital synthesis circuit and the other end is selectively connected to the first rejection filter or the second rejection filter. One end of the fourth switch is connected to the first rejection filter or the second rejection filter and the other end is connected. a switch selector for filtering the local reference of the first frequency received from the direct digital synthesis circuit by using the first band rejection filter when the third switch and the fourth switch select the tangential first band rejection filter The source, when the third switch and the fourth switch select the tangential second band rejection filter, the second band rejection filter is used to filter out the local reference source of the second frequency received from the direct digital synthesis circuit.
本發明一實施例中，其中輸出訊號選擇電路之輸出端尚連接一第二頻率乘法器，第二頻率乘法器用以將輸出訊號選擇電路所選擇輸出的第一需求頻率、第二需求頻率、第三需求頻率或第四需求頻率之輸出訊號乘以一第三倍率以取得一操作頻率更高的輸出訊號。In an embodiment of the invention, the output of the output signal selection circuit is connected to a second frequency multiplier, and the second frequency multiplier is configured to output the first required frequency, the second required frequency, and the second selected frequency of the output signal selection circuit. The output signal of the three demand frequency or the fourth demand frequency is multiplied by a third magnification to obtain an output signal with a higher operating frequency.
本發明又提供一種訊號產生方法，步驟包括：輸入一特定頻率之外部參考源；優化外部參考源之相位雜訊；昇頻外部參考源以輸出一第一頻率或一第二頻率的本地參考源；利用數位方式以第一頻率或第二頻率作為本地參考源調變產生轉換出一第三頻率或一第四頻率的類比訊號；混頻第一頻率的本地參考源與第三頻率的類比訊號以產生一第一需求頻率及一第二需求頻率之輸出訊號或混頻第二頻率的本地參考源與第四頻率的類比訊號以產生一第三需求頻率及一第四需求頻率之輸出訊號；及從第一需求頻率、第二需求頻率、第三需求頻率或第四需求頻率之輸出訊號中選擇其中一進行輸出。The invention further provides a signal generating method, the method comprising: inputting an external reference source of a specific frequency; optimizing phase noise of the external reference source; and upconverting the external reference source to output a local reference source of the first frequency or a second frequency Using a digital method to use a first frequency or a second frequency as a local reference source modulation to generate an analog signal that converts a third frequency or a fourth frequency; mixing the analog signal of the local reference source and the third frequency of the first frequency Generating a first demand frequency and a second demand frequency output signal or mixing the second frequency of the local reference source and the fourth frequency analog signal to generate a third demand frequency and a fourth demand frequency output signal; And selecting one of the output signals of the first demand frequency, the second demand frequency, the third demand frequency or the fourth demand frequency to perform output.
本發明一實施例中，其中外部參考源進行一第一級相位雜訊優化程序，以對於外部參考源之中心頻率附近1kHz以內的頻率偏移進行相位雜訊優化。In an embodiment of the invention, the external reference source performs a first-stage phase noise optimization procedure to perform phase noise optimization for a frequency offset within 1 kHz near a center frequency of the external reference source.
本發明一實施例中，其中外部參考源進行一倍頻程序，倍頻後之外部參考源進行一第二級相位雜訊優化程序，以對於倍頻後之外部參考源之中心頻率附近10kHz或100kHz以內的頻率偏移進行相位雜訊優化。In an embodiment of the invention, the external reference source performs a frequency doubling procedure, and the multiplied external reference source performs a second-stage phase noise optimization procedure to 10 kHz near the center frequency of the external reference source after frequency doubling or Phase noise optimization with a frequency offset of less than 100 kHz.
本發明一實施例中，其中本地參考源進行一第三級相位雜訊優化程序，以對於本地參考源之中心頻率附近10kHz或100kHz以上的頻率偏移進行相位雜訊優化。In an embodiment of the invention, the local reference source performs a third-stage phase noise optimization procedure to perform phase noise optimization for a frequency offset of 10 kHz or more near the center frequency of the local reference source.
本發明一實施例中，其中第三頻率或第四頻率的類比訊號經過一倍頻程序，利用倍頻後的第三頻率的類比訊號與第一頻率的本地參考源混頻或利用倍頻後的第四頻率的類比訊號與第二頻率的本地參考源混頻。
In an embodiment of the invention, the analog signal of the third frequency or the fourth frequency is subjected to a frequency doubling procedure, and the analog signal of the third frequency after the frequency multiplication is mixed with the local reference source of the first frequency or after the frequency doubling The analog signal of the fourth frequency is mixed with the local reference source of the second frequency.
100．．．訊號產生裝置100. . . Signal generating device
11．．．相位頻率偵測器11. . . Phase frequency detector
12．．．充電泵12. . . Charge pump
13．．．迴路濾波器13. . . Loop filter
14．．．壓控震盪器14. . . Voltage controlled oscillator
15．．．除頻器15. . . Frequency divider
200．．．訊號產生裝置200. . . Signal generating device
20．．．參考源優化電路20. . . Reference source optimization circuit
21．．．前級晶體濾波器twenty one. . . Pre-stage crystal filter
22．．．第一倍頻器twenty two. . . First frequency multiplier
23．．．晶體濾波器twenty three. . . Crystal filter
24．．．第一頻率乘法器twenty four. . . First frequency multiplier
25．．．表面聲波濾波單元25. . . Surface acoustic wave filtering unit
251．．．第一開關器251. . . First switch
252．．．第一表面聲波濾波器252. . . First surface acoustic wave filter
253．．．第二表面聲波濾波器253. . . Second surface acoustic wave filter
254．．．第二開關器254. . . Second switch
30．．．直接數位合成電路30. . . Direct digital synthesis circuit
31．．．直接數位合成器31. . . Direct digital synthesizer
32．．．低通/帶通濾波器32. . . Low pass / band pass filter
33．．．第二倍頻器33. . . Second frequency multiplier
34．．．帶通濾波器34. . . Bandpass filter
35．．．混頻器35. . . Mixer
40．．．輸出訊號選擇電路40. . . Output signal selection circuit
411．．．第三開關器411. . . Third switch
412．．．第一帶拒濾波器412. . . First rejection filter
413．．．第二帶拒濾波器413. . . Second rejection filter
414．．．第四開關器414. . . Fourth switch
42．．．第一開關選擇器42. . . First switch selector
431．．．高階濾波器431. . . Higher order filter
432．．．高階濾波器432. . . Higher order filter
433．．．高階濾波器433. . . Higher order filter
434．．．高階濾波器434. . . Higher order filter
44．．．第二開關選擇器44. . . Second switch selector
45．．．第二頻率乘法器45. . . Second frequency multiplier
第１圖：習用訊號產生裝置之電路架構圖。
第２圖：本發明訊號產生裝置之一較佳實施例之區塊示意圖。
第３圖：本發明參考源優化電路之一較佳實施例之電路結構示意圖。
第４圖：本發明直接數位合成電路之一較佳實施例之電路結構示意圖。
第５圖：本發明輸出訊號選擇電路之一較佳實施例之電路結構示意圖。
Figure 1: Circuit diagram of the conventional signal generating device.
