KR101616282B1

KR101616282B1 - Hybrid television tuner

Info

Publication number: KR101616282B1
Application number: KR1020150132183A
Authority: KR
Inventors: 우장복; 김종섭
Original assignee: (주)넥서스일렉트로닉스
Priority date: 2015-09-18
Filing date: 2015-09-18
Publication date: 2016-04-28

Abstract

The present invention relates to a hybrid TV tuner with reduced power consumption and noise factor and improved receiving sensitivity, wherein the hybrid TV tuner itself supports an automatic country-specific channel set up function so as to enable watching TV in a corresponding area in any part of the world without a separate device. The hybrid TV tuner includes: a frequency processing unit configured to receive an RF signal from an antenna and determine a frequency type of the RF signal among NTSC, PAL, SECAM, ATSC, QAM, DVB-T2/T/C2/C, ISDB-T/C and DTMB; an RF circuit configured to convert the RF signal processed in the frequency processing unit to an IF signal; an analog demodulator activated when a TV system determined in the frequency processing unit is an analog type, and configured to demodulate the IF signal received from the RF circuit according to an analog TV demodulation scheme determined in the frequency processing unit; a digital FEC decoder activated when the TV system determined in the frequency processing unit is digital, and configured to decode the IF signal received from the RF circuit into a TS signal according to a digital TV decoding scheme determined in the frequency processing unit.

Description

Hybrid TV tuner

TECHNICAL FIELD [0001] The present invention relates to a hybrid TV tuner and, more particularly, to a TV, and more particularly, to a system and method for a TV system, such as a National System Television Committee (NTSC), a Phase Alternate Line (PAL), a Systems Equal Couple Memoire (SECAM) ), QAM (Quadrature Amplitude Modulation), DVB (Digital Video Broadcast) -T2 / T / C2 / C, ISDB (Integrated Service Digital Broadcasting) -T / C, DTMB (Digital Terrestrial Multimedia Broadcast) It is a tuner for TV that is implemented as a single module that can watch TV broadcast. It is able to set an automatic channel for each country and is strong against interference with wireless signals such as LTE, Bluetooth, Wi-Fi, Tuner.

Worldwide TV market demand is growing at 230 million units annually, and many countries are implementing their own analog transition plans at various stages, including terrestrial analog broadcasting, which is being replaced by high-definition digital broadcasting. As a result, the market for TV tuners, which are directly affected by the market conditions of the related industries and related devices, is being rapidly installed in parts installed in broadcasting devices receiving broadcast signals such as TVs and set-top boxes. In particular, digital TV tuner built-in for iDTV (Integrated Digital Television) platform (about 160 million units) and analogue TV (about 70 million units) related to TV tuner (hereinafter referred to as "TV tuner" Is mandatory. The digital tuner is divided into a NIM (Network Interface Module) integrated with a demodulator and a Half NIM tuner with a demodulator excluded. The ATSC terrestrial tuner, the European type DVB-T terrestrial tuner, the DVB-S satellite tuner , And DVB-C cable tuner.

In general, a TV tuner selects a desired channel from among a plurality of TV broadcast signals (RF) to exclude an interference signal and converts it into an intermediate frequency (IF) that can be processed by a demodulator. Converts the IF signal into a baseband signal (audio, video signal). In order to convert the signal into an IF signal, an arbitrary oscillator frequency is oscillated to make a difference from the RF signal. A tuner is also called a tuner. It is a device that captures only the frequency of a desired station and converts the frequency among many radio waves. A single part (a capacitor, a resistor, an inductor, a diode, an IC, a PCB, etc.) As shown in FIG.

The TV tuner is being replaced by a mixer oscillator phase-locked loop (MOPLL) CAN tuner suitable for conventional analog TVs with a silicon on-chip (SOC) type tuner suitable for digital TVs. Tuner is a core component that tunes TV signals to the input device by tuning with specific radio waves. Therefore, when analog broadcasting is main, CAN tuner with hundreds of components mounted on the board is embedded in set-top box and TV etc., but slim As flat TVs spread, the proportion of silicon tuners that can be smaller, slimmer, and power-saving than CAN tuners is rapidly increasing.

