TWI395479B

TWI395479B - Tuner

Info

Publication number: TWI395479B
Application number: TW98134529A
Authority: TW
Inventors: Hsien Cheng Chen
Original assignee: Novatek Microelectronics Corp
Priority date: 2009-10-12
Filing date: 2009-10-12
Publication date: 2013-05-01
Also published as: TW201114260A

Description

調協器Tuner

本發明是有關於一種調協器(tuner)，且特別是有關於一種可支援數位電視(Digital Television)及類比電視(Analog Television)訊號之接收操作的調協器。The present invention relates to a tuner, and more particularly to a tuner that can support the receiving operation of digital television and analog television signals.

隨著通訊技術及壓縮技術的進步，全球的電視廣播已從類比電視廣播逐漸地替換成數位電視廣播。數位廣播的變革將帶動相關產業的迅速發展，數位電視及機上盒(Set-Top-Box，STB)就是其中一環。在現有技術中，節目供應系統業者利用頭端設備將數位電視信號傳送到用戶端，用戶端可利用數位電視機、機上盒、或其它支援播放標準的數位接收系統，將接收信號做各種數位處理後，呈現出電視節目或影音多媒體。接收機中主要應用調協器(tuner)來進行訊號傳輸。With the advancement of communication technology and compression technology, global television broadcasting has gradually been replaced by digital television broadcasting from analog television broadcasting. The revolution in digital broadcasting will drive the rapid development of related industries. Digital TV and Set-Top-Box (STB) are one of them. In the prior art, the program supply system provider uses the head end device to transmit the digital television signal to the user end, and the user terminal can use the digital television, the set-top box, or other digital receiving system supporting the playing standard to make the received signal into various digits. After processing, a television program or video multimedia is presented. In the receiver, the tuner is mainly used for signal transmission.

一般來說，調諧器用以將接收的射頻(Radio Frequency)信號放大並降頻到中頻(Intermediate Frequency)範圍。之後經過數位類比轉換器(Analog to Digital Converter)之轉換，再給解調器做解調的動作。然而，隨著科技的發展日新月異，如何設計出可有效地具有更多附加功能之調協器為業界不斷致力的方向之一。Generally, a tuner is used to amplify and down-convert a received radio frequency (Radio Frequency) signal to an intermediate frequency (Intermediate Frequency) range. After that, it is converted by a digital to analog converter (Analog to Digital Converter), and then demodulated by the demodulator. However, with the rapid development of technology, how to design a tuning device that can effectively have more additional functions is one of the direction that the industry is constantly striving for.

本發明係有關於一種調協器(Tuner)，可支援數位電視(Digital Television)訊號及類比電視(Analog Television)訊號之接收操作。如此，相較於傳統調協器，本發明相關之調協器可有效地具有可支援數位及類比電視訊號之接收、應用場合較廣及附加價值較高之優點。The invention relates to a Tuner, which can support the receiving operation of a digital television signal and an analog television signal. Thus, compared with the conventional tuner, the tuner related to the present invention can effectively support the reception of digital and analog television signals, and has the advantages of wide application and high added value.

根據本發明之一方面，提出一種調協器，可支援數位電視(Digital Television)訊號及類比電視(Analog Television)訊號之接收操作。調協器包括低雜訊放大器(Low Noise Amplifier)、正交混波器(Quadrature Mixer)、通道濾波器(Channel Filter)、升頻模組及切換電路。低雜訊放大器用以接收輸入射頻訊號並提供處理後射頻訊號。正交混波器用以接收並對處理後射頻訊號進行降頻操作(Down Conversion)，以產生低中頻(Low Intermediate Frequency，Low IF)訊號。通道濾波器用以對低中頻訊號進行濾波操作以產生第一訊號，第一訊號對應至數位電視之訊號頻帶。升頻模組用以對低中頻訊號進行升頻操作，以產生第二訊號，第二訊號對應至類比電視之訊號頻帶。切換電路受控於選擇訊號選擇性地致能通道濾波器及升頻模組其中之一，以選擇性地提供第一及第二訊號其中之一。According to an aspect of the present invention, an adjustment device is provided, which can support the receiving operation of a digital television signal and an analog television signal. The tuning device includes a Low Noise Amplifier, a Quadrature Mixer, a Channel Filter, an up-conversion module, and a switching circuit. The low noise amplifier is used to receive the input RF signal and provide the processed RF signal. The quadrature mixer is configured to receive and down-convert the processed RF signal to generate a Low Intermediate Frequency (Low IF) signal. The channel filter is configured to filter the low intermediate frequency signal to generate the first signal, and the first signal corresponds to the signal frequency band of the digital television. The up-converter module is configured to up-convert the low-IF signal to generate a second signal, and the second signal corresponds to a signal band of the analog television. The switching circuit is controlled by the selection signal to selectively enable one of the channel filter and the up-conversion module to selectively provide one of the first and second signals.