Fig. 2 is a block diagram showing a preferred embodiment of a signal generating device of the present invention.
Figure 3 is a schematic diagram showing the circuit structure of a preferred embodiment of the reference source optimization circuit of the present invention.
Fig. 4 is a circuit diagram showing a preferred embodiment of a direct digital synthesizing circuit of the present invention.
Figure 5 is a block diagram showing the circuit structure of a preferred embodiment of the output signal selection circuit of the present invention.
請參閱第２圖，為本發明訊號產生裝置之一較佳實施例之區塊示意圖。如圖所示，本發明訊號產生裝置200包括一參考源優化電路20、一直接數位合成電路30及一輸出訊號選擇電路40，參考源優化電路20依序連接直接數位合成電路30及輸出訊號選擇電路40。Please refer to FIG. 2, which is a block diagram of a preferred embodiment of the signal generating device of the present invention. As shown in the figure, the signal generating apparatus 200 of the present invention includes a reference source optimizing circuit 20, a direct digital synthesizing circuit 30 and an output signal selecting circuit 40. The reference source optimizing circuit 20 sequentially connects the direct digital synthesizing circuit 30 and the output signal selection. Circuit 40.
其中一特定頻率之外部參考源Fref將輸入至參考源優化電路20之中，參考源優化電路20對於外部參考源Fref進行相位雜訊優化及昇頻，以產生一第一頻率或一第二頻率之本地參考源LO1/LO2。直接數位合成電路30接收第一頻率或一第二頻率之本地參考源LO1/LO2，利用數位方式以第一頻率或第二頻率作為本地參考源LO1/LO2而調變產生一第三頻率或一第四頻率的類比訊號AN3/AN4，將第一頻率或第二頻率的本地參考源LO1/LO2與第三頻率或第四頻率的類比訊號AN3/AN4進行混頻，以產生多個不同需求頻率之輸出訊號Fout(1-4)。最後，輸出訊號選擇電路40可以根據於實際的應用要求將直接數位合成電路30所產生的多個需求頻率之輸出訊號Fout(1-4)選擇其中一進行輸出。則，本發明訊號產生裝置200利用優化之本地參考源LO1/LO2作為混頻的震盪源，即可順利取得一低相位雜訊及低偽裝訊號之輸出訊號Fout。An external reference source Fref of a specific frequency is input to the reference source optimization circuit 20, and the reference source optimization circuit 20 performs phase noise optimization and up-conversion on the external reference source Fref to generate a first frequency or a second frequency. Local reference source LO 1 /LO 2 . The direct digital synthesizing circuit 30 receives the local reference source LO 1 /LO 2 of the first frequency or a second frequency, and uses a digital method to modulate the first frequency or the second frequency as the local reference source LO 1 /LO 2 to generate a first The analog signal AN 3 /AN 4 of the three frequency or a fourth frequency performs the local reference source LO 1 /LO 2 of the first frequency or the second frequency and the analog signal AN 3 /AN 4 of the third frequency or the fourth frequency Mixing to generate multiple output signals Fout(1-4) of different demand frequencies. Finally, the output signal selection circuit 40 can select one of the output signals Fout(1-4) of the plurality of required frequencies generated by the direct digital synthesizing circuit 30 to output one according to actual application requirements. Then, the signal generating apparatus 200 of the present invention can obtain a low phase noise and a low camouflage signal output signal Fout by using the optimized local reference source LO 1 /LO 2 as the mixing source of the mixing.
再者，本發明參考源優化電路20、直接數位合成電路30及輸出訊號選擇電路40之電路結構及電路操作，其詳細解說如下所述：Furthermore, the circuit structure and circuit operation of the reference source optimization circuit 20, the direct digital synthesis circuit 30, and the output signal selection circuit 40 of the present invention are explained in detail as follows:
首先，請參閱第３圖為參考源優化電路之一較佳實施例之電路結構示意圖。如圖所示，參考源優化電路20之詳細電路結構包括一晶體濾波器23、一第一頻率乘法器24及一表面聲波濾波單元25，晶體濾波器23依序連接第一頻率乘法器24及表面聲波濾波單元25。外部參考源Fref將輸入至參考源優化電路20之中，在此，本發明所述的外部參考源Fref將以60MHz之訊號源作為一範例解說。First, please refer to FIG. 3, which is a schematic diagram of a circuit structure of a preferred embodiment of a reference source optimization circuit. As shown, the detailed circuit structure of the reference source optimization circuit 20 includes a crystal filter 23, a first frequency multiplier 24, and a surface acoustic wave filtering unit 25. The crystal filter 23 sequentially connects the first frequency multiplier 24 and Surface acoustic wave filtering unit 25. The external reference source Fref will be input to the reference source optimization circuit 20, where the external reference source Fref of the present invention will be explained with a 60 MHz signal source as an example.