The silicon tuner is a component that implements a demodulator, a video decoder, and graphics functions in a SOC (System On Chip) type semiconductor. It includes not only analog RF circuits but also circuits that demodulate signals modulated by Orthogonal Frequency Division Multiplexing (OFDM), which are integrated on a chip or configured as a System-in-Package (SiP). The RF architecture of the RF circuitry is an important choice when choosing a silicon tuner, while the Low IF (Intermediate Frequency) architecture is employed in the receive circuitry of short-range communications technologies such as Bluetooth, SAW filters and other external components are not required.

In the meantime, television broadcasting standards include NTSC, PAL, and SECAM for analog signals and ATSC, QAM, DVB-T2 / T / C2 / C, ISDB-T / C, and DTMB for digital signals. Different countries use different broadcasting standards. Korea and the US use NTSC and ATSC, DVB-T / T2, PAL in Europe, ISDB-T in Japan and Brazil, and DTMB standard in China. Therefore, when using a conventional CAN tuner, it is troublesome to design TV parts differently for each standard. Therefore, the adoption of a hybrid TV tuner capable of simultaneously supporting various national standards by using a silicon tuner is increasing.

In the recent TV market, OLED and ULTRA HD (4k, 3840 × 2160 resolution), so the TV tuner market attracts attention with the hybrid TV tuner that supports slimming, low power, low defect rate, .

Hybrid TV tuners have been adopted in the market in earnest since 2011, and technologically, they have just entered a fast-growing period. There are still many technological improvements to be made. In particular, the automatic channel setting function by country has not been applied to the present.

In addition, the latest smart TVs extend the range of program sources beyond antennas and cables, and as applications migrate to large-screen TVs, Wi-Fi, Ethernet and LTE are used as communication interfaces for new TVs do. Therefore, a problem of collision between various signals and broadcasting signals occurs due to such an interface. TV tuner technology for protecting broadcasting signals from such interference becomes more important. That is, it is an important performance element of the hybrid TV tuner that strong interference of the surrounding radio signal, good broadcasting reception sensitivity, and low power consumption are emerging.

In addition, current analog and digital tuners with digital only, multichannel digital only, analog and digital tuners, analog TV demodulators, and tuner and demodulator closely coexist in a variety of receiver configurations, , TV tuners are required that support many architectural configurations to easily integrate with SOC devices.

1 shows a high-level block diagram of a general-purpose television receiver 100 of a patent for a general-purpose television receiver (KR 10-0843398 B1, June 26, 2008, hereinafter referred to as "Prior Art 1").

Prior Art 1 is a technology supporting reception of NTSC, SECAM, PAL, ATSC, DVB-T, and ISDB-T broadcasts and includes an RF processing block 102 for receiving and processing RF signals, a coarse ), An analog processing block 104 that provides filtering and amplification, an ADC 106 that converts the signals generated in the analog processing block to digital signals, a digital processing block 108 that obtains video and audio information for the desired television channel signal And a DAC block 110 that tracks the carrier frequency of the desired television channel signal and generates a frequency shift feedback signal to compensate for frequency shifts at the carrier frequency.

FIG. 2 is a configuration diagram of a hybrid tuner of a registered patent (KR 10-0856264 B1, 2008.08.27, hereinafter referred to as "Prior Art 2") for a hybrid tuner.

Prior Art 2 relates to a hybrid tuner capable of selectively supplying power to a digital IF amplifier and an analog demodulator in a hybrid tuner including a digital tuner and an analog tuner. The hybrid tuner includes a digital tuner for selecting a digital TV broadcast, A tuner unit 100 having an analog tuner for selecting a tuner, a power supply unit 200 for supplying operation power, a power switching unit for selecting the operation power of the power supply unit when selecting a digital broadcast, A digital circuit unit 410 receiving the operating power selected by the power switching unit when the digital broadcasting is selected and processing the IF signal from the digital tuner, And an analog to process the signal from the analog tuner It consists robu 420.

3 is a configuration diagram of a dual hybrid TV receiving apparatus of a dual hybrid TV receiving apparatus (KR 10-0843398 B1, June 26, 2008, hereinafter referred to as "prior art 3").