為讓本發明之上述內容能更明顯易懂，下文特舉一較佳實施例，並配合所附圖式，作詳細說明如下：In order to make the above-mentioned contents of the present invention more comprehensible, a preferred embodiment will be described below, and in conjunction with the drawings, a detailed description is as follows:

請參照第1圖，其繪示依照本發明實施例之調協器的方塊圖。調協器(Tuner)1應用於電視訊號接收機(未繪示)中，用以接收電視訊號。電視訊號接收機例如包括天線模組2，用以接收射頻訊號SRF，並對應地提供輸入射頻訊號SRF_i。舉例來說，天線模組2中包括天線Ant及濾波器Flt。Please refer to FIG. 1 , which is a block diagram of a tuner in accordance with an embodiment of the present invention. The Tuner 1 is applied to a television signal receiver (not shown) for receiving television signals. The television signal receiver includes, for example, an antenna module 2 for receiving an RF signal SRF and correspondingly providing an input RF signal SRF_i. For example, the antenna module 2 includes an antenna Ant and a filter Flt.

調協器1例如可支援數位電視(Digital Television)訊號及類比電視(Analog Television)訊號之接收操作。調協器1包括低雜訊放大器(Low Noise Amplifier)10、正交混波器(Quadrature Mixer)12、通道濾波器14、升頻模組16及切換電路18。低雜訊放大器10用以接收天線模組2提供之輸入射頻訊號SRF_i，並提供處理後射頻訊號。舉例來說，處理後射頻訊號係以差動(Differential)方式傳送，而包括訊號部份SRF_o⁺ 及訊號部份SRF_o^- 。The tuner 1 can support, for example, a digital television signal and an analog television signal receiving operation. The tuner 1 includes a Low Noise Amplifier 10, a Quadrature Mixer 12, a channel filter 14, an up-conversion module 16, and a switching circuit 18. The low noise amplifier 10 is configured to receive the input RF signal SRF_i provided by the antenna module 2 and provide a processed RF signal. For example, the processed RF signal is transmitted in a differential manner, including the signal portion SRF_o ⁺ and the signal portion SRF_o ^- .

正交混波器12用以接收並對處理後射頻訊號SRF_o⁺ 及SRF_o^- 進行降頻操作(Down Conversion)，以產生低中頻(Low Intermediate Frequency)訊號。舉例來說，正交混波器12包括訊號轉換器120、複頻混波器(Complex Mixer)122及中頻多相位濾波器(Intermediate Frequency Poly-phase Filter)126，如第2圖所示。The quadrature mixer 12 is configured to receive and perform a down conversion of the processed RF signals SRF_o ⁺ and SRF_o ^- to generate a Low Intermediate Frequency signal. For example, the quadrature mixer 12 includes a signal converter 120, a complex mixer 122, and an intermediate frequency poly-phase filter 126, as shown in FIG.

訊號轉換器120用以對處理後射頻訊號SRF_o⁺ 及SRF_o^- 進行轉換，以產生對應之射頻複數訊號，其中射頻複數訊號包括訊號部份SRF_I⁺ 、SRF_I^- 、SRF_Q⁺ 及SRF_Q^- 。其中訊號部份SRF_I⁺ 、SRF_I^- 為實部(Real Component)訊號，SRF_Q⁺ 與SRF_Q^- 為虛部(Imaginary Component)訊號。The signal converter 120 is configured to convert the processed RF signals SRF_o ⁺ and SRF_o ^- to generate corresponding RF complex signals, wherein the RF complex signals include signal portions SRF_I ⁺ , SRF_I ^- , SRF_Q ⁺ and SRF_Q ^- . The signal parts SRF_I ⁺ and SRF_I ^- are real component signals, and SRF_Q ⁺ and SRF_Q ^- are imaginary component signals.