晶體濾波器23用以接收外部參考源Fref，對於外部參考源Fref進行相位雜訊優化程序，以將外部參考源Fref之中心頻率(60MHz)附近10kHz或100kHz以內的頻率偏移(±10kHz or ±100kHz offset)進行優化，而抑制外部參考源Fref的相位雜訊(或稱之為相位抖動)。The crystal filter 23 is configured to receive an external reference source Fref, and perform a phase noise optimization procedure on the external reference source Fref to offset the frequency within 10 kHz or 100 kHz of the center frequency (60 MHz) of the external reference source Fref (±10 kHz or ± 100kHz offset) is optimized to suppress phase noise (or phase jitter) of the external reference source Fref.
外部參考源Fref經過晶體濾波器23之相位雜訊優化程序後，將傳送至第一頻率乘法器24。第一頻率乘法器24設定有一第一倍率N1及/或至少一第二倍率N2，將外部參考源Fref之頻率乘以第一倍率N1以產生第一頻率(Fref×N1)之本地參考源LO1，或者將外部參考源Fref之頻率乘以第二倍率N2以產生一第二頻率(Fref×N2)之本地參考源(LO2)。The external reference source Fref is passed to the first frequency multiplier 24 after passing through the phase noise optimization procedure of the crystal filter 23. The first frequency multiplier 24 is configured to have a first magnification N 1 and/or at least a second magnification N 2 , and multiply the frequency of the external reference source Fref by the first magnification N 1 to generate a first frequency (Fref×N 1 ). local reference source LO 1, or an external reference frequency Fref source of N 2 by a second ratio to generate a second frequency (Fref × N 2) of a local reference source (LO 2).
表面聲波濾波單元25接收第一頻率及/或第二頻率之本地參考源LO1、LO2後，對於第一頻率及/或第二頻率之本地參考源LO1、LO2進行相位雜訊優化程序，以將本地參考源LO1/LO2之中心頻率(Fref×N1/Fref×N2)附近10kHz或100kHz以上的頻率偏移(±10kHz or ±100kHz offset)進行優化，而抑制本地參考源LO1/LO2的相位雜訊。A surface acoustic wave filter unit 25 receives a first frequency and / or the second local frequency reference source LO 1, the LO 2, for the first local frequency and / or the second frequency reference source LO 1, LO 2 for phase noise optimization a program to optimize the frequency offset (±10 kHz or ±100 kHz offset) near the center frequency (Fref×N 1 /Fref×N 2 ) of the local reference source LO 1 /LO 2 (±10 kHz or ±100 kHz offset) while suppressing the local reference Phase noise of source LO 1 /LO 2 .
本發明表面聲波濾波單元25之結構主要包括一第一開關器251、一第一表面聲波濾波器252、至少一第二表面聲波濾波器253及一第二開關器254。第一開關器251連接第一頻率乘法器24以接收第一頻率及第二頻率的本地參考源LO1、LO2。在本發明實施例中，第一表面聲波濾波器252主要用以通過第一頻率之本地參考源LO1並濾除掉其他的訊號源(如第二頻率之本地參考源LO2)，而第二表面聲波濾波器253主要用以通過第二頻率之本地參考源LO2並濾除掉其他的訊號源(如第一頻率之本地參考源LO1)。The structure of the surface acoustic wave filtering unit 25 of the present invention mainly includes a first switch 251, a first surface acoustic wave filter 252, at least a second surface acoustic wave filter 253, and a second switch 254. The first switch 251 is coupled to the first frequency multiplier 24 to receive local reference sources LO 1 , LO 2 of the first and second frequencies. In the embodiment of the present invention, the first surface acoustic wave filter 252 is mainly used to pass the local reference source LO 1 of the first frequency and filter out other signal sources (such as the local reference source LO 2 of the second frequency), and The two surface acoustic wave filter 253 is mainly used to pass the local reference source LO 2 of the second frequency and filter out other signal sources (such as the local reference source LO 1 of the first frequency).
當第一開關器251及第二開關器254選擇切向第一表面聲波濾波器252時，第一頻率之本地參考源LO1及第二頻率的本地參考源LO2經過第一開關器251以進入第一表面聲波濾波器252，第一頻率之本地參考源LO1將通過第一表面聲波濾波器252以從第二開關器254進行輸出，而第二頻率的本地參考源LO2將會被第一表面聲波濾波器252濾除。反之，當第一開關器251及第二開關器254選擇切向第二表面聲波濾波器253時，第一頻率之本地參考源LO1及第二頻率的本地參考源LO2經過第一開關器251以進入第二表面聲波濾波器253，第二頻率之本地參考源LO2將通過第二表面聲波濾波器253以從第二開關器254進行輸出，而第一頻率的本地參考源LO1將會被第二表面聲波濾波器253濾除。When the first switch 251 and the second switch 254 select the tangential first surface acoustic wave filter 252, the local reference source LO 1 of the first frequency and the local reference source LO 2 of the second frequency pass through the first switch 251. Entering the first surface acoustic wave filter 252, the local reference source LO 1 of the first frequency will pass through the first surface acoustic wave filter 252 for output from the second switch 254, and the local reference source LO 2 of the second frequency will be The first surface acoustic wave filter 252 filters out. On the contrary, when the first switch 251 and the second switch 254 select the tangential second surface acoustic wave filter 253, the local reference source LO 1 of the first frequency and the local reference source LO 2 of the second frequency pass through the first switch 251 to enter the second surface acoustic wave filter 253, the local reference source LO 2 of the second frequency will pass through the second surface acoustic wave filter 253 to output from the second switch 254, and the local reference source LO 1 of the first frequency will It will be filtered by the second surface acoustic wave filter 253.
