九、發明說明： 【發明所屬之技術領域】 本發明是有關於一種電視調It器（Television Tuner)， 且特別是有關於一種製作於單晶（single substrate )上的高 整合電視調諧器。 【先前技術】 一般來說’非常南頻（Very High Frequency，簡稱VHF ) 與超高頻（Ultra high Frequency，簡稱 UHF )的射頻（Radio Frequency’簡稱RF)電視信號的頻譜（Spectrurn)位於 48MHz至860MHz之間。而在48MHz至860MHz之間的 頻谱包含有複數個頻道（channei )，每個頻道的頻寬 (Bandwidth)為6MHz (或8MHz)，距離低頻率邊緣高 1.25MHz的頻率為影像載波頻率（vide〇 Carrier Frequency) ’距離影像載波頻率高3 58MHz的頻率為顏色 載波頻率（Color Carrier Frequency)，距離影像載波頻率高 4.5MHZ的頻率為聲音載波頻率（Audio Carrier Frequency)。舉例來說，第二頻道的61^^頻寬是由 至6〇MHz ’而影像載波頻率為55.25MHz，顏色载波頻率 為58.83MHz，而聲音載波頻率為59 75MHz。 j的射較視錢可㈣天線或者電财傳遞至電 視調諧器，而電視調絲可選㈣定的—個或者數個頻道 1373970 並轉換成為一中頻（Intermediate Frequency，簡稱ip)传 號或者基頻（Baseband Frequency)信號後，傳送至處理器 (Processor)進行後續中頻信號或者基頻信號的處理。 早期的電視調諧器為單一下轉（SingleIX. INSTRUCTIONS: 1. Field of the Invention The present invention relates to a television tuner, and more particularly to a highly integrated television tuner fabricated on a single substrate. [Prior Art] Generally, the spectrum of the radio frequency (Radio Frequency' RF) TV signal of Very High Frequency (VHF) and Ultra High Frequency (UHF) is located at 48MHz to Between 860MHz. The spectrum between 48MHz and 860MHz contains a plurality of channels (channei), the bandwidth of each channel is 6MHz (or 8MHz), and the frequency higher than 1.25MHz from the low frequency edge is the image carrier frequency (vide 〇Carrier Frequency) 'The frequency of the image carrier frequency is 3 58MHz is the color carrier frequency (Color Carrier Frequency), and the frequency higher than the image carrier frequency is 4.5MHZ is the audio carrier frequency (Audio Carrier Frequency). For example, the 61^^ bandwidth of the second channel is from 6 〇 MHz ′ while the image carrier frequency is 55.25 MHz, the color carrier frequency is 58.83 MHz, and the sound carrier frequency is 59 75 MHz. The shot of j can be compared to the money (4) antenna or electricity is transmitted to the TV tuner, and the TV tunes can be selected (4) one or several channels 1373970 and converted into an intermediate frequency (ip) or After the baseband frequency signal is transmitted to the processor for processing the subsequent intermediate frequency signal or the baseband signal. Early TV tuner for single down (Single
Down-Conversion)調諧器，此調諧器是由多個獨立的電子 元件所組合而成所以體積龐大，又可稱之為金屬殼調諧器 (CAN Tuner )。單一下轉調諧器中包括一混頻器 (Mixer) ’混頻器主要將射頻電視信號直接下轉成為中頻 信號或者基頻信號。請參照第一圖，其所繪示為單一下轉 調諧器的頻率轉換示意圖。射頻電視信號(1)中包括複數個 頻道，經由混頻器乘上一參考頻率（fL〇)的參考信號(π) 後，射頻電視信號中位於參考頻率（fL〇)的頻道A會被下 轉至基頻。 以切換式混頻器（Switching Mixer)為例，參考信號 實際上是責任週期5〇%的方波（Square Wave)，也就是說， 多考U虎中έ包括峰多言皆振頻率（Harmonic Frequency )， 例如3fL0、5fL0、7fL〇等等的諧振頻率。因此，如圖所示 射頻電視信號中裁波為3倍參考頻率（3fL〇)的頻道B、 載波為5倍參考頻率（5fL〇)的頻道c、載波為7倍參考 頻率（7fL0)的頻道D，皆會被下轉至基頻。因此，至少 同日t有頻道A、B、C、D的信號會出現於基頻，如信號(m) 戶斤示。 假设射頻電視信號中頻道B、C、D的能量強度（Power) 比頻道A的強度高出30dB，為了要降低由諧振頻率所導 7 1373970 致的信號訊雜比損壞（SNR degradation)，並使得頻道B、 C、D於基頻的強度要小於頻道A的強度3〇dB，因此，必 須提供一谐振拒斥比（Harmonic Rejecti〇n Rati〇 )高於6〇犯 的元件。 ，因此’習知單-下轉觸器中會預先利用多個射頻追 蹤遽波器（RF Tracking Filter )於射頻電視信號進入混頻器 之前先降低射頻電視信號中諧振頻道的強度，並解決混^ 益於基頻產生的諧振問題。然而，射頻追蹤濾波器的體積 龐大並且需要由高電壓來進行頻帶的調整，因此成本相對 的提鬲，並且不利於整合於單晶的積體電路之中。 由於半導體矽晶片的製程技術日益進步，為了要有效 的降低電視調諧器的成本，整合於單晶的電視調諧器已經 被開發出來，例如美國專利US5,737,035所揭露整合於單 日日的上下雙轉（Up-Down Dual Conversion )的電視調譜器。 