KR101365698B1 - Low and high band frequency diplexer on the coaxial cable - Google Patents

Abstract

In the present invention, a separating properties of the high-band signal to obtain a signal that can be made to maximize transmission efficiency on the low-high frequency coaxial line separator is disclosed. A frequency separator according to the present invention comprises a bandpass filter (BPF) that enables a high-frequency signal to be passed through a high-pass filter (HPF) and a high terminal, a signal delay circuit that can delay an output signal of the bandpass filter, a band rejection filter (BRF) which only allows the signals other than the high signals between the HPF and high terminal to be passed through, an inverting circuit that inverts the output signals of a band rejection filter, a parallel frequency converter which is connected to an output terminal of the inverting circuit so as to balance and correct the distortion of a signal, and a mixer which mixes the output signal of the parallel frequency converter and the output signal of the signal delay circuit and provides them to the high terminal. Accordingly, the present invention may remove the noise from the output signal of the bandpass filter which also provides a maximizing effect for a signal transmitting efficiency by achieving a separation characteristic of a high signal. Further, the output stage of the high pass filter can connect the bandpass filter and the band rejection filter in parallel, so that it may bring stability of the circuit by connecting the parallel frequency converter to the output terminal of the band rejection filter. [Reference numerals] (210) High frequency terminal; (275) Parallel frequency converter; (277) Signal delaying circuit; (279) Mixer

Description

LOW AND HIGH BAND FREQUENCY DIPLEXER ON THE COAXIAL CABLE}

The present invention relates to a low-frequency frequency separator on a coaxial line. More specifically, a band pass filter and a band reject filter are connected in parallel to an output terminal of a high pass filter, and a balanced frequency converter is connected to an output terminal of a band reject filter. In addition, the present invention relates to a low frequency divider on a coaxial line capable of securing separation characteristics of a low pass signal and a high pass signal by a band pass filter by removing noise of an output signal of a band pass filter.

In general, in homes, broadcast signals distributed from the satellite antenna or cable operator to the home via coaxial lines are connected to the set-top box or TV, and recently, various technologies for providing wired / wireless home networking using the coaxial lines are provided. Is being proposed.

As a representative example, a method of interfacing a wired network based on a coaxial line with an ultra wide band (UWB) wireless network for a home video network is disclosed. In the attached patent document, there is shown a configuration for separating the UWB signal and the coaxial line signal, which will be described below with reference to FIG. 1.

As shown, the stacked chip diplexer 10 for separating the UWB signal and the coaxial line signal is connected between the first terminal portion 20, the second terminal portion 30, and the third terminal portion 40. Here, the first terminal unit 20 is connected to the coaxial line and receives a coaxial line signal, which is a service signal, or transmits and receives a UWB signal. The second terminal unit 30 transmits the coaxial line signal received through the first terminal unit 20, and the third terminal unit 40 transmits or approaches the UWB signal received through the first terminal unit 20. Receive the UWB signal.

The stacked chip diplexer 10 for separating the UWB signal and the coaxial line signal includes a matching circuit 11, a low pass filter 12, and a high pass filter 13. The matching circuit 11 includes a first capacitor C1 connected in parallel between the first terminal portion 20, the low pass filter 12, and the high pass filter 13, and has a frequency of different bands, that is, a coaxial line signal. Ensure frequency matching between and UWB signal.

The low pass filter 12 is connected between the matching circuit 11 and the second terminal portion 30 to pass a low frequency signal, that is, a coaxial line signal, received through the first terminal portion 20. Specifically, one end of the low pass filter 12 is connected to the connection point of the first terminal portion 20 and the first capacitor C1, and the other end thereof is the second terminal portion 30, and the first inductor L1 And a second inductor L2, a third inductor L3, and a second capacitor C2.

One end of the first inductor L1 is connected to a connection point of the first terminal portion 20 and the first capacitor C1, and the other end thereof is connected to one end of the second inductor L2. The other end of the second inductor L2 is connected to the second terminal unit 30. In addition, one end of the third inductor L3 is connected between the connection point of the first inductor L1 and the second inductor L2, and the other end thereof is connected to the ground terminal through the second capacitor C2.