又，本發明一較佳實施例中，於晶體濾波器23之前端進一步設置一前級晶體濾波器21及一第一倍頻器22。第一倍頻器22之一端連接晶體濾波器23而另一端連接前級晶體濾波器21，外部參考源Fref將從前級晶體濾波器21進行輸入。前級晶體濾波器21對於所輸入的外部參考源Fref進行一前級的相位雜訊優化程序，以將外部參考源Fref之中心頻率(60MHz)附近1kHz以內的頻率偏移(±1kHz offset)進行優化。外部參考源Fref經過前級晶體濾波器21之前級相位雜訊優化程序後，將傳送至第一倍頻器22，以對於外部參考源Fref之頻率進行倍頻而取得倍頻後之外部參考源Fref (60MHz×2=120MHz)。而後，同樣地，倍頻後之外部參考源(Fref×2=120MHz)也會經過晶體濾波器23的相位雜訊優化及頻率乘法器24之昇頻，而在表面聲波濾波單元25之輸出端輸出第一頻率或第二頻率的本地參考源LO1/LO2。在此，藉由前級晶體濾波器21之增設，將可對於外部參考源Fref進行更小單位的頻率偏移(±1kHz offset)優化，而令外部參考源Fref之相位雜訊能夠真正的有效地被抑制下來。Moreover, in a preferred embodiment of the present invention, a pre-stage crystal filter 21 and a first frequency multiplier 22 are further disposed at the front end of the crystal filter 23. One end of the first frequency multiplier 22 is connected to the crystal filter 23 and the other end is connected to the pre-stage crystal filter 21, and the external reference source Fref is input from the pre-stage crystal filter 21. The pre-stage crystal filter 21 performs a pre-stage phase noise optimization procedure on the input external reference source Fref to shift the frequency (±1 kHz offset) within 1 kHz of the center frequency (60 MHz) of the external reference source Fref. optimization. After the external reference source Fref passes through the previous stage phase noise optimization program of the pre-stage crystal filter 21, it is transmitted to the first frequency multiplier 22 to multiply the frequency of the external reference source Fref to obtain the multiplied external reference source. Fref (60MHz × 2 = 120MHz). Then, similarly, the multiplied external reference source (Fref×2=120 MHz) is also subjected to the phase noise optimization of the crystal filter 23 and the up-conversion of the frequency multiplier 24, and at the output of the surface acoustic wave filtering unit 25. A local reference source LO 1 /LO 2 of the first frequency or the second frequency is output. Here, by the addition of the pre-stage crystal filter 21, the frequency offset (±1 kHz offset) of the smaller reference unit Fref can be optimized, and the phase noise of the external reference source Fref can be truly effective. The ground is suppressed.
本發明一具體實施例中，假設第一頻率乘法器24所設定的第一倍率N1為八倍、第二倍率N2為七倍，並且外部參考源Fref之頻率也經過第一倍頻器22的倍頻動作。則，第一頻率乘法器24所產生的本地參考源LO1其第一頻率將可為960MHz(60MHz×2×8)，本地參考源LO2其第二頻率將可為840MHz(60MHz×2×7)。而後，第一頻率乘法器24所產生的960MHz之本地參考源LO1及840MHz之本地參考源LO2傳送至表面聲波濾波單元25，以透過表面聲波濾波單元25選擇960MHz的本地參考源LO1或840MHz的本地參考源 LO2進行輸出。In an embodiment of the present invention, it is assumed that the first magnification N 1 set by the first frequency multiplier 24 is eight times and the second magnification N 2 is seven times, and the frequency of the external reference source Fref also passes through the first frequency multiplier. 22 multiplier action. Then, the local reference source LO 1 generated by the first frequency multiplier 24 may have a first frequency of 960 MHz (60 MHz x 2 x 8), and the local reference source LO 2 may have a second frequency of 840 MHz (60 MHz x 2 x). 7). Then, the local reference source LO 1 of 960 MHz generated by the first frequency multiplier 24 and the local reference source LO 2 of 840 MHz are transmitted to the surface acoustic wave filtering unit 25 to select the local reference source LO 1 of 960 MHz through the surface acoustic wave filtering unit 25 or The local reference source LO 2 of 840MHz is output.
本發明參考源優化電路20對於外部參考源Fref經過兩次或三次的相位雜訊優化動作後，將可以有效地抑制其相位雜訊，且同時對於外部參考源Fref進行昇頻動作程序，藉以提供一具有低相位雜訊且符合實際需求頻率的本地參考源LO1/ LO2。After the reference source optimization circuit 20 performs two or three phase noise optimization operations on the external reference source Fref, the phase noise can be effectively suppressed, and at the same time, the external reference source Fref is subjected to an up-converting operation program, thereby providing A local reference source LO 1 / LO 2 with low phase noise and meeting the actual required frequency.
再者，本發明具體實施例中，雖揭示外部參考源Fref經過第一倍頻器22及第一頻率乘法器24的兩次昇頻動作。但，實際電路操作也可以只透過第一頻率乘法器24進行一次性的昇頻，在此，同為本發明欲主張的權利範圍之中。又，上述第一倍率及第二倍率所設定的數值僅為方便於本發明的解說，熟知該技藝者應可得知為了取得不同頻率範圍之本地參考源LO1/ LO2亦可相對地調整第一倍率及第二倍率之數值大小。又，本發明第一頻率乘法器24設定有兩個倍率乘數，然，也可以只設定一個倍率乘數而取得單一個本地參考源LO，或者進一步設定有兩個以上的倍率乘數以取得更多個不同頻率的本地參考源LO。Moreover, in the specific embodiment of the present invention, the two up-converting actions of the external reference source Fref through the first frequency multiplier 22 and the first frequency multiplier 24 are disclosed. However, the actual circuit operation can also be performed by the first frequency multiplier 24 for one-time up-conversion, which is within the scope of the claims of the present invention. Moreover, the values set by the first magnification and the second magnification are only for convenience of the description of the present invention. It is well known to those skilled in the art that the local reference source LO 1 / LO 2 for different frequency ranges can be relatively adjusted. The magnitude of the first magnification and the second magnification. Moreover, the first frequency multiplier 24 of the present invention is configured with two multiplying multipliers. Alternatively, only one multiplying multiplier may be set to obtain a single local reference source LO, or two or more multiplying multipliers may be further set to obtain More local reference source LOs of different frequencies.