請參照第二圖，其所繪示為習知上下雙轉調諧器示意 圖。由天線402 (或者電纜線）所接收的射頻電視信號先 經過截止頻率（CutoffFrequency)為900MHz的射頻低通 濾波器（RF Low Pass Filter，RFLPF) 404，使得濾波後的 射頻電視信號的頻帶被限制在900MHz以下。接著，遽波 後的射頻電視信號被一低雜訊轉導放大器（L〇w N〇iseDown-Conversion) A tuner that is a combination of multiple independent electronic components and is so bulky that it can be called a CAN Tuner. The single-turn tuner includes a mixer (Mixer). The mixer mainly converts the RF TV signal directly into an intermediate frequency signal or a baseband signal. Please refer to the first figure, which is a schematic diagram of frequency conversion of a single down-converter. The radio frequency television signal (1) includes a plurality of channels, and after the reference signal (π) of a reference frequency (fL〇) is multiplied by the mixer, the channel A of the radio frequency television signal located at the reference frequency (fL〇) is Go to the baseband. Taking the Switching Mixer as an example, the reference signal is actually a square wave with a duty cycle of 5〇%. That is to say, the multi-test U-huzhong includes the peak-to-peak frequency (Harmonic). Frequency ), for example, the resonant frequency of 3fL0, 5fL0, 7fL〇, and the like. Therefore, as shown in the figure, the RF TV signal is cut into a channel B with a reference frequency of 3 times (3fL〇), a channel c with a carrier frequency of 5 times the reference frequency (5fL〇), and a channel with a carrier frequency of 7 times the reference frequency (7fL0). D, will be transferred to the baseband. Therefore, at least the same day t channels A, B, C, D signals will appear in the fundamental frequency, such as the signal (m). Assume that the energy intensity (Power) of channels B, C, and D in the RF TV signal is 30 dB higher than that of channel A, in order to reduce the signal SNR degradation caused by the resonant frequency. The strength of the channel B, C, and D at the fundamental frequency is less than the strength of the channel A by 3 〇 dB. Therefore, it is necessary to provide a component with a resonance rejection ratio (Harmonic Rejecti 〇 n Rati 〇) higher than 6 。. Therefore, the 'single-down-turner will pre-use multiple RF tracking filters to reduce the intensity of the resonant channel in the RF TV signal before the RF TV signal enters the mixer, and solve the problem. ^ Benefit from the resonance problem generated by the fundamental frequency. However, the RF tracking filter is bulky and requires adjustment of the frequency band by a high voltage, so the cost is relatively high and it is not conducive to integration into a single crystal integrated circuit. In order to effectively reduce the cost of a television tuner, in order to effectively reduce the cost of a television tuner, a television tuner integrated with a single crystal has been developed, for example, as disclosed in US Patent No. 5,737,035, which is integrated in a single day. Turn-up (D-Down Dual Conversion) TV tuner. Please refer to the second figure, which is shown as a schematic diagram of a conventional up-and-down double-turn tuner. The radio frequency television signal received by the antenna 402 (or the cable line) first passes through a RF low pass filter (RFLP) 404 with a Cutoff Frequency of 900 MHz, so that the frequency band of the filtered RF television signal is limited. Below 900MHz. Then, the post-chopper RF TV signal is a low noise transconductance amplifier (L〇w N〇ise
