KR100799850B1 - Dual band tuner module - Google Patents

Abstract

The present invention relates to a dual-band tuner module that can improve the strong electric field interference characteristics, miniaturization and cost reduction.

The present invention provides one of a first protection circuit connected to a first signal input terminal, a second protection circuit connected to a second signal input terminal, and a signal from the first signal input terminal and a signal from the second signal input terminal. Switching unit to select and supply; A dual band comprising a low noise amplifier for amplifying and supplying a signal supplied from the switching unit and a tuner unit for converting and supplying an RF signal of a frequency corresponding to a selected channel into an IF signal, and manufactured in one package. Provide a tuner module.

According to the present invention, the strong electric field interference characteristics are improved, which is advantageous in miniaturization and cost reduction, and it is possible to reduce signal loss.

Tuner, Dual Band

Description

Dual Band Tuner Module {DUAL BAND TUNER MODULE}

1 is a block diagram of a dual band tuner according to the prior art.

2 is a block diagram of a dual band tuner module according to the present invention

3A is a configuration diagram of a first protection circuit of FIG. 2.

3B is a configuration diagram of the second protection circuit of FIG. 2.

4 is a configuration diagram of the low noise amplifier of FIG.

<Explanation of symbols for the main parts of the drawings>

100: dual band tuner module 110: first protection circuit

120: second protection circuit 111: first surge protection device

112: first capacitor 113: first resistor

114: second capacitor 121: second surge protection element

122: third capacitor 123: second resistor

124: fourth capacitor 130: switching unit

140: low noise amplifier 141: low noise amplifier

142: switch 150: tuner portion

160: demodulation

The present invention relates to a dual band tuner module, and more particularly, to a dual band tuner module capable of improving the strong electric field interference characteristics, miniaturization and cost reduction.

In general, a TV set or a set-top box (STB) may employ a terrestrial tuner that receives terrestrial TV broadcasts or a cable tuner that receives cable TV broadcasts. Dual band tuners are available that can receive everything.

Each TV broadcast received through the dual band tuner is received for viewing and output through a separate TV screen.

Such a conventional dual band tuner will be described with reference to FIG. 1.

1 is a block diagram of a dual band tuner according to the prior art.

The dual band tuner according to the related art shown in FIG. 1 includes a first capacitor 11 having one end connected to a first antenna ANT1 and blocking a DC component among terrestrial signals received through the first antenna ANT1. And a first diode 13 connected between the other end of the first capacitor 11 and the ground to bypass an overvoltage applied through the first capacitor 11 to ground, and a second antenna ANT2. One end is connected between the second capacitor 12 and the other end of the second capacitor 12 and the second capacitor 12 which cuts the DC component of the cable signal received through the second antenna ANT2 and the second capacitor ( A second diode 14 for bypassing the overvoltage applied through 12 to ground, and one of the terrestrial signal passing through the first capacitor 11 and the cable signal passing through the second capacitor 12. Switching unit 15 for selecting and supplying the, A switching module 10 having a low noise amplifier 16 for amplifying and supplying a selected signal, and receiving a signal amplified by the low noise amplifier 16 converts a frequency band corresponding to a selected channel into an IF signal. And a tuner module 20 having a tuner portion 21.

These switching modules and tuner modules are manufactured as separate individual modules.

However, when a signal of a strong electric field is introduced from the first antenna ANT1 or the second antenna ANT2, the first diode 13 and the second diode 14 are floated, and the first antenna ( There is a problem in that the strong electric field interference characteristics of the signals received from the ANT1 and the second antenna ANT2 are deteriorated.

In addition, as described above, in the conventional dual band tuner, since the switching module and the tuner module are manufactured as separate modules, there is a limit in miniaturization of the device applied to the dual band tuner, and there is a problem in that the manufacturing cost is increased. .

In addition, the signal splitter and the tuner are manufactured as separate modules, respectively, and are individually mounted, so that the signal is lost due to the coaxial cable.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-described problems of the prior art, and an object thereof is to provide a dual band tuner module applied to a dual band receiver such as a television set or a set top box. It is an object of the present invention to provide a dual band tuner module which is advantageous and can improve reception performance.