請參閱第４圖為本發明直接數位合成電路之一較佳實施例之電路結構示意圖。如圖所示，直接數位合成電路30包括一直接數位合成器(Direct Digital Synthesizer；DDS)31及一混頻器35。直接數位合成器31主要以一數位類比轉換器(Digital to Analog Converter；DAC)及一相位累加器作為組成構件，其中一端連接參考源優化電路20之第二開關器254，另一端連接混頻器35。Please refer to FIG. 4 is a schematic diagram showing the circuit structure of a preferred embodiment of the direct digital synthesizing circuit of the present invention. As shown, the direct digital synthesizing circuit 30 includes a direct digital synthesizer (DDS) 31 and a mixer 35. The direct digital synthesizer 31 mainly uses a digital to analog converter (DAC) and a phase accumulator as components, one end of which is connected to the second switch 254 of the reference source optimization circuit 20, and the other end is connected to the mixer. 35.
當參考源優化電路20選擇輸出第一頻率之本地參考源LO1時，直接數位合成器31將會接收到第一頻率之本地參考源LO1。直接數位合成器31利用數位方式以第一頻率作為本地參考源LO1調變產生一第三頻率之類比訊號AN3。之後，混頻器35以第一頻率之本地參考源LO1作為混頻的震盪源，將第一頻率之本地參考源LO1與第三頻率之類比訊號AN3進行混頻，而混頻產生一第一需求頻率(LO1＋AN3)之輸出訊號Fout(1)及一第二需求頻率(LO1－AN3)之輸出訊號Fout(2)。When the reference source optimization circuit 20 selects the local reference source LO 1 that outputs the first frequency, the direct digital synthesizer 31 will receive the local reference source LO 1 of the first frequency. The direct digital synthesizer 31 uses the digital mode to modulate the first frequency as the local reference source LO 1 to generate a third frequency analog signal AN 3 . Thereafter, the mixer 35 uses the local reference source LO 1 of the first frequency as the mixing source of the mixing, and mixes the local reference source LO 1 of the first frequency with the analog signal AN 3 of the third frequency, and the mixing generates The output signal Fout(1) of the first demand frequency (LO 1 +AN 3 ) and the output signal Fout(2) of the second demand frequency (LO 1 -AN 3 ).
或者，當參考源優化電路20選擇輸出第二頻率之本地參考源LO2時，直接數位合成器31將會接收到第二頻率之本地參考源LO2。直接數位合成器31利用數位方式以第二頻率作為本地參考源LO2調變產生一第四頻率之類比訊號AN4。之後，混頻器35以第二頻率之本地參考源LO2作為混頻的震盪源，將第二頻率之本地參考源LO2與第四頻率之類比訊號AN4進行混頻，而混頻產生一第三需求頻率(LO2＋AN4)之輸出訊號Fout(3)及一第四需求頻率(LO2－AN4)之輸出訊號Fout(4)。Alternatively, when the reference source optimization circuit 20 selects the local reference source LO 2 that outputs the second frequency, the direct digital synthesizer 31 will receive the local reference source LO 2 of the second frequency. The direct digital synthesizer 31 uses the digital mode to modulate the second frequency as the local reference source LO 2 to generate a fourth frequency analog signal AN 4 . Thereafter, the mixer 35 uses the local reference source LO 2 of the second frequency as the mixing source of the mixing, and mixes the local reference source LO 2 of the second frequency with the analog signal AN 4 of the fourth frequency, and the mixing generates a third required frequency (LO 2 + aN 4) of the output signal Fout (3) and a fourth desired frequency (LO 2 -AN 4) of the output signal Fout (4).
本發明另一實施例中，直接數位合成電路30尚包括一第二倍頻器33，其設置在直接數位合成器31與混頻器35之間。第二倍頻器33用以倍頻第三頻率或第四頻率之類比訊號AN3/AN4。之後，混頻器35再利用倍頻後的類比訊號AN3/AN4與本地參考源LO1/ LO2進行混頻。In another embodiment of the present invention, the direct digital synthesizing circuit 30 further includes a second frequency multiplier 33 disposed between the direct digital synthesizer 31 and the mixer 35. The second frequency multiplier 33 is used to multiply the analog signal AN 3 /AN 4 of the third frequency or the fourth frequency. Thereafter, the mixer 35 performs mixing with the local reference source LO 1 / LO 2 using the multiplied analog signal AN 3 /AN 4 .
本發明又一實施例中，直接數位合成器31及第二倍頻器33間設置一低通/帶通濾波器32，而第二倍頻器33及混頻器35間設置一帶通濾波器34。低通/帶通濾波器32及帶通濾波器34分別只容許類比訊號AN3/AN4及倍頻後之類比訊號AN3/AN4通過，並將其他頻率訊號源進行濾除，以避免其他頻率訊號源跟隨著類比訊號AN3/AN4傳送至混頻器35而以偽裝形式出現在混頻器35所產生的輸出訊號Fout(1-4)之中。In another embodiment of the present invention, a low pass/band pass filter 32 is disposed between the direct digital synthesizer 31 and the second frequency multiplier 33, and a band pass filter is disposed between the second frequency multiplier 33 and the mixer 35. 34. The low pass/band pass filter 32 and the band pass filter 34 respectively allow only the analog signal AN 3 /AN 4 and the analog signal AN 3 /AN 4 after the multiplication to pass, and filter other frequency signal sources to avoid The other frequency signal sources are transmitted to the mixer 35 following the analog signal AN 3 /AN 4 and appear in camouflage form in the output signal Fout (1-4) generated by the mixer 35.