Prior Art 3 relates to a dual hybrid TV receiver that implements a dual analog tuner for PIP of an analog TV broadcast and a dual digital tuner for PIP of a digital TV broadcast in a single package, And supports two PIPs for analog and digital broadcasting by configuring two RF circuits 310 and 320 supporting both of them. In the prior art 3, analog TV demodulation is one of NTSC, PAL, SECOM, and digital TV demodulation is one of DVB-T, DMB-T, DVB-S and DMB-S.

FIG. 4 is a block diagram illustrating a method of automatically setting a TV signal to a tuner device having one or more TV tuners in a registered patent (KR 10-1099354 B1, December 20, 2011, hereinafter referred to as "Prior Art 4" Lt; RTI ID = 0.0 > environment < / RTI >

Prior art 4 relates to a system and method for performing automatic TV signal / tuner setup in a tuner device (e.g., a PC, personal video recorder, set-top box, etc.) having one or more tuners, Identifies the number of tuners in the tuner device, identifies whether the tuners are analog or digital, and identifies which broadcast standards each tuner supports. Also, in the prior art 4, a geographical area in which the tuner device is to receive a TV signal is identified, and tuners supporting the area are identified. Digital tuners are reported to be digital whereas analog tuners are scanned to find the location of a valid TV signal to determine any valid TV signal source (e.g., antenna, cable provider, set-top box). That is, the prior art 4 identifies the number of tuners in the apparatus, the type of the tuner, and the broadcasting standard to be supported, and automatically scans the TV signal until a valid TV signal is found sequentially.

As described above, various studies have been made on TV tuners capable of simultaneously receiving an analog TV and a digital TV. However, the tuners according to the prior art shown in FIGS. 1 to 4 are not limited to specific standards A signal can not be discriminated with respect to broadcasting standards other than the specific standard. Therefore, automatic frequency selection is impossible and the corresponding broadcasting signal can not be received.

KR 10-0843398 B1 (June 26, 2008) KR 10-0856264 B1 (2008.08.27) KR 10-2009-0022009 A (2009.03.04) KR 10-0986192 B1 (2010.10.01) KR 10-2010-0113708 A (2010.10.22) KR 10-1099354 B1 (2011.12.20) KR 10-1374919 B1 (2014.03.10)

It is an object of the present invention to solve the above-mentioned problems and it is an object of the present invention to overcome the above problems by providing all broadcasting standards of the world such as NTSC, PAL, SECAM, ATSC, QAM, DVB-T2 / T / The present invention provides a hybrid TV tuner capable of receiving a TV broadcast in an area where a TV is installed without additional setting and shielding surrounding radio signal interference, thereby reducing a noise figure and improving analog reception sensitivity.

In order to achieve the above object, the hybrid TV tuner according to the present invention is a hybrid NIM type including both analog and digital demodulation functions, and includes a frequency processor, an RF circuit, an analog demodulator, a digital FEC decoder ).

According to another aspect of the present invention, there is provided a hybrid TV tuner comprising: an RF receiver for receiving an RF signal from an antenna and converting the RF signal into NTSC, PAL, SECAM, ATSC, QAM, DVB-T2 / T / An RF circuit section for converting an RF signal processed by the frequency processing section into an IF signal, and a control section for controlling the operation when the TV mode determined by the frequency processing section is analog An analog demodulating unit for demodulating the IF signal from the RF circuit unit according to the analog TV demodulation method determined by the frequency processing unit and an IF demodulating unit operating from the RF circuit unit when the TV system determined by the frequency processing unit is digital, And a digital FEC decoder for decoding the signal into a TS signal according to a digital TV decoding scheme determined by the frequency processor, the hybrid TV tuner comprising: The waveness-processing section is a broadband LNA that removes noise by using a common source amplifier, a common gate amplifier, and a current mirror based combine network. An RF AGC for adjusting a gain of the wideband LNA with respect to an impedance value matching a corresponding frequency band of the wideband LNA by supplying a constant level of input power to the wideband LNA through a low noise amplifier and a broadband peak rectification detection, A RX BPF (RX Band Pass Filter) for eliminating unwanted waves included in the amplified signal from the wideband LNA and passing a desired reception frequency with a low loss, and a frequency characteristic of a global broadcasting standard are inputted in an array form, To find the most similar value to the receiving frequency of the current TV, And a look-up table (LUT) to set the look-up table.