In order to achieve the above technical problem, the present invention includes a first surge protection device connected to a first signal input terminal and a first bias power source to bypass a surge input from the first signal input terminal to ground. A first protection circuit configured to output a biased first broadcast signal; A second protection connected to a second signal input terminal and a second bias power source, the second surge protection device bypassing a surge input from the second signal input terminal to ground and outputting a biased second broadcast signal; Circuit; A switching unit which selects one of the first broadcast signal and the second broadcast signal according to a switching signal from an external source and outputs the selected broadcast signal as a third broadcast signal; A low noise amplifier for low noise amplifying the third broadcast signal; And a tuner unit for converting an RF signal of a frequency corresponding to a selected channel among the third broadcast signals amplified by the low noise amplifier into an IF signal, and is manufactured in one package. .

The first protection circuit has a first end connected to the first signal input terminal and the other end connected to the first bias power supply to block a DC component input from the first signal input terminal and the first bias power supply. Capacitors; A first surge protection device having one end connected to the other end of the first capacitor and the other end connected to the ground; And a second capacitor having one end connected to the other end of the first capacitor and the first bias power supply, and blocking a DC component input from the first bias power supply to output the first broadcast signal at the other end. It is done.

The first surge protection device is a first diode having a cathode connected to the other end of the first capacitor and an anode connected to ground.

The first protection circuit is connected between the first bias power supply and the other end of the first capacitor to prevent the signal from the first signal input terminal passing through the first capacitor from being transmitted to the first bias power supply. It characterized in that it further comprises a first resistor.

The second protection circuit has one end connected to the second signal input terminal and the other end connected to the second bias power supply to block a DC component input from the second signal input terminal and the second bias power supply. Capacitors; A second surge protection device having one end connected to the other end of the third capacitor and the other end connected to the ground; And a fourth capacitor having one end connected to the other end of the third capacitor and the second bias power source, and blocking a DC component input from the second bias power source to output the second broadcast signal at the other end. It is done.

The second surge protection device is a second diode having a cathode connected to the other end of the third capacitor and an anode connected to ground.

The second protection circuit is connected between the second bias power supply and the other end of the third capacitor to prevent the signal from the second signal input terminal passing through the third capacitor from being transmitted to the second bias power supply. It characterized in that it further comprises a second resistor.

The low noise amplifier comprises: a low noise amplifier for low noise amplifying the third broadcast signal; And a switch connected to an input terminal and an output terminal of the low noise amplifier and configured to switch according to an external switching signal based on an electric field of the selection signal.

And demodulating the IF signal from the tuner according to a preset demodulation scheme.

Hereinafter, various embodiments of the present invention will be described in more detail with reference to the accompanying drawings. Components having substantially the same configuration and function in the drawings will use the same reference numerals.

2 is a block diagram of a dual band tuner module according to the present invention.

As shown in FIG. 2, the dual band tuner module 100 according to the present invention includes a first protection circuit 110 and a second protection circuit 120, a switching unit 130, a low noise amplifier 140, The tuner unit 150 and the demodulator 160 are manufactured in one package.

The first protection circuit 110 is connected to a first signal input terminal ANT1 and a first bias power supply V1 to bypass a surge input from the first signal input terminal ANT1 to ground. The surge protection device 111 is provided, and the biased first broadcast signal is output. The second protection circuit 120 is connected to the second signal input terminal ANT2 and the second bias power supply V2 to bypass the surge input from the second signal input terminal ANT2 to ground. A surge protection device 121 is provided, and the biased second broadcast signal is output.

The switching unit 130 selects one of the first broadcast signal and the second broadcast signal by a switching signal from the outside, outputs the selected broadcast signal as a third broadcast signal, and the low noise amplifier 140 Low noise amplifies the selection signal from the third broadcast signal.

The tuner 150 converts an RF signal of a frequency corresponding to a selected channel among the signals amplified by the low noise amplifier 140 into an IF signal, and provides the demodulator 160 with the tuner 150. Demodulates the IF signal supplied from A according to the preset demodulation method.

3A is a configuration diagram of the first protection circuit of FIG. 2, and FIG. 3B is a configuration diagram of the second protection circuit of FIG. 2.