複頻混波器122例如以4個乘法器(Multiplier)來實現，用以對正交訊號及射頻複數訊號(包括訊號部份SRF_I⁺ 、SRF_I^- 、SRF_Q⁺ 及SRF_Q^- )進行混波，以產生低中頻正交訊號。舉例來說，正交訊號包括訊號部份SOL_I⁺ 、SOL_I^- 、SOL_Q⁺ 及SOL_Q^- 。正交混波器12例如更包括振盪器128及除頻器126，正交訊號例如由除頻器126，對振盪器128提供之振盪訊號進行除二頻而得到。振盪訊號例如包括訊號部份SOL⁺ 及SOL^- 。The complex frequency mixer 122 is implemented, for example, by four multipliers for mixing orthogonal signals and RF complex signals (including signal portions SRF_I ⁺ , SRF_I ^- , SRF_Q ^{+ ,} and SRF_Q ^- ) to Generate low IF quadrature signals. For example, the orthogonal signal includes signal portions SOL_I ⁺ , SOL_I ^- , SOL_Q ^{+ ,} and SOL_Q ^- . The quadrature mixer 12 further includes, for example, an oscillator 128 and a frequency divider 126. The orthogonal signal is obtained by, for example, a frequency divider 126, and the oscillation signal provided by the oscillator 128 is divided by two frequencies. The oscillating signal includes, for example, the signal portions SOL ⁺ and SOL ^- .

中頻多相位濾波器124，用以抑制低中頻正交訊號(複頻混波器122輸出)中之負頻率(Negative Frequency)，以消除低中頻正交訊號中之虛擬頻率，以產生低中頻訊號。舉例來說，低中頻訊號包括訊號部份SIF⁺ 及SIF^- 。The intermediate frequency polyphase filter 124 is configured to suppress a negative frequency in the low intermediate frequency orthogonal signal (the output of the complex frequency mixer 122) to eliminate the virtual frequency in the low intermediate frequency orthogonal signal to generate Low IF signal. For example, the low IF signal includes the signal parts SIF ⁺ and SIF ^- .

通道濾波器14用以對低中頻訊號進行濾波操作，以產生第一訊號S1。舉例來說，第一訊號S1之頻率接近5百萬赫茲(Mega Hertz，MHz)，其對應至數位電視之訊號頻帶。調協器1中更例如包括增益可編程放大器(Programmable Gain Amplifier)20，用以對通道濾波器14提供之第一訊號S1進行放大操作，並將產生之訊號提供至相關數位電視訊號處理單元。The channel filter 14 is configured to perform a filtering operation on the low intermediate frequency signal to generate the first signal S1. For example, the frequency of the first signal S1 is close to 5 megahertz (Mega Hertz, MHz), which corresponds to the signal band of the digital television. The modulator 1 further includes, for example, a gain programmable amplifier (Programmable Gain Amplifier) 20 for amplifying the first signal S1 provided by the channel filter 14 and providing the generated signal to the associated digital television signal processing unit.

升頻模組16用以對低中頻訊號進行升頻操作，以產生第二訊號S2，第二訊號S2之頻率例如對應至類比電視之訊號頻帶，例如是36MHz。舉例來說，升頻模組16包括：濾波器160、升頻混波器(Up Mixer)162、除頻器166及振盪器168，如第3圖所示。The up-converting module 16 is configured to perform an up-conversion operation on the low-IF signal to generate a second signal S2. The frequency of the second signal S2 corresponds to, for example, a signal band of the analog television, for example, 36 MHz. For example, the up-conversion module 16 includes a filter 160, an up mixer 162, a frequency divider 166, and an oscillator 168, as shown in FIG.

濾波器160中包括濾波器單元160a及160b，分別用以濾除低中頻訊號中之二階諧波成分及三階諧波成分，以產生濾波後低中頻訊號。升頻混波器162例如由兩個乘法器來實現，用以對參考訊號及濾波後中頻訊號進行混波，以產生第二訊號S2。舉例來說，升頻模組16更包括振盪器168及除頻器166，參考訊號例如由除頻器166，對振盪器168提供之振盪訊號進行除頻得到。The filter 160 includes filter units 160a and 160b for filtering the second harmonic component and the third harmonic component of the low intermediate frequency signal to generate the filtered low intermediate frequency signal. The up-converter 162 is implemented, for example, by two multipliers for mixing the reference signal and the filtered IF signal to generate the second signal S2. For example, the up-conversion module 16 further includes an oscillator 168 and a frequency divider 166. The reference signal is obtained by, for example, the frequency divider 166, and the oscillation signal provided by the oscillator 168 is divided.