In addition, in the hybrid TV tuner according to the present invention, the frequency processor may change a N channel temperature noise factor for optimal performance and minimum power consumption of the wideband LNA, while varying N values according to Equation (6) .

(6)

Here, F is the channel noise factor of the transistor (Channel thermal noise factor), α1 is g _m1 / g _do1 and, g _m1 and g _m3 is the transconductance, g _do1 the voltage V between the drain and the source of each transistor M1 and transistor M3 The channel conductance at _DS = 0V, γ is the thermal noise at V _DS = 0V, the thermal noise ratio at a given drain bias, and N is the size ratio of the transistors constituting the current mirror of the amplifier.

In addition, in the hybrid TV tuner according to the present invention, the LUT is inputted in the form of an array in which the frequency characteristics of the broadcasting standards of the world are inputted in the form of an array, and the most similar value to the value of the RX BPF is found, And the channel is automatically set by using it.

In addition, in the hybrid TV tuner according to the present invention, it is preferable that the LUT further includes a non-standard TV broadcasting method, and automatically selects a channel of a region where the TV is installed even for non-standard TV broadcasting signals to be monitored.

In the hybrid TV tuner according to the present invention, it is preferable that a plurality of the analog demodulating units and the digital FEC decoders are provided so that an analog PIP function and a digital PIP function can be implemented.

As described above, the present invention supports an automatic channel setting function for each country by a TV tuner itself, so that there is an advantage that a TV can be watched in a local area without a separate apparatus in any part of the world.

In addition, the present invention implements the automatic channel setting function for each country as embedded software, and differentiating functions are provided, so that it is continuously updated using software update even after the finished product is released.

In addition, the present invention has the effect of reducing power consumption, noise figure, and receiving sensitivity compared to the prior art by applying a wideband RF front-end and simplifying and optimizing the internal design.

As a result, it is possible to shorten product development time and cost reduction of TV and set-top box manufacturers applying the present invention, and to provide rapid development support to domestic small-sized TV and set-top box manufacturers, It is expected to contribute.

FIGS. 1 to 4 are views for explaining a conventional hybrid TV tuner,
5 is a configuration diagram of a hybrid TV tuner according to the present invention,
FIG. 6 is a detailed block diagram of a hybrid TV tuner according to the present invention shown in FIG. 5,
FIG. 7 is a view for explaining a noise removing effect applied to the wideband LNA of FIG. 6;
FIG. 8 is a diagram for explaining an operation flow of a lookup table (LUT) of a hybrid TV tuner according to the present invention; FIG.

Hereinafter, embodiments of a hybrid TV tuner according to the present invention will be described in detail with reference to the drawings. It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory and are intended to provide further explanation of the invention as claimed.

BRIEF DESCRIPTION OF THE DRAWINGS The same features of the Figures represent the same reference symbols wherever possible. It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory and are intended to provide further explanation of the invention as claimed. , &Lt; / RTI > equivalents, and alternatives. In the following description of the present invention, detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear.

The singular expressions include plural expressions unless the context clearly dictates otherwise. In the present application, the terms "comprises" or "having" and the like are used to specify that there is a feature, a number, a step, an operation, an element, a component or a combination thereof described in the specification, But do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, or combinations thereof.

Unless defined otherwise, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Terms such as those defined in commonly used dictionaries should be interpreted as having a meaning consistent with the meaning in the context of the relevant art and are to be interpreted in an ideal or overly formal sense unless explicitly defined in the present application Do not.

Each block of the accompanying block diagrams and combinations of steps of the flowchart may be performed by computer program instructions. These computer program instructions may be loaded into a processor of a general purpose computer, special purpose computer, or other programmable data processing apparatus so that the instructions, which may be executed by a processor of a computer or other programmable data processing apparatus, And means for performing the functions described in each step are created.

The hybrid TV tuner according to the present invention is characterized in that the automatic channel setting function for each country which is not supported by the prior art is implemented as embedded software and differentiated functions are provided so that the software can continuously update by using software update even after the finished product is released.

In addition, the hybrid TV tuner module according to the present invention is characterized in that it uses a wideband RF front-end and simplifies and optimizes internal design to reduce power consumption, noise figure, and receiver sensitivity compared to the prior art.