Referring to FIG. 3A, one end of the first protection circuit 110 is connected to the first signal input terminal ANT1, and the other end of the first protection circuit 110 is connected to the first bias power supply V1, thereby providing the first signal input terminal ANT1. And a first surge protection device having one end connected to the other end of the first capacitor 112 and the other end of the first capacitor 112 that blocks the DC component input from the first bias power supply V1, and the other end connected to the ground. 111 and one end connected to the other end of the first capacitor 112 and the first bias power source V1 and cut off a DC component input to the first bias power source V1 to cut the first broadcast signal from the other end. And a second capacitor 114 for outputting. The first surge protection device 111 may be a first diode 111 having a cathode connected to the other end of the first capacitor 112 and an anode connected to ground.

In addition, a signal from the first signal input terminal ANT1 connected between the first bias power supply V1 and the other end of the first capacitor 112 to pass through the first capacitor 112 is connected to the first signal. It may further include a first resistor 113 to prevent the transfer to the bias power supply (V1).

Referring to FIG. 3B, one end of the second protection circuit 120 is connected to the second signal input terminal ANT2 and the other end of the second protection input terminal ANT2 is connected to the second signal input terminal ANT2. And a second surge protection device having one end connected to the other end of the third capacitor 122 and the third capacitor 122 to block the DC component input from the second bias power source V2, and the other end connected to the ground. 121) one end of the third capacitor 122 and the other end of the third capacitor 122 are connected to the second bias power source V2, and a DC component input to the second bias power source V2 is cut off so that the second broadcast signal is received at the other end. And a fourth capacitor 124 for outputting. The second surge protection device 121 may be a second diode 11 having a cathode connected to the other end of the third capacitor 122 and an anode connected to ground.

In addition, a signal from the second signal input terminal ANT2 connected between the second bias power supply V2 and the other end of the second capacitor 122 to pass through the second capacitor 122 is connected to the second terminal. A second resistor 123 may be further prevented from being transferred to the bias power supply V2.

4 is a configuration diagram of the low noise amplifier of FIG. 2.

As shown in FIG. 4, the low noise amplifier 140 of FIG. 2 includes a low noise amplifier 141 for low noise amplifying a third broadcast signal of the switching unit 130, and an input terminal and an output terminal of the low noise amplifier 141. It is connected to, and comprises a switch 142 for switching in accordance with an external switching signal based on the electric field of the third signal.

Hereinafter, the operation and effects of the dual band tuner module according to the present invention will be described with reference to the accompanying drawings.

Referring to FIG. 2, a signal received through the first signal input terminal ANT1 is output as a first broadcast signal from the first protection circuit 110, and when a surge is input from the first signal input terminal ANT1. Surge is bypassed to ground by the first surge protection device 111 of the first protection circuit 110. In addition, the first broadcast signal is biased by the first bias power source V1 and output.

Similarly, the signal received through the second signal input terminal ANT2 is output as the second broadcast signal from the second protection circuit 120. When the surge is input from the second signal input terminal ANT2, the surge is generated. The second surge protection device 121 of the second protection circuit 120 is bypassed to the ground. In addition, the second broadcast signal is biased by the second bias power source V2 and output.

A first high pass filter between the first signal input terminal ANT1 and the first protection circuit 110 to remove a signal having a frequency lower than a predetermined frequency among the signals input from the first signal input terminal ANT1; And a lower frequency than a predetermined frequency among signals input from the second signal input terminal ANT2 between the second signal input terminal ANT2 and the second protection circuit 120. A second high pass filter (not shown) may be further included to remove the signal. In this case, a signal passing through the first high pass filter (not shown) is supplied to the first protection circuit 110, and a signal passing through the second high pass filter (not shown) passes through the second protection circuit. Supplied to 120.

The operation of the first protection circuit 110 and the second protection circuit 120 will be described in more detail with reference to FIGS. 3A and 3B.

When a surge is applied from the outside through the first signal input terminal ANT1, the surge is bypassed toward the ground by the first surge protection device 111 connected to the first capacitor 112. The DC component among the signals received through the first signal input terminal ANT1 is cut off at the first capacitor 112, and the signal through the first signal input terminal ANT1 from which the DC signal is cut off is transmitted to the first capacitor 112. And a first broadcast signal through the second capacitor 114.