According to such a configuration, the low pass filter 12 has a parallel resonator and a series resonator. That is, the first inductor L1 and the second inductor L2 connected to each other in series constitute a parallel resonator with the second capacitor C2, and the third inductor L3 forms a series resonator with the second capacitor C2. Done. The high pass filter 13 is connected between the matching circuit 11 and the third terminal portion 40 to pass a high frequency signal, ie, a UWB signal, received through the first terminal portion 20 or to the third terminal portion 40. It passes through the high-frequency signal received through the UWB signal and serves to deliver to the matching unit (11). Here, the high pass filter 13 includes a third capacitor C3, a fourth inductor L4, a fifth inductor L5, a sixth inductor L6, a seventh inductor L7, and an eighth inductor L8. It consists of.

One end of the third capacitor C3 is connected to the first capacitor C1, and the other end thereof is connected to the third terminal portion 40. One end of the fourth inductor L4 is connected to the connection point of the first capacitor C1 and the third capacitor C3, and the other end thereof is connected to one end of the fifth inductor L5. In addition, one end of the seventh inductor L7 is connected to the connection point of the third capacitor C3 and the third terminal portion 40.

The other end is connected to the eighth inductor L8. In addition, the fifth inductor L5 and the eighth inductor L8 are connected to each other in series. One end of the sixth inductor L6 is connected to the connection point of the fifth inductor L5 and the eighth inductor L8, and the other end thereof is connected to the ground terminal.

In this way, in order to connect the UWB signal to the coaxial line in the home environment, a switch is provided between the access point, the antenna for the wireless LAN, and the splitter of the coaxial line, and the UWB signal is wirelessly transmitted to the antenna due to the simple operation of the switch. Or the UWB signal is transmitted as it is on the coaxial line.

However, the conventional technique of separating signals by using a splitter coupled to a coaxial line has less interference between signals when using the same band, but the frequency of the band much higher than that of the UWB signal used in the coaxial line. Since the transmission loss of the UWB signal increases, the possibility of interference between the coaxial line signal and the UWB signal is high.

1. Republic of Korea Patent Registration 10-1132733, Registered Date March 27, 2012, Name of the invention 'Multilayer Chip Diplexer for Separation of ＵＷＢ Signal and Coaxial Line Signal'

The present invention has been made to solve the above problems, and an object of the present invention is to remove noise of the output signal of the bandpass filter, to secure the separation characteristics of the high-frequency signal to maximize the signal transmission efficiency of the coaxial line It is to provide a low frequency separator of the phase.

Another object of the present invention is to connect a band pass filter and a band reject filter in parallel to the output of the high pass filter, and to connect a balanced frequency converter to the output of the band reject filter, thereby providing a low pass signal and a high pass signal by the band pass filter. It is to provide a low frequency separator on the coaxial line which can stably separate the signal.

According to an aspect of the present invention for achieving the above object, the low frequency separator on the coaxial line, the low frequency separator on the coaxial line is provided between the mixing terminal and the low frequency terminal to block the high frequency signal and at the same time pass only the low frequency signal A low pass frequency separator comprising a low pass filter (LPF) and a high pass filter (HPF) which is provided between a mixing terminal and a high pass terminal to block a low pass signal and simultaneously passes only a high pass signal. A band pass filter (BPF) for passing a high pass signal between the filter (HPF) and the high pass terminal; A signal delay circuit for delaying an output signal of the band pass filter; A band reject filter (BRF) for passing only a band signal other than a high band signal between the high pass filter (HPF) and the high band terminal; An inversion circuit for inverting the output signal of the band rejection filter; A balanced frequency converter connected to an output terminal of the inverting circuit to cancel-compensate distortion of the signal; And a mixer for mixing the output signal of the balanced frequency converter and the output signal of the signal delay circuit to provide the high frequency terminal.

According to a preferred embodiment of the present invention, the low pass filter applied to the low frequency divider on the coaxial line passes a low frequency signal of 5-6 MHz frequency band of CCTV or 50-870 MHz frequency band of CATV; The high pass filter is characterized in that the high pass signal of the 1.7 kHz frequency band of the PCS or the high pass signal of the 2 kHz frequency band of WCDMA.

In addition, the signal delay circuit according to a preferred embodiment of the present invention corresponds to a signal delay provided through the band rejection filter, an inverting circuit, and a balanced frequency converter as a signal delay with respect to an analog signal. ㎲ a delay is made.

The low frequency divider on the coaxial line proposed by the present invention removes the noise of the output signal of the bandpass filter, thereby securing the separation characteristics of the high frequency signal, thereby providing an effect of maximizing signal transmission efficiency. In addition, a bandpass filter and a band rejection filter are connected in parallel to the output of the high pass filter, and a balanced frequency converter is connected to the output of the band reject filter to provide stability of the circuit.