Hereinafter, a hybrid TV tuner according to a preferred embodiment of the present invention will be described in detail with reference to the drawings.

5 is a configuration diagram of a hybrid TV tuner according to the present invention. The hybrid TV tuner according to the present invention can be implemented as a hybrid NIM (Network Interface Module) including both analog and digital demodulation functions. An RF circuit unit 30, an analog demodulation unit 50 and a digital FEC decoder unit 70. The frequency processing unit 10, the RF circuit unit 30, the analog demodulation unit 50, and the digital FEC decoder unit 70 are shown in FIG.

The frequency processing unit 10 receives an RF signal from the antenna ANT and outputs the RF signal to the NTSC, PAL, SECAM, ATSC, QAM, DVB-T2 / T / , And DTMB. At this time, the frequency processor 10 according to the present invention transforms each frequency characteristic into a look-up table (LUT), and performs frequency mapping in software. The frequency processing unit 10 compares the frequency inputted from the antenna ANT with the LUT to confirm the broadcasting system and transmits the determined TV broadcasting system and RF signal to the RF circuit unit 30. [ Accordingly, the hybrid TV tuner according to the present invention is capable of automatic frequency selection. At this time, it is preferable that the automatically selected frequency is set so as to be able to transmit only the applied signal according to the country / region setting.

The RF circuit unit 30 receives an RF signal from the frequency processing unit 10 and converts the RF signal into an IF signal (intermediate frequency). The RF circuit unit 30 transmits an IF signal to the analog demodulation unit 50 when the input signal is an analog TV broadcast and transmits an IF signal to the digital FEC decoder 70 when the input signal is a digital TV broadcast.

The analog demodulator 50 operates when the TV broadcast system determined by the frequency processor 10 is analog TV broadcast. The analog demodulation unit 50 demodulates the IF signal input from the RF circuit unit 30 according to the analog TV demodulation method determined by the frequency processing unit 10 and outputs the video signal VS and the audio signal AS ).

The digital FEC decoder 70 operates when the TV broadcast system determined by the frequency processor 10 is digital TV broadcast. The digital FEC decoder 70 decodes the IF signal input from the RF circuit unit 30 into a TS (Transport Stream) signal according to the digital TV decoding method determined by the frequency processing unit 10, and outputs the decoded signal.

Accordingly, the hybrid TV tuner according to the present invention automatically receives the broadcast of the area where the TV is installed. In areas such as Europe, many analog and digital standards can be received over a single TV across a border. To cope with this exceptional reception situation, the hybrid TV tuner according to the present invention detects and transmits a non-standard transmission It is preferable to automatically select and output the broadcast in the area where the TV is installed.

In addition, the hybrid TV tuner according to the present invention further includes a function of shielding radio signals such as LTE, Bluetooth, and Wi-Fi. Generally, in the case of a silicon tuner, all functions are integrated into a SOC type, which causes frequent problems such as signal interference and spurious. Recently, due to the increase in the use of wireless communication devices and the use of various communication interfaces in a TV broadcasting environment, Fi, it is desirable to increase the reception sensitivity by shielding the interference of the internal / external radio signals.

FIG. 6 is a detailed block diagram of a hybrid TV tuner according to the present invention. Referring to FIG. 6, the hybrid TV tuner according to the present invention will be described in detail. As shown in FIG. 6, the hybrid TV tuner according to the present invention removes the external SAW filter by using a DSP (Digital Signal Processor) 71 to minimize deviation of adjacent bands and supports the worldwide TV broadcasting standard .

6, the broadband LNA 11 constituting the frequency processor 10 has a high gain, a wideband input matching, a low noise figure (LNF), and a low noise figure at an operating frequency (48 MHz to 880 MHz) Linearity, and flat frequency response. The wideband LNA 11 uses a common source amplifier, a common gate amplifier, and a current mirror based combine network to achieve a noise canceling effect Can be obtained. FIG. 7 shows the principle of the noise reduction effect of the wideband LNA 11 used in the hybrid TV tuner according to the present invention.