In addition, when a surge is applied from the outside through the second signal input terminal ANT2, the surge is bypassed toward the ground by the second surge protection device 121 connected to the third capacitor 122. The DC component among the signals received through the second signal input terminal ANT2 is blocked by the third capacitor 122, and the signal through the second signal input terminal ANT2 from which the DC signal is blocked is transferred to the third capacitor 122. And a second broadcast signal through the fourth capacitor 124.

As such, the first protection circuit 110 and the second protection circuit 120 may protect the dual band tuner module according to the present invention from an external surge.

The first surge protection device 111 and the second surge protection device 121 may be diodes connected to a cathode connected to the first capacitor 112 and the third capacitor 122 and to a ground. The diode is turned on in the reverse direction only when a surge is input to bypass the surge to ground.

However, as described above, when a strong electric field signal is input to the first signal input terminal ANT1 and the second signal input terminal ANT2, the first broadcast signal and the second broadcast signal are floating. Occurs and the strong electric field interference characteristics are inferior.

In order to prevent this, a first bias power supply V1 is supplied as a bias voltage to a connection terminal of the first capacitor 112 and the first surge protection device 111 of the first protection circuit 110. A second bias power supply V2 is supplied as a bias voltage to a connection terminal of the third capacitor 122 and the second surge protection element 121 of the second protection circuit 120 to supply the first broadcast signal and the first broadcast signal. 2 The floating phenomenon can be reduced by biasing the broadcast signal.

In addition, the DC component of the first bias power supply V1 is cut off by the first capacitor 112 and the second capacitor 114, and the DC component of the second bias power supply V2 is blocked by the third capacitor. Blocked by the 122 and the fourth capacitor 124 can reduce the influence on the other elements by the bias power (V1, V2).

In addition, the first resistor 113 prevents the signal from the first signal input terminal ANT1 from being transmitted to the first bias power supply V1 so that the signal through the first signal input terminal ANT1 is switched to the switching unit ( 130 is supplied without loss, and the second resistor 123 prevents a signal from the second signal input terminal ANT2 from being transmitted to the second bias power supply V2 to prevent the signal from being transmitted to the second bias power supply V2. The signal through) is supplied to the switching unit 130 without loss.

As such, the bias voltage is applied by the first bias power supply V1 and the second bias power supply V2 to suppress the floating phenomenon of the first broadcast signal and the second broadcast signal, thereby suppressing the strong electric field signal. There is an effect of improving the crosstalk characteristics.

Referring back to FIG. 2, the first broadcast signal and the second broadcast signal are selected by the switching unit 130 operating by a switching signal from the outside. The selection signal selected by the switching unit 130 is supplied to the low noise amplifier 140. The selection signal is low noise amplified by the low noise amplifier 140 and output to the tuner 150.

An operation of the low noise amplifier 140 will be described in detail with reference to FIG. 4.

Referring to FIG. 4, when the low noise amplifier 140 includes a low voltage amplifier 141 and a switch 142, the low voltage amplifier 141 low noise a third broadcast signal from the switching unit 130. Amplify. In addition, the switch 142 performs a switching operation according to an external switching signal SW based on the received electric field of the third broadcast signal.

The switching signal SW may be provided by the demodulator 160 or a controller (not shown) based on the received electric field of the third broadcast signal. For example, when the third broadcast signal corresponds to a strong electric field, the switch 142 is turned on by the switching signal SW, so that the low noise amplifier 140 amplifies the third broadcast signal without amplification. Bypass it. On the contrary, when the third broadcast signal corresponds to the weak electric field, the switch 142 is turned off by the switching signal SW, so that the low noise amplifier 140 converts the third broadcast signal to the low noise amplifier. Low noise amplification at 141) is provided to the next stage.

Referring back to FIG. 2, the tuner 150 converts an RF signal of a frequency corresponding to a selected channel among the signals from the low noise amplifier 140 into an IF signal.

As described above, the dual band tuner module according to the present invention includes one switching unit for selecting a received signal from the first signal input terminal and the second signal input terminal, and a tuner unit for outputting an IF signal from the signal of the switching unit. Since it is manufactured as a package, it is advantageous in miniaturization and cost reduction of the product.

In addition, the dual band tuner module according to the present invention may further include a demodulator 160 for demodulating the IF signal according to a preset demodulation scheme. If the demodulator is embedded in a dual band tuner module, there is an additional miniaturization and cost reduction effect.

