九、發明說明： 【發明所屬之技術領域】 本發明係為一種可調式傳輸零點之低雜訊高增益 主動式濾波器，尤指具備可抑制干擾信號及可調式突 波信號抑制功能者，適用於無線通訊領域。 【先前技術】 如美國專利第6850747號之「鏡像抑止濾波器 (Image trap filter)」，一種鏡像抑止滤波器係置於一低 雜訊放大器與一無線電頻率接收器之混波器（The mixer of a radio frequency receiver)間，並具備可微調 之突波抑制機制，但使用了許多主、被動元件’此結 構將增加電路佈局複雜度並增加電路使用面積，且此 電路並未整合濾波器與信號放大器之功能。 另，如美國專利第6681103號之「On-chip image reject filter」，此篇專利係揭露以傳統之低雜訊放大器 整合成一鏡像去除濾波器（image reject filter)，並用於 超外差接收器（superheterodyne receiver)之前端，以及 美國專利第6873212號之「具有陷波濾波器之積體電 路無線電頻率放大器（INTEGRATED CIRCUIT RADIO FREQUENCY AMPLIFIER WITH NOTCH FILTER)」， 其為一種積體電路超外差無線電接收器係包含一具放 大器耦合之陷波濾波器，用以放大無線電頻率訊號。 1329984 但上述專利無法提供可調式傳輸零點，因此產業利用 性仍有許多待改進之空間。故，-般習用者係益法符 合使用者於實際使用時之所需。 … 【發明内容】 本發明之主要目的係在於，具備可抑制高頻或低 頻之干擾彳5號及可調式突波信號抑制功能，並達到可 φ 調式傳輸零點、可調式增益、提供低雜訊信號放大及 抗製程漂移等功效，且適用於單晶片系統整合。 為達上述之目的，本發明係一種可調式傳輸零點 之低雜訊咼增益主動式濾波器，本發明之主動式濾波 器係至少由一濾波模組、一增益放大模組、一可調式 匹配網路模組及一增益控制模組所構成。 【實施方式】 。月參閱第1圖』所示，係本發明實施例之電路 結構示意圖◊如圖所示：本發明係為一種可調式傳輸 零點之低雜訊咼增益主動式濾波器，本發明之主動式 遽波器1係至少由一濾波模組1 1、一增益放大模組 1 2、一可調式匹配網路模組1 3及一增益控制模組 1 4所構成。 上述之濾波模組1 1係包含一訊號輸入端1 1 1，其另一端係連接地電極，該濾波模組1 1係用以 6 . r*1 . 1329984 抑止低頻突波信號進入電路，避免造成電路飽合。 上述之增益放大模組1 2係至少包含一第一電晶 體1 2 1及一閘極電壓端1 2 2，並形成一共閘極放 大器’且與上述之濾波模組1 1連接，而該增益放大 模組1 2係用以將低雜訊信號放大，並可降低電路受 製程及溫度漂移所造成之影響，其中，該第一電晶體 1 2 1係選自場效應電晶體、雙極性接面電晶體及主 動元件中擇其一。 上述之可調式匹配網路模組i 3一端係與上述增 益放大模組1 2疊接，其另一端係與上述之增益控制 模組1 4疊接，然而該增益放大模組i 2及增益控制 模組1 4係皆為共閘極放大器，所以該可調式匹配網 路模組1 3係設於兩共閘極放大器間，並用以提高電 =之增益及降低電路之雜訊指數，另更可提供可調式 突波抑制之功能，其中該可調式匹配網路模組1 3可 由可調式電容與可調式電感所構成。 上述之增益控制模組1 4係為共閘極放大器，係 至少包含-第二電晶體i 4 i及—電壓控制端丄4 所以了於電壓控制端1 4 2輸入一電壓增壓電路 之操作動態範圍，而該第二電晶體1 4 1之-端係連 應電壓端15，而該第二電晶體141與供應 端15間設有-訊號輸出端16。如是，藉由上 述構成-全新之可調式傳輸零點之低雜訊高增益主動 s 1329984 式遽波器。 請參閱『第2及3圖』所示，係本發明之S參數 曲線圖及本發明之雜訊指數曲線圖。如圖所示：於第 2圖中係包含一第一增益曲線2 1、一 input return loss 曲線 2 2 及一 output return loss 曲線 2 3，當輸 入訊號於頻率15GHz至20GHz之間時，訊號會被放 大’當輸入訊號頻率不在上述範圍時，訊號會被抑止， 另由第3圖之第一雜訊指數曲線3 1，可知本發明之 雜訊指數特性。 請參閱『第4圖』所示’係本發明之可調增益範 圍曲線圖。如圖所示：包含一第二增益曲線4 1 ,當 於該增益控制模組之電壓控制端輸入電壓，隨電壓值 增加，本發明之操作動態範圍亦可增加。 請參閱『第5圖』所示，係本發明之串接兩級主 動式濾、波器之第一S參數與雜訊指數曲線圖。如圖所 示：包含一第三增益曲線5 1、一第四增益曲線5 2、 一第二雜訊曲線5 3及一第三雜訊曲線5 4，由此可 知，串接兩個單級主動式濾波器時，兩主動式濾波器 之傳輸零點係可設於同一頻率下，提供窄頻之效果。 請參閱『第6圖』所示，係本發明之串接兩級主 動式濾、波器之第一 S參數與雜訊指數曲線圖。如圖所 示··包含一第五增益曲線6 1、一第六增益曲線6 2、 一第四雜訊曲線6 3及一第五雜訊曲線6 4，由此可 1329984 知’串接兩個單級主動式遽波器時，兩主動式滤波器 之傳輸零點係可設於不同頻率下。 、综上所述，本發明可調式傳輸零點之低雜訊高增 益主動式濾波器可有效改善習用之種種缺點，且備可 抑制高頻或低頻之干㈣號及可調式突波信號抑制功 能，並達到可調式傳輸零點、可調式增益、提供低雜 訊信號放大及抗製程漂移’且適用於單晶片系統整 合’而整體電路架構簡單，使用元件較少，進而使本 發明之產生能更進步、更實用、更符合使用者之所須， 確已符合發明專财請之要件’表依法提出專利申請。 惟以上所述者，僅為本發明之較佳實施例而已， 當不能以此限定本發明實施之範圍；&，凡依本發明 申請專利範圍及發明說明書内容所作之簡單的等效變 化與修飾，皆應仍屬本發明專利涵蓋之範圍内。 1329984 【圖式簡單說明】 第1圖’係本發明實施例之電路結構示意圖。 第2圖’係本發明之s參數曲線圖。 第3圖’係本發明之雜訊指數曲線圖。 第4圖，係本發明之可調增益範圍曲線圖。 第5圖，係本發明之串接兩級主動式濾波器之第一 s 參數與雜訊指數曲線圖。 第6圖’係本發明之串接兩級主動式遽波器之第二s 參數與雜訊指數曲線圖。 【主要元件符號說明】 主動式濾波器1 濾波模組11 訊號輸入端111 增益放大模組12 第一電晶體1 2 1 閘極電壓端1 2 2 可調式匹配網路模組13 增益控制模組1 4 第二電晶體1 4 1 電壓控制端142 供應電壓端1 5 :s 1329984 訊號輸出端16 第一增益曲線21 input return loss 曲線 2 2 output return loss 曲線 2 3 第一雜訊指數曲線31 第二增益曲線41 第三增益曲線51 第四增益曲線5 2 第二雜訊指數曲線5 3 第三雜訊指數曲線5 4 第五增益曲線61 第六增益曲線6 2 第四雜訊指數曲線6 3 第五雜訊指數曲線6 4IX. Description of the invention: [Technical field of the invention] The present invention is a low-noise high-gain active filter with adjustable transmission zero point, especially for suppressing interference signals and adjustable surge signal suppression functions. In the field of wireless communications. [Prior Art] As shown in U.S. Patent No. 6,850,747, "Image trap filter", an image rejection filter is placed in a mixer of a low noise amplifier and a radio frequency receiver (The mixer of a radio frequency receiver) with a fine-tuning surge suppression mechanism, but using many active and passive components' This structure will increase the circuit layout complexity and increase the circuit use area, and this circuit does not integrate filters and signals. The function of the amplifier. In addition, as described in the "On-chip image reject filter" of U.S. Patent No. 6,681,103, this patent discloses the integration of a conventional low noise amplifier into an image reject filter and is used for a superheterodyne receiver ( Superheterodyne receiver), and "INTEGRATED CIRCUIT RADIO FREQUENCY AMPLIFIER WITH NOTCH FILTER", which is an integrated circuit superheterodyne radio receiver, and U.S. Patent No. 6,783,212, "INTEGRATED CIRCUIT RADIO FREQUENCY AMPLIFIER WITH NOTCH FILTER" A notch filter with an amplifier coupling is used to amplify the radio frequency signal. 