在此，本發明訊號產生裝置200利用直接數位合成器31及混頻器35作為主體架構，並以數位方式進行本地參考源LO1/LO2之調變以加快頻率切換的速度，而快速地混頻取得多個不同需求頻率之輸出訊號Fout(1-4)。此外，直接數位合成電路30利用參考源優化電路20所提供的一低相位雜訊之本地參考源LO1/LO2作為混頻之震盪源，其混頻產生的輸出訊號Fout(1-4)將具有低相位雜訊的特點。Here, the signal generating apparatus 200 of the present invention uses the direct digital synthesizer 31 and the mixer 35 as a main structure, and performs local reference source LO 1 /LO 2 modulation in a digital manner to speed up the frequency switching, and quickly Mixing to obtain a number of different output frequencies of the output signal Fout (1-4). In addition, the direct digital synthesizing circuit 30 uses the local reference source LO 1 /LO 2 of the low-phase noise provided by the reference source optimization circuit 20 as the mixing source of the mixing, and the output signal Fout (1-4) generated by the mixing. Will have the characteristics of low phase noise.
請參閱第５圖為本發明輸出訊號選擇電路之一較佳實施例之電路結構示意圖。如圖所示，輸出訊號選擇電路40包括一第一開關選擇器42、多個高階濾波器431、432、433、434及一第二開關選擇器44。Please refer to FIG. 5, which is a schematic structural diagram of a circuit of a preferred embodiment of the output signal selection circuit of the present invention. As shown, the output signal selection circuit 40 includes a first switch selector 42, a plurality of higher order filters 431, 432, 433, 434 and a second switch selector 44.
第一開關選擇器42亦可為一解多工器，其包括一輸入端及多個輸出端。第一開關選擇器42之輸入端連接直接數位合成電路30之混頻器35，而第一開關選擇器42之各輸出端分別連接對應的高階濾波器431、432、433、434之輸入。第二開關選擇器44亦可為一多工器，其包括多個輸入端及一輸出端。第二開關選擇器44之各輸入端分別連接對應的高階濾波器431、432、433、434之輸出，而第二開關選擇器44之輸出端將用以選擇輸出一輸出訊號Fout。此外，本發明各高階濾波器431、432、433、434相似於帶通濾波器之功效，分別用以通過某一頻率範圍內的訊號Fout(1-4)，例如：輸出訊號Fout(1)之第一需求頻率落在高階濾波器431所制定的頻率範圍內，則輸出訊號Fout(1)將可以從高階濾波器431通過；輸出訊號Fout(2)之第二需求頻率落在高階濾波器432所制定的頻率範圍內，則輸出訊號Fout(2)將可以從高階濾波器432通過；輸出訊號Fout(3)之第三需求頻率落在高階濾波器433所制定的頻率範圍內，則輸出訊號Fout(3)將可以從高階濾波器433通過；輸出訊號Fout(4)之第四需求頻率落在高階濾波器434所制定的頻率範圍內，則輸出訊號Fout(4)將可以從高階濾波器434通過。The first switch selector 42 can also be a demultiplexer that includes an input and a plurality of outputs. The input of the first switch selector 42 is coupled to the mixer 35 of the direct digital synthesizing circuit 30, and the respective outputs of the first switch selector 42 are coupled to the inputs of the corresponding higher order filters 431, 432, 433, 434, respectively. The second switch selector 44 can also be a multiplexer including a plurality of inputs and an output. The input ends of the second switch selector 44 are respectively connected to the outputs of the corresponding high-order filters 431, 432, 433, 434, and the output of the second switch selector 44 is used to select and output an output signal Fout. In addition, the high-order filters 431, 432, 433, and 434 of the present invention are similar to the functions of the band-pass filter for respectively transmitting signals Fout(1-4) in a certain frequency range, for example, the output signal Fout(1) The first required frequency falls within the frequency range defined by the high-order filter 431, and the output signal Fout(1) will pass through the high-order filter 431; the second required frequency of the output signal Fout(2) falls on the high-order filter. In the frequency range defined by 432, the output signal Fout(2) will pass through the high-order filter 432; the third required frequency of the output signal Fout(3) falls within the frequency range defined by the high-order filter 433, and the output is output. The signal Fout(3) will pass through the high-order filter 433; the fourth required frequency of the output signal Fout(4) falls within the frequency range established by the high-order filter 434, and the output signal Fout(4) will be filtered from the higher order. The passer 434 passes.
當直接數位合成電路30採用第一頻率之本地參考源LO1作為調變及混頻之震盪源時，將混頻產生第一需求頻率及第二需求頻率之輸出訊號Fout(1-2)且傳送至輸出訊號選擇電路40。輸出訊號選擇電路40可以根據於欲輸出第一需求頻率之輸出訊號Fout(1)或第二需求頻率之輸出訊號Fout(2)，相對選擇第一開關選擇器42及第二開關選擇器44切向高階濾波器431或432。例如：輸出訊號選擇電路40選擇輸出第一需求頻率之輸出訊號Fout(1)時，將會控制第一開關選擇器42及第二開關選擇器44切向高階濾波器431，第一需求頻率之輸出訊號Fout(1)將會通過高階濾波器431以從第二開關選擇器44進行輸出，而第二需求頻率之輸出訊號Fout(2)將會被高階濾波器431所濾除。When the direct digital synthesizing circuit 30 uses the local reference source LO 1 of the first frequency as the oscillating source of the modulated and mixed frequency, the output signal Fout(1-2) of the first required frequency and the second required frequency is generated by mixing and It is sent to the output signal selection circuit 40. The output signal selection circuit 40 can relatively select the first switch selector 42 and the second switch selector 44 according to the output signal Fout(1) for outputting the first required frequency or the output signal Fout(2) of the second required frequency. To the high order filter 431 or 432. For example, when the output signal selection circuit 40 selects and outputs the output signal Fout(1) of the first required frequency, the first switch selector 42 and the second switch selector 44 are controlled to the tangential high-order filter 431, and the first required frequency is The output signal Fout(1) will be output from the second switch selector 44 through the higher order filter 431, and the output signal Fout(2) of the second desired frequency will be filtered by the higher order filter 431.