The hybrid TV tuner according to the present invention minimizes external signal noise by using a noise canceling effect to increase broadcasting reception sensitivity and minimize interference due to other radio signals such as LTE, Bluetooth, Wi-Fi, and the like. Techniques to be implemented for this purpose will be described in detail below.

1. Wideband input matching and gain

Since the wideband LNA 11 must maintain a constant impedance value in the 48 MHz to 880 MHz band, a gate common type amplifier having a wideband frequency characteristic is used. Since the overall input impedance of the gate common type amplifier is given by Equation (1), the gain of the wideband LNA 11 can be expressed by Equation (2) below.

Here, in order to increase the gain without affecting the input matching,

You can increase the value or the N value. The bandwidth (bandwidth) of the wideband LNA 11 is determined in order to determine an element that affects the gain, the following equation (3) is obtained.

2. Noise

The noise factor F can be expressed by the following equation (4) in the input matching state.

here,

,

Is the channel thermal noise factor of the transistor.

From the above equation (2), it is possible to derive that the gain of the gate common amplifier and the gain of the source common amplifier are the same, and the noise factor F when m = 1 is obtained.

Therefore, we can find a combination that shows optimal performance and power consumption while changing N values.

Referring again to FIG. 6, the RF AGC 12 (Automatic Gain Controller) supplies a certain level of input power to the mixer through the broadband peak rectification detection, and controls the gain block by software programming using the RF TOP .

The weak reception signal that has passed through the antenna ANT is amplified by the gain of the wideband LNA 11 in the wideband LNA 11. At this time, the signal amplified by the wideband LNA 11 is amplified RX BPF (13, Band Pass Filter) is used to eliminate these unwanted frequencies and to pass the desired receive frequency with low loss. In this case, the desired reception frequency refers to a value unique to the area where the TV is currently installed, which is input into the LUT (Look Up Table) 14.

In the LUT 14, the frequency characteristics of the broadcast standards of the world can be input in the form of an array (30 × 30), and can be updated by software. The most similar value to the value of the RX BPF 13 is found in the LUT 14 to check the broadcasting system where the current TV is located and it is possible to set an automatic channel for each country by using this. FIG. 8 is a diagram showing the operation flow of the LUT 14. FIG.

As described above, the frequency processing unit 10 of the hybrid TV tuner according to the present invention transmits NTSC, PAL, SECAM, ATSC, and ATSC signals to the RF signal received from the antenna ANT through the RX BPF 13 and the LUT 14, QAM, DVB-T2 / T / C2 / C, ISDB-T / C and DTMB and outputs the corresponding value and the RF signal RF to the converter 31 of the RX circuit unit 30 The hybrid TV tuner according to the present invention automatically selects and receives broadcasting in a region where a TV is installed. In particular, the hybrid TV tuner according to the present invention also includes a non-standard TV broadcasting method in the LUT 14 by software in addition to the broadcasting environment in which many analog and digital standards such as Europe are received through a single TV over a border , It is possible to automatically select and output a broadcast in a region where the TV is installed even for non-standard broadcast signals to be sensed.

In addition, the frequency processing unit 10 of the hybrid TV tuner according to the present invention shields the interference of the internal / external radio signals through the wideband LNA 11, the RF AGC 12 and the RX BPF 13, It is possible to minimize the signal interference and spurious generated by the silicon tuner and minimize the interference due to the use of various communication interfaces such as LTE, Bluetooth and Wi-Fi, thereby increasing the receiving sensitivity.

6, a received signal having an automatic channel set for each country via the RX BPF 13 and the LUT 14 is input to the converter 31, the converter 31, the RX IF BPF 32, The analog broadcast signal is supplied to the analog demodulation unit 50 via the PGAs 34 and 36 and the Q ADC 35 and the I ADC 37 which are gain-controlled by the IF AGC 33 and the IF AGC 33, The signal is applied to the digital FEC decoder 70.