Transconductance Amplifier，簡稱 LNTA) 406 放大 20dB。 再者’本地震盪器（Local Oscillator) 411輸出一第一參考 信號其可調頻率範圍介於1200MHz與2100MHz之間。而 第&頻器（MIX1) 408 ’為一減法的混頻器（Subtractive 8Transconductance Amplifier (LNTA) 406 Amplifies 20dB. Further, the Local Oscillator 411 outputs a first reference signal whose adjustable frequency range is between 1200 MHz and 2100 MHz. And the &amperer (MIX1) 408 ' is a subtractive mixer (Subtractive 8)
Mixer)，其可以混合低雜訊轉導放A|| (lnta)槪的輸 出L 5虎與該第-參考k號而輸出—第—中頻信號，使得第 一中頻信號包括載波解為丨2_Hz的特定頻道( Charmd)。也就是說，調整第一參考信縣頻率，可 將特定頻道的載波轉換為Uoqmjjz。 由於第二本地震盪器412可輸出一第二參考信號其頻 率為1180MHz。而第二混頻器（助)41〇，為一鏡像拒 斥的混頻1 (Image-Rejeeti()n Mixe小其可以混合第二參 考信號與第—中齡號而輸出—第二中齡號，使得第二 中頻信號包括載波頻率為20MHz的特定頻道。也就是說， 此特定頻道的載波經由第二混頻器（ΜΙχ2) 41〇轉換為 20MHz 4知上下雙轉調譜器的第一混頻器（MIX1 ) 408 用以將該特定頻道的載波頻率上轉至1200MHz而第二混 頻器（MIX2) 410用以將該特定頻道的載波頻率下轉至 20MHz。再者’由於本地震盪器411輸出的一第一參考信 號的頻率調整範圍在1200MHz與2100MHz之間，因此本 地震盪器411必須利用多個壓控震盪器（Voltage Controlled Oscillator，VCO)才可實現。 3月參照第二圖，其所繪示為習知另一上下雙轉調譜器 不意圖。為了防止116〇MHz頻率的鏡像（Image)，一第一 中頻濾波器（First IF Filter)409連接於第一混頻器（MIX1 ) 408與第二混頻器（MIX2) 410之間，用以將第一中頻信 號中的1160MHz的頻率成分移除。 由上述内容可知，習知上下雙轉調諳器皆是利用可調 1373970 整第一參考信號頻率的本地震盪器411以及固定的第二參 考信號頻率的第二本地震盪器412來達成。而提出另一種 不同架構的調諧器則為本發明最主要的目的。 【發明内容】 本發明的目的係提出一種不同架構的調諧器，並且易 於整合至單晶。 因此，本發明提出一種電視調諧器，包括：一接收端， 用以接收射頻信號；一低通濾波器，用以由射頻信號中區 分出第一頻段信號；一高通濾波器，用以由射頻信號中區 分出第二頻段信號；一本地震盪器，用以產生可調頻率的 參考信號組；一諧振拒斥與正交混頻器，用以根據參考信 號組混頻第一頻段信號以產生第一同相信號與第一正交信 號，其中，第一同相信號與第一正交信號中已經消除複數 個諧振頻率；一正交混頻器，用以根據該參考信號組混頻 該第二頻段信號以產生第二同相信號與第二正交信號；以 及，一數位處理電路，耦接至該諧振拒斥與正交混頻器以 及該正交混頻器，用以產生合成視訊廣播信號與聲音中頻 信號或者用以產生中頻信號輸出。 為了使貴審查委員能更進一步瞭解本發明特徵及技 術内容，請參閱以下有關本發明之詳細說明與附圖，然而 所附圖式僅提供參考與說明，並非用來對本發明加以限制。 10 1373970 【實施方式】 凊參照第四圖，其所繪示為本發明單一下轉（Single Down Conversion)的電視調諧器的第一實施例。由天線602 (或者電覺線）所接收的射頻電視信號經過一低雜訊放大 器（Low Noise Amplifier) 604放大後輸入一第一可變增益 放大器（Variable Gain Amplifier) 605以及一低通濾波器 606後產生第一頻段信號；以及，輸入一第二可變增益放 大器607以及一高通濾波器608後產生第二頻段信號。 根據本發明的第一實施例，經由不同的信號傳遞路徑 使得射頻電視信號可以初步區分為第一頻段信號或者第二 頻段彳5號。舉例來s兒，第一頻段信號的頻率範圍在 48MHz-450MHZ之間，而第二頻段信號的頻率範圍在 450MHz-860MHz之間。也就是說，當特定頻道⑺咖如 Channel)位於苐一頻段信號中，本發明的電視調諧器即可 以選擇該第一頻段信號來作後續的處理；反之，當特定頻 道位於第二頻段信號中，本發明的電視調諧器即可以選擇 該第二頻段信號來作後續的處理。 ' 假設特定頻道位於第-頻段信號時，第一頻段传號必 須經過-絲拒斥與正交混_⑽直接將雜定頻道°降 轉至基頻並且產生-同相信號（in_phase如㈣）j與一正 交信號（quadrature-phase signal) Q〇 由於第-頻段信號是屬於射頻電視信號中頻率較低的 部分，因此，由本地震盡器62〇所提供頻率為&的—組參 11 1373970 考信號經由譜振拒斥與正交混頻器610進行混頻第一頻段 信號之後，會產生高階（3ί»0、5ί〇、7ί〇...)的 階的譜振if號的頻率有可能在射頻電視信'號“頻 帶，圍，因此，必須提供譜振拒斥與正交現頻器⑽來消 除高階的諧振頻率。再者，為了要消除鏡像頻率，因此， 譜振拒斥與正交混頻器610也可以產生同相信號τ與正交 域(3並_後續触處理f路來將鏡_率消除。 时根據本發明之實施例，本地震盪器⑽包括—壓控震 盪器組622與一處理電路62卜處理電路621可以為二多Mixer), which can mix the output of the low noise transconductance A||(lnta)槪, the L5 tiger, and the first-reference k number, and output the first-intermediate frequency signal, so that the first intermediate frequency signal includes the carrier solution丨2_Hz specific channel (Charmd). That is to say, by adjusting the first reference letter frequency, the carrier of the specific channel can be converted into Uoqmjjz. Since the second oscillator 412 can