1329984 However, the above patents cannot provide adjustable transmission zeros, so there is still much room for improvement in industrial utilization. Therefore, the general practitioners are in line with the user's needs in actual use. [Disclosure] The main object of the present invention is to provide a high-frequency or low-frequency interference 彳5 and an adjustable glitch signal suppression function, and to achieve φ-modulated transmission zero point, adjustable gain, and low noise. Signal amplification and resistance to process drift, and is suitable for single-chip system integration. In order to achieve the above purpose, the present invention is a low noise 咼 gain active filter with adjustable transmission zero point. The active filter of the present invention is at least a filter module, a gain amplification module, and an adjustable matching. The network module and a gain control module are formed. [Embodiment] Referring to FIG. 1 , a schematic diagram of a circuit structure of an embodiment of the present invention is shown in the drawing. The present invention is a low noise 咼 gain active filter with adjustable transmission zero point, and the active 遽 of the present invention. The wave filter 1 is composed of at least a filter module 1 1 , a gain amplifying module 1 2 , an adjustable matching network module 13 and a gain control module 14 . The filter module 1 1 includes a signal input terminal 1 1 , and the other end is connected to the ground electrode, and the filter module 1 1 is used for 6. r*1 . 1329984 to suppress the low frequency glitch signal from entering the circuit to avoid Causes the circuit to saturate. The gain amplifying module 1 2 includes at least a first transistor 1 2 1 and a gate voltage terminal 1 2 2, and forms a common gate amplifier 'and is connected to the filter module 11 described above, and the gain is The amplifying module 12 is used for amplifying the low noise signal and reducing the influence of the circuit and the temperature drift. The first transistor 1 2 1 is selected from the field effect transistor and the bipolar connection. Choose one of the surface transistor and the active component. One end of the adjustable matching network module i 3 is overlapped with the gain amplifying module 12, and the other end is overlapped with the gain control module 14 described above, but the gain amplifying module i 2 and the gain The control module 14 is a common gate amplifier, so the adjustable matching network module 13 is disposed between the two common gate amplifiers, and is used to increase the power of the power and reduce the noise index of the circuit. The function of adjustable surge suppression is further provided, wherein the adjustable matching network module 13 can be composed of a tunable capacitor and a tunable inductor. The gain control module 14 is a common gate amplifier, and includes at least a second transistor i 4 i and a voltage control terminal 所以4, so that the voltage control terminal 14 4 inputs a voltage boost circuit operation. The dynamic range, and the end of the second transistor 141 is connected to the voltage terminal 15, and the signal output terminal 16 is disposed between the second transistor 141 and the supply terminal 15. If so, by the above-mentioned composition - the new low-noise high-gain active s 1329984 chopper with adjustable transmission zero. Please refer to the "parameters 2 and 3" for the S-parameter graph of the present invention and the noise index graph of the present invention. As shown in the figure: in Fig. 2, a first gain curve 2 1 , an input return loss