或者，當直接數位合成電路30採用第二頻率之本地參考源LO2作為調變及混頻之震盪源時，將混頻產生第三需求頻率及第四需求頻率之輸出訊號Fout(3-4)且傳送至輸出訊號選擇電路40。輸出訊號選擇電路40可以根據於欲輸出第三需求頻率之輸出訊號Fout(3)或第四需求頻率之輸出訊號Fout(4)，相對選擇第一開關選擇器42及第二開關選擇器44切向高階濾波器433或434。例如：輸出訊號選擇電路40選擇輸出第四需求頻率之輸出訊號Fout(4)時，將會控制第一開關選擇器42及第二開關選擇器44切向高階濾波器434，第四需求頻率之輸出訊號Fout(4)將會通過高階濾波器434以從第二開關選擇器44進行輸出，而第三需求頻率之輸出訊號Fout(3)將會被高階濾波器434所濾除。Alternatively, when the direct digital synthesizing circuit 30 uses the local reference source LO 2 of the second frequency as the oscillating source of the modulation and mixing, the mixing produces the output signal Fout of the third required frequency and the fourth required frequency (3-4). And transmitted to the output signal selection circuit 40. The output signal selection circuit 40 can relatively select the first switch selector 42 and the second switch selector 44 according to the output signal Fout(3) for outputting the third required frequency or the output signal Fout(4) of the fourth required frequency. To the higher order filter 433 or 434. For example, when the output signal selection circuit 40 selects and outputs the output signal Fout(4) of the fourth required frequency, the first switch selector 42 and the second switch selector 44 are controlled to the tangential high-order filter 434, and the fourth demand frequency is The output signal Fout(4) will pass through the high order filter 434 for output from the second switch selector 44, and the output signal Fout(3) of the third desired frequency will be filtered by the higher order filter 434.
本發明訊號產生裝置200實際電路運作時，輸出訊號選擇電路40從直接數位合成電路30接收輸出訊號Fout(1-4)的當下，本地震盪源LO1/ LO2、類比訊號AN3/AN4或其他訊號源往往也會跟著輸出訊號Fout(1-4)傳送至輸出訊號選擇電路40。則，本發明高階濾波器431、432、433、434除了具有濾除非需求頻率之輸出訊號Fout之功效外，也能將本地參考源LO1/ LO2、類比訊號AN3/AN4或其他頻率訊號源一併濾除，以避免這些非需求訊號偽裝在真正需求頻率之輸出訊號Fout之中而影響到訊號產生裝置200的訊號輸出品質。When the actual signal operation of the signal generating apparatus 200 of the present invention, the output signal selecting circuit 40 receives the output signal Fout(1-4) from the direct digital synthesizing circuit 30, the present seismic source LO 1 / LO 2 and the analog signal AN 3 /AN 4 Or other signal sources are often transmitted to the output signal selection circuit 40 along with the output signal Fout(1-4). Then, the high-order filters 431, 432, 433, and 434 of the present invention can also have the local reference source LO 1 / LO 2 , the analog signal AN 3 /AN 4 or other frequencies in addition to the function of filtering the output signal Fout of the required frequency. The signal source is filtered together to prevent the non-demand signals from being spoofed in the output signal Fout of the true demand frequency, thereby affecting the signal output quality of the signal generating device 200.
再者，由於本發明係以本地參考源LO1/ LO2作為產生輸出訊號Fout(1-4)的主要震盪源，所以輸出訊號Fout(1-4)之頻率往往接近於本地參考源LO1/LO2之頻率，以致高階濾波器431、432、433、434往往無法有效地將本地參考源LO1/ LO2完全濾除。Furthermore, since the present invention uses the local reference source LO 1 / LO 2 as the main source of oscillation for generating the output signal Fout(1-4), the frequency of the output signal Fout(1-4) tends to be close to the local reference source LO 1 . The frequency of /LO 2 is such that the high order filters 431, 432, 433, 434 are often unable to effectively filter out the local reference source LO 1 / LO 2 completely.
接續，本發明一較佳實施例中，為了解決高階濾波器431、432、433、434無法有效地將本地參考源LO1/ LO2完全濾除之缺失，本發明輸出訊號選擇電路40亦可在第一開關選擇器42之前端處進一步設置一第三開關器411、一第一帶拒濾波器412、一第二帶拒濾波器413及一第四開關器414。第三開關器411之其中一端連接直接數位合成電路30之混頻器35以接收直接數位合成電路30所傳遞的訊號，而另一端選擇連接第一帶拒濾波器412之輸入或第二帶拒濾波器413之輸入。第四開關器414之其中一端選擇連接第一帶拒濾波器412之輸出或第二帶拒濾波器413之輸出，而另一端連接第一開關選擇器42。In the preferred embodiment of the present invention, in order to solve the problem that the high-order filters 431, 432, 433, and 434 cannot effectively filter out the local reference source LO 1 / LO 2 completely, the output signal selection circuit 40 of the present invention may also be used. A third switch 411, a first rejection filter 412, a second rejection filter 413 and a fourth switch 414 are further disposed at the front end of the first switch selector 42. One end of the third switch 411 is connected to the mixer 35 of the direct digital synthesizing circuit 30 to receive the signal transmitted by the direct digital synthesizing circuit 30, and the other end is connected to the input of the first rejecting filter 412 or the second reject. Input to filter 413. One end of the fourth switch 414 is selected to connect the output of the first rejection filter 412 or the output of the second rejection filter 413, and the other end is connected to the first switch selector 42.