output a second reference signal, the frequency is 1180 MHz. The second mixer (Help) 41〇, is a mirror-rejected mixing 1 (Image-Rejeeti() n Mixe small, which can mix the second reference signal with the first-age number and output - the second middle age No., so that the second intermediate frequency signal includes a specific channel with a carrier frequency of 20 MHz. That is, the carrier of the specific channel is converted to 20 MHz by the second mixer (ΜΙχ2) 41〇, and the first of the upper and lower double-conversion meters is known. The mixer (MIX1) 408 is used to up-convert the carrier frequency of the specific channel to 1200 MHz and the second mixer (MIX2) 410 is used to down-convert the carrier frequency of the specific channel to 20 MHz. The frequency adjustment range of a first reference signal output by the device 411 is between 1200 MHz and 2100 MHz, so the present oscillator 411 must be implemented by using a plurality of Voltage Controlled Oscillator (VCO). It is shown as another conventional double-twisted spectrometer. In order to prevent the image of the 116〇MHz frequency, a first IF filter 409 is connected to the first mixer. (MIX1) 408 and second mixer (MIX2) Between 410, the frequency component of 1160 MHz in the first intermediate frequency signal is removed. It can be seen from the above that the conventional upper and lower double-tuning tuners are all using the first reference signal frequency of the adjustable 1373970. 411 and a second second oscillator 412 having a fixed second reference signal frequency is achieved. Another tuner of a different architecture is proposed as the primary object of the present invention. SUMMARY OF THE INVENTION The object of the present invention is to propose a different architecture. The tuner is easy to integrate into a single crystal. Therefore, the present invention provides a television tuner comprising: a receiving end for receiving a radio frequency signal; and a low pass filter for distinguishing the first frequency band from the radio frequency signal a high-pass filter for distinguishing a second frequency band signal from the radio frequency signal; an oscillator for generating a reference signal group of adjustable frequency; a resonance rejection and a quadrature mixer for The reference signal group mixes the first frequency band signal to generate a first in-phase signal and a first quadrature signal, wherein the first in-phase signal and the first quadrature signal have been eliminated a plurality of resonant frequencies; a quadrature mixer for mixing the second frequency band signal according to the reference signal group to generate a second in-phase signal and a second quadrature signal; and a digital processing circuit coupled to The resonant rejection and quadrature mixer and the quadrature mixer are used to generate a composite video broadcast signal and a sound intermediate frequency signal or to generate an intermediate frequency signal output. To enable the reviewing committee to further understand the present invention. The features and technical details of the present invention are described in the following detailed description of the invention and the accompanying drawings. 