In the dual band tuner according to the related art, the switching module 10 and the tuner module 20 of FIG. 1 are manufactured as separate modules, and the switching module 10 and the tuner module 20 are coaxial cables in a television set. Was connected. The coaxial cable induces a loss in the signal supplied from the low noise amplification part to the tuner part. However, in the present invention, the switching module and the tuner module are embedded in one package and connected by means such as a circuit pattern on a board, thus eliminating the need for a coaxial cable as in the prior art, thus reducing the loss of the signal supplied to the tuner portion. It can be effective.

The present invention is not limited by the above-described embodiment and the accompanying drawings, but by the appended claims. Therefore, it will be apparent to those skilled in the art that various forms of substitution, modification, and alteration are possible without departing from the technical spirit of the present invention described in the claims, and the appended claims. Will belong to the technical spirit described in.

As described above, according to the present invention, the floating phenomenon of the diode is suppressed, so that the strong electric field interference characteristics of signals input from a signal input terminal such as an antenna are improved.

In addition, since the switching unit and the tuner unit for selecting one of the signals input from the signal input terminal are integrated into one package, there is an effect of miniaturization and cost reduction of the product.

The coaxial cable connecting the switching unit and the tuner unit can be removed, thereby reducing the signal loss caused by the coaxial cable.

Claims (9)

A first surge protection device connected to a first signal input terminal and a first bias power supply for bypassing a surge input from the first signal input terminal to ground, the first biased by the first bias power supply; A first protection circuit which outputs a broadcast signal; A second surge protection device connected to a second signal input terminal and a second bias power supply for bypassing a surge input from the second signal input terminal to ground, the second biased by the second bias power supply; A second protection circuit which outputs a broadcast signal; A switching unit which selects one of the first broadcast signal and the second broadcast signal according to a switching signal from an external source and outputs the selected broadcast signal as a third broadcast signal; A low noise amplifier for low noise amplifying the third broadcast signal; And Including a tuner unit for converting the RF signal of the frequency corresponding to the selected channel of the third broadcast signal amplified by the low noise amplifier into an IF signal, Dual band tuner module, characterized in that made in one package. The method of claim 1, wherein the first protection circuit, A first capacitor having one end connected to the first signal input terminal and the other end connected to the first bias power source to block a DC component input from the first signal input terminal and the first bias power source; The first surge protection device having one end connected to the other end of the first capacitor and the other end connected to the ground; And A second capacitor having one end connected to the other end of the first capacitor and the first bias power supply, and blocking a DC component input from the first bias power supply to output the first broadcast signal at the other end; Dual band tuner module comprising a. The method of claim 2, wherein the first surge protection device, And a first diode having a cathode connected to the other end of the first capacitor and an anode connected to ground. The method of claim 2, wherein the first protection circuit, A first resistor connected between the first bias power supply and the other end of the first capacitor to prevent a signal from the first signal input terminal passing through the first capacitor from being transmitted to the first bias power supply; Dual band tuner module characterized in that it further comprises. The method of claim 1, wherein the second protection circuit, A third capacitor having one end connected to the second signal input terminal and the other end connected to the second bias power source to block a DC component input from the second signal input terminal and the second bias power source; The second surge protection device having one end connected to the other end of the third capacitor and the other end connected to the ground; And A fourth capacitor having one end connected to the other end of the third capacitor and the second bias power source, and blocking a DC component input from the second bias power source to output the second broadcast signal at the other end; Dual band tuner module comprising a. The method of claim 5, wherein the second surge protection device, And a second diode having a cathode connected to the other end of the third capacitor and an anode connected to ground. The method of claim 5, wherein the second protection circuit, A second resistor connected between the second bias power supply and the other end of the third capacitor to prevent a signal from the second signal input terminal passing through the third capacitor from being transferred to the second bias power supply; Dual band tuner module characterized in that it further comprises. The method of claim 1, wherein the low noise amplifier, A low noise amplifier for low noise amplifying the third broadcast signal; And A switch connected to an input terminal and an output terminal of the low noise amplifier and switching according to an external switching signal based on an electric field of the selection signal Dual band tuner module comprising a. The method of claim 1, And a demodulator for demodulating the IF signal from the tuner according to a preset demodulation scheme.

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