舉例來說，升頻模組16更包括驅動放大器164，用以對升頻混波器162產生之第二訊號S2進行放大操作，並將放大後之第二訊號S2輸出。For example, the up-converter module 16 further includes a driver amplifier 164 for amplifying the second signal S2 generated by the up-converter mixer 162 and outputting the amplified second signal S2.

切換電路18耦接至正交混波器12、通道濾波器14及升頻模組16。切換電路18受控於選擇訊號Ss1選擇性地致能通道濾波器14及升頻模組16其中之一，以選擇性地提供第一及第二訊號S1及S2其中之一。舉例來說，切換電路18例如經由選擇性地提供低中頻訊號至通道濾波器14及升頻模組16其中之一，以選擇性地致能其之操作。在另一個例子中，切換電路18經由選擇性地致能通道濾波器14之供電路徑及升頻模組16之供電路徑，來達到選擇性地致能通道濾波器14及升頻模組16其中之一之操作。The switching circuit 18 is coupled to the quadrature mixer 12, the channel filter 14, and the upscaling module 16. The switching circuit 18 is selectively enabled by the selection signal Ss1 to selectively enable one of the channel filter 14 and the up-conversion module 16 to selectively provide one of the first and second signals S1 and S2. For example, switching circuit 18 selectively provides low IF signals to one of channel filter 14 and upscaling module 16, for example, to selectively enable its operation. In another example, the switching circuit 18 selectively activates the channel filter 14 and the up-converting module 16 by selectively enabling the power path of the channel filter 14 and the power supply path of the up-converting module 16. One of the operations.

本發明實施例之調協器設置有可支援數位電視訊號頻段及類比電視訊頻段訊號操作之電路，而可支援數位電視(Digital Television)訊號及類比電視(Analog Television)訊號之接收操作。如此，相較於傳統調協器，本發明相關之調協器可有效地具有可支援數位及類比電視訊號之接收、應用場合較廣及附加價值較高之優點。The tuners of the embodiments of the present invention are provided with circuits for supporting the digital television signal frequency band and the analog television frequency band signal operation, and can support the receiving operation of the digital television signal and the analog television signal. Thus, compared with the conventional tuner, the tuner related to the present invention can effectively support the reception of digital and analog television signals, and has the advantages of wide application and high added value.

綜上所述，雖然本發明已以一較佳實施例揭露如上，然其並非用以限定本發明。本發明所屬技術領域中具有通常知識者，在不脫離本發明之精神和範圍內，當可作各種之更動與潤飾。因此，本發明之保護範圍當視後附之申請專利範圍所界定者為準。In view of the above, the present invention has been disclosed in a preferred embodiment, and is not intended to limit the present invention. A person skilled in the art can make various changes and modifications without departing from the spirit and scope of the invention. Therefore, the scope of the invention is defined by the scope of the appended claims.

1．．．調頻器1. . . Frequency modulator

12．．．正交混波器12. . . Orthogonal mixer

14．．．通道濾波器14. . . Channel filter

16．．．升頻模組16. . . Upsampling module

18．．．切換電路18. . . Switching circuit

20、164．．．驅動放大器20,164. . . Drive amplifier

2．．．天線模組2. . . Antenna module

Ant．．．天線Ant. . . antenna

Flt、160．．．濾波器Flt, 160. . . filter

120．．．訊號轉換器120. . . Signal converter

122．．．複頻混波器122. . . Multi-frequency mixer

124．．．中頻多相位濾波器124. . . IF multiphase filter

126、166．．．除頻器126, 166. . . Frequency divider

128、168．．．振盪器128,168. . . Oscillator

162．．．升頻混波器162. . . Up-conversion mixer

160a、160b．．．濾波器單元160a, 160b. . . Filter unit

第1圖繪示本發明實施例之調協器的方塊圖。FIG. 1 is a block diagram of a tuner of an embodiment of the present invention.

第2圖繪示乃第1圖中之正交混波器12的詳細方塊圖。Fig. 2 is a detailed block diagram of the orthogonal mixer 12 in Fig. 1.

第3圖繪示乃第1圖中之升頻模組的詳細方塊圖。Figure 3 is a detailed block diagram of the up-converter module in Figure 1.