10 1373970 [Embodiment] Referring to the fourth figure, a first embodiment of a single down conversion television tuner of the present invention is illustrated. The RF television signal received by the antenna 602 (or the electrical line) is amplified by a Low Noise Amplifier 604 and then input to a first variable gain amplifier (605) and a low pass filter 606. The first frequency band signal is generated; and a second frequency band signal is generated after inputting a second variable gain amplifier 607 and a high pass filter 608. According to the first embodiment of the present invention, the radio frequency television signal can be initially distinguished into the first frequency band signal or the second frequency band 彳5 number via different signal transmission paths. For example, the frequency range of the first frequency band signal is between 48 MHz and 450 MHz, and the frequency range of the second frequency band signal is between 450 MHz and 860 MHz. That is to say, when a specific channel (7) is located in the first frequency band signal, the television tuner of the present invention can select the first frequency band signal for subsequent processing; otherwise, when the specific channel is located in the second frequency band signal. The television tuner of the present invention can select the second frequency band signal for subsequent processing. 'Assuming the specific channel is in the first-band signal, the first-band signal must pass the -wire rejection and quadrature mixing_(10) to directly reduce the miscellaneous channel ° to the fundamental frequency and generate an in-phase signal (in_phase as in (4)) j and a quadrature-phase signal Q〇 Since the first-band signal belongs to the lower frequency part of the radio-frequency television signal, the frequency of the earthquake-supplied device 62 is set to & 1373970 After the sample signal is mixed with the quadrature mixer 610 by the spectral rejection and the quadrature mixer 610, the frequency of the high-order (3ί»0, 5ί〇, 7ί〇...) spectral if number is generated. It is possible to have a band in the RF telecommunication 'number', so it is necessary to provide spectral rejection and quadrature frequency (10) to eliminate high-order resonant frequencies. Furthermore, in order to eliminate the image frequency, spectral rejection is therefore required. The quadrature mixer 610 can also generate the in-phase signal τ and the orthogonal domain (3 and subsequent touch processing f to eliminate the mirror rate.) According to an embodiment of the invention, the present oscillator (10) includes - voltage control The oscillator group 622 and a processing circuit 62 processing circuit 621 can More than two