當輸出訊號選擇電路40從直接數位合成電路30接收到第一需求頻率、第二需求頻率之輸出訊號Fout(1-2)及其震盪源(如第一頻率之本地參考源LO1)時，將控制第三開關器411及第四開關器414切向第一帶拒濾波器412，以利用第一帶拒濾波器412濾除掉第一頻率(如960MHz)之本地參考源LO1。或者，當輸出訊號選擇電路40從直接數位合成電路30接收到第三需求頻率、第四需求頻率之輸出訊號Fout(3-4)及其震盪源(如第二頻率之本地參考源LO2)時，將控制第三開關器411及第四開關器414切向第二帶拒濾波器413，以利用第二帶拒濾波器413濾除掉第二頻率(如840MHz)之本地參考源LO2。則，本發明輸出訊號選擇電路40即可利用第一帶拒濾波器412及第二帶拒濾波器412對於單頻的本地參考源LO1/LO2有效地進行濾除的動作。When the output signal selection circuit 40 receives the first required frequency, the second required frequency output signal Fout(1-2), and its oscillation source (such as the local reference source LO 1 of the first frequency) from the direct digital synthesis circuit 30, The third switch 411 and the fourth switch 414 are controlled to be tangential to the first rejection filter 412 to filter out the local reference source LO 1 of the first frequency (eg, 960 MHz) by the first rejection filter 412. Alternatively, when the output signal selection circuit 40 receives the third demand frequency, the fourth demand frequency output signal Fout (3-4) and its oscillation source (such as the local reference source LO 2 of the second frequency) from the direct digital synthesis circuit 30. The third switch 411 and the fourth switch 414 are controlled to be tangential to the second band rejection filter 413 to filter out the local reference source LO 2 of the second frequency (eg, 840 MHz) by using the second band rejection filter 413. . Then, the output signal selection circuit 40 of the present invention can effectively filter out the local reference source LO 1 /LO 2 of the single frequency by using the first rejection filter 412 and the second rejection filter 412.
本發明又一實施例中，為了得到一更高頻的輸出訊號Fout，於第二開關選擇器44之輸出端尚連接一第二頻率乘法器45。第二頻率乘法器45利用一第三倍率N3對於第二開關選擇器44所選擇輸出的第一需求頻率、第二需求頻率、第三需求頻率或該第四需求頻率之輸出訊號Fout進行昇頻，如此即可取得一操作頻率更高的輸出訊號Fout×N3。In another embodiment of the present invention, in order to obtain a higher frequency output signal Fout, a second frequency multiplier 45 is connected to the output of the second switch selector 44. The second frequency multiplier 45 uses a third magnification N 3 to increase the output signal Fout of the first required frequency, the second required frequency, the third required frequency, or the fourth required frequency selected by the second switch selector 44. Frequency, so that an output signal Fout × N 3 with a higher operating frequency can be obtained.
在此，本發明訊號產生裝置200藉由輸出訊號選擇電路40之設置，將可以有效地將非需求頻率之訊號完全濾除，致使以真正地輸出一符合實際需求頻率且具有低相位雜訊、低偽裝訊號特性的輸出訊號，而提升訊號產生裝置200的訊號輸出品質。Herein, the signal generating device 200 of the present invention can effectively filter out the signal of the non-demand frequency by the setting of the output signal selecting circuit 40, so as to truly output a frequency that meets the actual demand frequency and has low phase noise. The output signal of the signal feature is low, and the signal output quality of the signal generating device 200 is improved.
綜合上述，本發明訊號產生裝置200利用優化後之本地參考源LO1/LO2作為調變及混頻之主要震盪源，將可以產生一符合實際需求頻率且兼具低相位雜訊及低偽裝訊號特點的輸出訊號Fout。再者，本發明訊號產生裝置200採用直接數位合成電路30作為裝置的主要架構，其頻率切換速度將可以低於1.5 us以下，使得輸出訊號Fout之頻率可以快速地進行切換。此外，由於本發明訊號產生裝置200所具備的低相位雜訊及低偽裝訊號之性能優點，將適合作為雷達設備的連續波訊號(Frequency Modulated Continuous Wave；FMCW)之產生裝置。In summary, the signal generating apparatus 200 of the present invention utilizes the optimized local reference source LO 1 /LO 2 as the main oscillating source of modulation and mixing, and can generate a frequency that meets the actual demand frequency and has both low phase noise and low camouflage. The signal output of the signal is Fout. Furthermore, the signal generating apparatus 200 of the present invention uses the direct digital synthesizing circuit 30 as the main architecture of the apparatus, and the frequency switching speed thereof can be lower than 1.5 us, so that the frequency of the output signal Fout can be quickly switched. In addition, due to the performance advantages of the low phase noise and the low camouflage signal provided by the signal generating device 200 of the present invention, it will be suitable as a generating device for a frequency modulated continuous wave (FMCW) of a radar device.
以上所述者，僅為本發明之一較佳實施例而已，並非用來限定本發明實施之範圍，即凡依本發明申請專利範圍所述之形狀、構造、特徵及精神所為之均等變化與修飾，均應包括於本發明之申請專利範圍內。
The above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention, which is equivalent to the changes in shape, structure, features and spirit of the present invention. Modifications are intended to be included in the scope of the patent application of the present invention.
200．．．訊號產生裝置200. . . Signal generating device
20．．．參考源優化電路20. . . Reference source optimization circuit
30．．．直接數位合成電路30. . . Direct digital synthesis circuit
40．．．輸出訊號選擇電路40. . . Output signal selection circuit
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