1．．．調頻器1. . . Frequency modulator

12．．．正交混波器12. . . Orthogonal mixer

14．．．通道濾波器14. . . Channel filter

16．．．升頻模組16. . . Upsampling module

18．．．切換電路18. . . Switching circuit

20．．．驅動放大器20. . . Drive amplifier

2．．．天線模組2. . . Antenna module

Ant．．．天線Ant. . . antenna

Flt．．．濾波器Flt. . . filter

Claims

一種調協器(Tuner)，可用以支援數位電視(Digital Television)訊號及類比電視(Analog Television)訊號之接收操作，該調協器包括：一低雜訊放大器(Low Noise Amplifier)，用以接收一輸入射頻訊號，並提供一處理後射頻訊號；一正交混波器(Quadrature Mixer)，用以接收並對該處理後射頻訊號進行降頻操作(Down Conversion)，以產生一低中頻(Low Intermediate Frequency，Low IF)訊號；一通道濾波器(Channel Filter)，用以對該低中頻訊號進行濾波操作，以產生一第一訊號，該第一訊號對應至數位電視之訊號頻帶；一升頻模組，用以對該低中頻訊號進行升頻操作，以產生一第二訊號，該第二訊號對應至類比電視之訊號頻帶；以及一切換電路，受控於一選擇訊號選擇性地致能該通道濾波器及該升頻模組其中之一，以選擇性地提供該第一及該第二訊號其中之一。A Tuner can be used to support the receiving operation of a Digital Television signal and an Analog Television signal. The Tuner includes: a Low Noise Amplifier for receiving An input RF signal and a processed RF signal; a Quadrature Mixer for receiving and down-converting the processed RF signal to generate a low intermediate frequency ( a low-frequency signal (Low IF) signal; a channel filter for filtering the low-IF signal to generate a first signal corresponding to the signal band of the digital television; An up-converting module for up-converting the low-IF signal to generate a second signal, the second signal corresponding to a signal band of the analog television; and a switching circuit controlled by a selective signal selective One of the channel filter and the up-conversion module is enabled to selectively provide one of the first and second signals.

如申請專利範圍第1項所述之調協器，其中該升頻模組包括：一濾波器，用以濾除該低中頻訊號中之二階諧波成分及三階諧波成分，以產生一濾波後低中頻訊號；及一升頻混波器(Up Mixer)，用以對一參考訊號及該濾波後低中頻訊號進行混波(Mixing)，以產生該第二訊號。The tuned module of claim 1, wherein the up-conversion module comprises: a filter for filtering second-order harmonic components and third-order harmonic components of the low-IF signal to generate a filtered low-IF signal; and an Up Mixer for mixing a reference signal and the filtered low-IF signal to generate the second signal.

如申請專利範圍第2項所述之調協器，其中該升頻模組更包括：一振盪器，用以提供一振盪訊號；及一除頻器，用以根據該振盪訊號除頻產生該參考訊號，並將該參考訊號提供至該升頻混波器。The modulating device of claim 2, wherein the up-converting module further comprises: an oscillator for providing an oscillating signal; and a frequency divider for generating the frequency according to the oscillating signal The reference signal is provided to the up-converter.

如申請專利範圍第2項所述之調協器，其中該升頻模組更包括：一驅動放大器，用以對升頻混波器產生之該第二訊號進行放大操作。The tuned module of claim 2, wherein the up-converter module further comprises: a driver amplifier for amplifying the second signal generated by the up-converter mixer.

如申請專利範圍第1項所述之調協器，其中該正交混波器包括：一訊號轉換器，用以對該處理後射頻訊號進行轉換，以產生對應之一射頻複數訊號；一複頻混波器(Complex Mixer)，用以對一正交訊號及該射頻複數訊號進行混波，以產生一低中頻正交訊號；及一中頻多相位濾波器(IF Poly-phase Filter)，用以過濾該低中頻正交訊號，以產生該低中頻訊號。The tuned device of claim 1, wherein the orthogonal mixer comprises: a signal converter for converting the processed RF signal to generate a corresponding one of the RF signals; A Mixer is used to mix an orthogonal signal and the RF complex signal to generate a low intermediate frequency orthogonal signal; and an IF Poly-phase Filter And filtering the low intermediate frequency orthogonal signal to generate the low intermediate frequency signal.

如申請專利範圍第5項所述之調協器，其中該正交混波器更包括：一振盪器，用以提供一振盪訊號；及一除頻器，用以根據該振盪訊號除頻產生該正交訊號。The modulating device of claim 5, wherein the quadrature mixer further comprises: an oscillator for providing an oscillating signal; and a frequency divider for dividing the frequency by the oscillating signal The orthogonal signal.