。堡控震盈器組622產生可調整頻率的震I 頻’處理電路621將該震m信號進行整數4的除 Y。亚生五個頻率相同相位分別為〇。、叩。、必。、 ^°'刚。的參考信號組；利用參考錢組的相位 1動19〇°的參考信號’可以進行同相信號T的譜振拒 差為90。、135。、18〇。的參考信號， 仃正又t號Q的諧振拒斥動作。 再者’假設特定頻道位於第 信號必須經過-正交混_ (加/員^翁，弟一頻段 將該特定頻道降轉至基頻==dra=MlXer)612直接 信號Q。 I且產生—同相信號I與-正交 由於第二頻段信號是屬 部分，因此，由本物ί62=視謝頻率較高的 號組經由正交混頻器612 ^供頻率為f〇的參考信 產生高階頻段信號之後，會 ^的5白振6號，而高階的諧振信 12 1373970 號的頻率已經超出射頻電視信號中的頻帶範圍，因此’並 不需要進行諧振拒斥動作來消除高階的諧振頻率，由正交 混頻器612產生同相信號I與正交信號Q即可。較佳地， 本地震盪器620提供相位差為〇。、90。的參考信號至正交 混頻器612，即可產生同相信號I與正交信號Q。 當同相信號I與正交信號Q產生之後，同相信號I可 經過第一低通濾波器623、第三可變增益放大器624後輸 入第一類比數位轉換器（ADC) 626後產生一數位同相信 號Γ ;同理’正交信號Q可經過第二低通濾波器632、第 四可變增益放大器634後輸入第二類比數位轉換器636後 產生一數位正交信號Qi。 數位鏡像消除電路（Digital Image Cancellation Circuit) 640用以接收數位同相信號Γ與數位正交信號Q，，藉由數 位處理消除數位同相信號Γ與數位正交信號Q，中的鏡像頻 率。數位解調器（Digital Demodulator) 650接收數位鏡像 消除電路640輸出的鏡像頻率消除後的數位同相信號j，與 數位正父信號Q’ ’並解調出數位的一合成視訊廣播信號 (Composite Video Broadcast Signal，簡稱 CVBS )，並經由 :=一數位類比轉換器652轉換成為類比的一合成視訊廣 播仏號（CVBS)後提供給一類比電視。再者，數位解調器 650接收數位鏡像消除電路_輸出的數位同相信號】，與數 位正，信號’並解調出-數位的聲音中頻信號 IF簡稱SIF)，並經由-第二數位類比轉換器654轉換成 為類比的聲音中頻（SIF)信號後提供給類比電視。、 13 =參照第五圖，其所緣示為本發明單一下轉的電視調 咕=的苐二實施例。與第一實施例的差別在於第二實施例 的电视調諧器係使用於數位電視（digitalTV)系统。因此， 數位解調器650接收數位鏡像消除電路64〇輪出的數位同 相信號I·與數位正交信號q，之後會輸出一數位的中頻二 號，經由第三數位類比轉換器656產生一類比中頻信號 jlF)提供給數位電視系統，或者，本發明亦可以利用二 單轉差电路（Single to differential converter)將第五圖中單 端（SignalEnded)的類比中頻信號（IF)轉換為差動的二 頻信號IF+、IF-給數位電視系統。 綜上所述，本發明提出一種電視調諧器，包括：一接 收端，用以接收—射頻信號；-低通遽波器，用以由射頻 信號中區分出第—頻段信號；-高通濾、波器，用以由射頻 信號中區分出第二頻段信號；—本地震盈器，用以產生可 調頻率的參考錢組；—能拒斥與正交混頻器，用以根 據參考信號減頻第—驗㈣以產生第—同 :正交信號，其中,第一同相信號與第一正交信= 消除複數個諧振頻率；正交混頻器，用以根據參考信號組 /昆頻第二頻段信號以產生第二同相信號與第二正交信號； 以及，一數位處理電路，耦接至該諧振拒斥與正交混頻°器 以及5亥正父混頻器，用以產生合成視訊廣播信號與聲音中 頻信號或者用以產生中頻信號輸出。舉例而言，數位處理 電路包含第-數位電路與第二數位電路，第一數位電^可 接收第-同相信號與第一正交信號或者第二同相信號與第 14 1373970 中頻信號。 因此，本發明的優點在於利用一單一 :使得本發明的本地震⑼中僅需—個壓控震盤=調: 幅度的簡化電視調譜器的設計且更容易整合於 早一晶片中。 盆、，駐所述，雖然本翻已以較佳實施例揭露如上，然 ^限定本發明，任何熟習此技藝者，在不脫離本 之保㈣圍富視後附之申請專利範圍所界定者為準。 【圖式簡單說明】 俾得一更深入之了解： ί案得藉由下列圖式及詳細說明， 第-不為早—下轉調譜器的頻率轉換示意圖。 C、%示為習知上下雙轉調諧器示意圖。 弟二圖所繪示為習知另— 第四下雙轉觸器示意圖。 例。 早下軲的電視調諧器的第一實施 視調諧器的第二實施 ^五圖所綠示為本發明單—下轉的動 【主要元件符號說明】 15 1373970 本案圖式中所包含之各元件列示如下：. The fly-controlled oscillator group 622 generates an adjustable frequency seismic I-frequency processing circuit 621 which divides the seismic m-signal by an integer of four. The sub-five frequencies of the same frequency are respectively 〇. ,knock. ,must. , ^°' just. The reference signal group; the reference signal of the reference money group 1 moving 19 〇 reference signal ' can make the spectral rejection of the in-phase signal T to be 90. , 135. 18〇. The reference signal, the resonance rejection action of the positive and t-number Q. Furthermore, it is assumed that the specific channel is located in the first signal and must be subjected to - orthogonal mixing _ (additional / _ _ ^, the frequency band is reduced to the fundamental frequency == dra = MlXer) 612 direct signal Q. I and generate - the in-phase signal I and - orthogonal because the second-band signal is a part of the genus, therefore, the reference number of the object ί62=higher frequency is via the quadrature mixer 612^ for the reference of the frequency f〇 After the signal is generated in the high-order band signal, the 5 white vibration number 6 will be ^, and the frequency of the high-order resonance signal 12 1373970 has exceeded the frequency band range in the radio frequency television signal, so 'the resonance rejection action is not required to eliminate the high-order The resonant frequency is generated by the quadrature mixer 612 to generate the in-phase signal I and the quadrature signal Q. Preferably, the present oscillator 620 provides a phase difference of 〇. 90. The reference