The converter 31 of the RF circuit unit 30 receives the RF signal from which the unwanted wave has been removed from the RX BPF 13 of the frequency processing unit 10 and converts it into an IF signal (intermediate frequency) ). The RX IF BPF 32 removes unwanted waves generated in the process of converting the RF signal into the IF signal in the converter 31 and filters the desired reception frequency to pass through with a low loss. The signal output from the RX IF BPF 32 is supplied to the analog demodulation unit 50 via the PGA 34 and the Q ADC 35 constituting the circuit unit for the analog demodulation unit 50 when the input signal is analog TV broadcast The IF signal is transmitted to the ATV DEMOD 51. When the input signal is a digital TV broadcast signal, the digital FEC decoder 70 transmits the IF signal to the ATV DEMOD 51 via the PGA 36 and the I ADC 37 constituting the circuit portion for the digital FEC decoder 70 To the DSP 71 circuit of FIG.

The analog demodulator 50 operates when the TV broadcast system determined by the frequency processor 10 is analog TV broadcast. The analog demodulation unit 50 demodulates the IF signal input from the RF circuit unit 30 according to the analog TV demodulation method determined by the frequency processing unit 10 and outputs the video signal VS and the audio signal AS And an ATV DEMOD 51 and a LOW IF 53 so as to output an output signal.

The digital FEC decoder 70 is constituted by a DSP 71, a filter 73 and a DTV DEMOD 75 and operates when the TV broadcast system judged by the frequency processor 10 is digital TV broadcast. The digital FEC decoder 70 decodes the IF signal input from the RF circuit unit 30 into a TS (Transport Stream) signal according to the digital TV decoding method determined by the frequency processing unit 10, and outputs the decoded signal.

For example, the analog TV demodulation scheme processed by the analog demodulation unit 50 may be a demodulation scheme according to one of NTSC, PAL, and SECAM, and the digital TV demodulation process performed by the digital FEC decoder 70, The decoding method may be a decoding method according to one of ATSC, QAM, DVB-T2 / T / C2 / C, ISDB-T / C and DTMB.

Although not shown, a plurality of analog demodulation units 50 and digital FEC decoders 70 may be provided to realize an analog PIP function and a digital PIP function.

Description of the LDO (Low-Dropout Regulator) 20, the XOSC (Crystal Oscillator) 40 and the frequency synthesizer 60 will be omitted.

As described above, the hybrid TV tuner according to the present invention can be applied to a broadcasting standard of NTSC, PAL, SECAM, ATSC, QAM, DVB-T2 / T / It is possible to automatically select and receive TV broadcasts suitable for the area, and realize analog PIP and digital PIP.

Although the preferred embodiments of the present invention have been disclosed for illustrative purposes, those skilled in the art will appreciate that various modifications, additions and substitutions are possible, without departing from the scope and spirit of the invention as disclosed in the accompanying claims. Therefore, the scope of the present invention should not be limited by the described embodiments, but should be determined by the scope of the appended claims and equivalents thereof.

10: Frequency processor
11: broadband LNA 12: RF AGC
13: RX BPF 14: LUT
30: RF circuit section
50: analog demodulation unit
70: FEC decoder section

Claims

A frequency processor for receiving an RF signal from an antenna and determining whether the RF signal is a NTSC, a PAL, a SECAM, an ATSC, a QAM, a DVB-T2 / T / C2 / C, an ISDB- An RF circuit section for converting the RF signal processed by the frequency processing section into an IF signal; and an IF circuit section which operates when the TV system determined by the frequency processing section is analog, And demodulates the IF signal from the RF circuit unit into a TS signal according to a digital TV decoding method determined by the frequency processor, A digital TV tuner including a digital FEC decoder,
The frequency processing unit includes:
A broadband LNA (Low Noise Amplifier) that eliminates noise by using a common source amplifier, a common gate amplifier, and a current mirror based combine network. );
An RF AGC (Automatic Gain Controller) for supplying a constant level of input power to the wideband LNA through broadband peak rectification detection and adjusting a gain of the wideband LNA with respect to an impedance value matching the corresponding frequency band of the wideband LNA;
An RX band pass filter (RX BPF) that removes unwanted waves included in the amplified signal from the wideband LNA and passes a desired reception frequency with a low loss;
A frequency characteristic of the global broadcasting standard is inputted in the form of a 30x30 array to search for a value most similar to the reception frequency of the RX BPF and to automatically set a channel by confirming the broadcasting system where the current TV is located, And a look-up table (LUT) for automatically selecting a channel of a region where the TV is installed for a non-standard TV broadcast signal to be monitored.

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