curve 2 2 and an output return loss curve 2 3 are included. When the input signal is between 15 GHz and 20 GHz, the signal will be Amplified 'When the input signal frequency is out of the above range, the signal is suppressed. The first noise index curve 3 1 of Fig. 3 shows the noise index characteristic of the present invention. Please refer to the diagram of the adjustable gain range of the present invention as shown in Fig. 4. As shown in the figure, the second gain curve 4 1 is included. When the voltage is input to the voltage control terminal of the gain control module, the operating dynamic range of the present invention may also increase as the voltage value increases. Please refer to FIG. 5, which is a graph of the first S-parameter and the noise index of the serial two-stage active filter and wave device of the present invention. As shown in the figure, a third gain curve 5 1 , a fourth gain curve 5 2 , a second noise curve 5 3 and a third noise curve 5 4 are included, so that two single stages are connected in series. In the case of an active filter, the transmission zeros of the two active filters can be set at the same frequency to provide a narrow frequency effect. Please refer to FIG. 6 , which is a graph of the first S parameter and the noise index of the serial two-stage active filter and wave device of the present invention. As shown in the figure, a fifth gain curve 6 1 , a sixth gain curve 6 2 , a fourth noise curve 6 3 and a fifth noise curve 6 4 are included, thereby being able to know that 'the two are connected in series. In the case of a single-stage active chopper, the transmission zeros of the two active filters can be set at different frequencies. In summary, the low noise high gain active filter of the adjustable transmission zero point of the invention can effectively improve various shortcomings of the conventional use, and can suppress the high frequency or low frequency dry (four) number and the adjustable surge signal suppression function. And achieve adjustable transmission zero, adjustable gain, provide low noise signal amplification and resistance to process drift 'and is suitable for single-chip system integration' and the overall circuit structure is simple, using fewer components, so that the production of the invention can be more Progressive, more practical, and more in line with the needs of users, it has indeed met the requirements of the invention of special funds, the form of the patent application. However, the above is only the preferred embodiment of the present invention, and the scope of the present invention is not limited thereto; & Modifications are still within the scope of the invention. 1329984 BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a schematic view showing the circuit structure of an embodiment of the present invention. Fig. 2 is a graph of the s parameter of the present invention. Figure 3 is a graph of the noise index of the present invention. Figure 4 is a graph of the adjustable gain range of the present invention. Figure 5 is a graph showing the first s-parameter and noise index of the cascaded two-stage active filter of the present invention. Figure 6 is a second s-parameter and noise index graph of the cascaded two-stage active chopper of the present invention. [Main component symbol description] Active filter 1 Filter module 11 Signal input terminal 111 Gain amplification module 12 First transistor 1 2 1 Gate voltage terminal 1 2 2 Adjustable matching network module 13 Gain control module 1 4 Second transistor 1 4 1 Voltage control terminal 142 Supply voltage terminal 1 5 : s 1329984 Signal output terminal 16 First gain curve 21 input return loss Curve 2 2 output return loss Curve 2 3 First noise index curve 31 Second gain curve 41 Third gain curve 51 Fourth gain curve 5 2 Second noise index curve 5 3 Third noise index curve 5 4 Fifth gain curve 61 Sixth gain curve 6 2 Fourth noise index curve 6 3 Fifth noise index curve 6 4