signal to quadrature mixer 612 produces an in-phase signal I and a quadrature signal Q. After the in-phase signal I and the quadrature signal Q are generated, the in-phase signal I can pass through the first low-pass filter 623, the third variable gain amplifier 624, and then input to the first analog-to-digital converter (ADC) 626 to generate a digit. The in-phase signal Γ; the same as the 'quadrature signal Q' can pass through the second low-pass filter 632, the fourth variable gain amplifier 634 and then input to the second analog-bit converter 636 to generate a digital quadrature signal Qi. The Digital Image Cancellation Circuit 640 is configured to receive the digital in-phase signal 数 and the digital quadrature signal Q, and to eliminate the image frequency in the digital in-phase signal 数 and the digital quadrature signal Q by digital processing. The digital demodulator 650 receives the digital in-phase signal j after the image frequency cancellation by the digital image canceling circuit 640, and demodulates the digital composite video signal by the digital positive parent signal Q'' (Composite Video) Broadcast Signal (CVBS) is converted to an analog TV by converting the analog video broadcast nickname (CVBS) into an analogy. Furthermore, the digital demodulator 650 receives the digital in-phase signal outputted by the digital image cancellation circuit _, and the digital positive, the signal 'and demodulates the digital intermediate frequency signal IF (SIF), and the second digit The analog converter 654 converts to an analog sound intermediate frequency (SIF) signal and provides it to an analog television. 13 = Refer to the fifth figure, which is shown as a second embodiment of the single-down TV adjustment of the present invention. The difference from the first embodiment is that the television tuner of the second embodiment is used in a digital television system. Therefore, the digital demodulator 650 receives the digital in-phase signal I· and the digital quadrature signal q which are rotated by the digital image cancellation circuit 64, and then outputs a digital intermediate frequency number 2, which is generated by the third digital analog converter 656. A type of intermediate frequency signal jlF) is provided to the digital television system, or the invention can also convert the single-ended (SignalEnded) analog intermediate frequency signal (IF) in the fifth figure by using a single to differential converter. For the differential two-frequency signals IF+, IF- to the digital TV system. In summary, the present invention provides a television tuner comprising: a receiving end for receiving a radio frequency signal; and a low pass chopper for distinguishing a first band signal from the radio frequency signal; - high pass filtering, The wave device is used to distinguish the second frequency band signal from the radio frequency signal; the present seismic device is used to generate the reference money group with adjustable frequency; the repellent and quadrature mixer can be used to reduce according to the reference signal Frequency-test (4) to generate a first-to-same: quadrature signal, wherein the first in-phase signal and the first orthogonal signal = eliminate a plurality of resonant frequencies; the quadrature mixer is configured to use the reference signal group/Kun frequency a second frequency band signal to generate a second in-phase signal and a second quadrature signal; and a digital processing circuit coupled to the resonant rejection and quadrature mixing device and the 5H positive-family mixer for Generating a composite video broadcast signal and a sound intermediate frequency signal or for generating an intermediate frequency signal output. For example, the digital processing circuit includes a first-digit circuit and a second digital circuit, and the first digital device can receive the first-in-phase signal and the first quadrature signal or the second in-phase signal and the 14 13373970 intermediate frequency signal. Therefore, the present invention has the advantage of utilizing a single: such that the present invention (9) requires only a voltage-controlled disc = modulation: the amplitude of the simplified television spectrometer is designed and more easily integrated into the early wafer. The present invention has been described above with reference to the preferred embodiments, and the present invention is defined by those skilled in the art without departing from the scope of the appended claims. Prevail. [Simple description of the diagram] A more in-depth understanding: ί The case can be explained by the following diagram and detailed description, the frequency conversion diagram of the first-next-to-down-shifting spectrometer. C and % are shown as schematic diagrams of conventional upper and lower double-turn tuner. The second figure is shown as a schematic diagram of the fourth lower double-actuator. example. The first implementation of the TV tuner of the early 视 视 第二 第二 的 的 调谐 调谐 调谐 调谐 调谐 调谐 调谐 调谐 调谐 调谐 调谐 调谐 调谐 调谐 调谐 调谐 单 单 15 15 15 15 15 15 15 15 15 15 15 15 15 15 15 15 15 15 1 1 1 Listed as follows:
402天線 406低雜訊轉導放大器 409第一中頻濾波器 411本地震盈器 602天線 605第一可變增益放大器 607第二可變增益放大器 610諧振拒斥與正交混頻器 620本地震堡器 622壓控震盪器組 624第三可變增益放大器 632弟一低通遽波器 636第二類比數位轉換器 650數位解調器 654第二數位類比轉換器 4〇4射頻低通濾波器 408第一混頻器 410第二混頻器 412第二本地震盪器 604低雜訊放大器 606低通滤波器 608高通濾、波器 612正交混頻器 621處理電路 623第一低通濾波器 626第一類比數位轉換器 634第四可變增益放大器 640數位鏡像消除電路 652第一數位類比轉換器 656第三數位類比轉換器 16402 antenna 406 low noise transduction amplifier 409 first intermediate frequency filter 411 present seismicizer 602 antenna 605 first variable gain amplifier 607 second variable gain amplifier 610 resonant rejection and orthogonal mixer 620 earthquake Fort 622 voltage controlled oscillator group 624 third variable gain amplifier 632 brother a low pass chopper 636 second analog digital converter 650 digital demodulator 654 second digital analog converter 4 〇 4 RF low pass filter 408 first mixer 410 second mixer 412 second present oscillator 604 low noise amplifier 606 low pass filter 608 high pass filter, wave 612 quadrature mixer 621 processing circuit 623 first low pass filter 626 first analog-to-digital converter 634 fourth variable gain amplifier 640 digital image cancellation circuit 652 first digital analog converter 656 third digital analog converter 16