1 is a configuration diagram illustrating a diplexer for separation of a conventional coaxial line signal.
Figure 2 is a block diagram for explaining the structure of a low-frequency frequency separator on a coaxial line according to the present invention.
FIG. 3 is a block diagram for explaining the main function of FIG.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

2 is a structural diagram showing a low frequency divider on a coaxial line according to the present invention. The present invention is designed to freely transmit a low pass signal and a high pass signal through a low pass frequency separator on a coaxial line, as shown in FIG. 2, a high pass terminal 210 for transmitting a high pass signal, and a low pass for transmitting a low pass signal. The terminal 220 includes a mixing terminal 230 for transmitting a mixing signal of a high frequency signal and a low frequency signal, and a noise removing unit 280 for removing noise of the high frequency signal after separation of the low frequency signal and the high frequency signal.

Here, a 50 Ω coaxial cable, that is, a high frequency line, is connected to the high frequency terminal 210, and a 75 Ω coaxial cable, that is, a low frequency line, is connected to the low frequency terminal 220.

Meanwhile, as shown in FIG. 3, the low frequency divider on the coaxial line according to the present invention is provided between the mixing terminal 230 and the low frequency terminal 220 to block the high frequency signal and simultaneously pass only the low frequency signal. And a high pass filter (HPF) 250 provided between the mixing terminal 230 and the high frequency terminal 210 to block the low frequency signal and to pass only the high frequency signal at the same time. A band pass filter (BPF) 260 for passing a high frequency signal in the 1.7 to 2.2 GHz band between the high pass filter (HPF) 250 and the high frequency terminal 210 and a delayed output signal of the band pass filter 260; A band rejection filter (BRF: 260) which allows only a signal other than a high frequency signal of a 1.7 to 2.2 GHz band to pass between the signal delay circuit 277 and the high pass filter (HPF) 250 and the high frequency terminal 210. And inverting the output signal of the band rejection filter 260. The inverting circuit 273, a balanced frequency converter 275 connected to an output terminal of the inverting circuit 273 to compensate for distortion of the signal, an output signal of the balanced frequency converter 275, and the signal delay circuit ( And a mixer 279 for mixing the output signals of the 277 and providing them to the high frequency terminal 210.

The signal delay circuit 277 corresponds to a signal delay provided through the band rejection filter 270, the inversion circuit 273, and the balanced frequency converter 275 as a signal delay with respect to an analog signal. A delay of 10 ms is preferred. The signal delay circuit 277 may be a BBD (bucket brigade device) device composed of a MOS field effect transistor and a capacitive capacitor.

In addition, the band rejection filter 270 passes a signal from which a high frequency signal of a specific frequency band, that is, a 1.7 to 2.2 kHz band is removed, and according to the present invention, a notch filter capable of implementing a similar function is provided. Could be used. The inversion circuit 273 is a signal inversion circuit composed of transistors, and the balanced frequency converter 275 is a circuit to which non-linear elements are connected to cancel or correct distortion or distortion of a signal.

Here, the low pass filter 240 applied to the low frequency divider on the coaxial line in accordance with the present invention is to pass the low frequency signal of the 5 ~ 6MHz frequency band of CCTV or 50 ~ 870MHz frequency band of CATV In addition, it is preferable that the high pass filter 250 can pass a high frequency signal in the 1.7 GHz frequency band of the PCS or a high frequency signal in the 2 kHz frequency band of the WCDMA.

By such a configuration, the mixing terminal 230 and the high frequency terminal 210 of the PCS high frequency signal of the 1.7 kHz frequency band or the WCDMA high frequency signal of the 2 kHz frequency band through the high pass filter 250 and the band pass filter 260. The mixing terminal 230 and the low frequency terminal 220 may enable transmission between each other, and the low frequency signal of the 5 to 6 MHz frequency band or the low frequency signal of the CATV to the 50 to 870 MHz frequency band through the low pass filter 240. It is possible to transmit to each other it is possible to provide a high-quality low-band signal and a high-band signal to the apartment house or building and underground.

Hereinafter, the operation of the present invention will be described.

As described above, the frequency divider according to the present invention passes a low pass signal only through the low pass filter 40 between the mixing terminal 230 and the low pass terminal 220 and a signal of a corresponding band is passed to the low pass terminal 220. Supplied. In addition, the high pass filter 250 blocks the low pass signal between the mixing terminal 30 and the high pass terminal 10 and simultaneously passes only the high pass signal.

Since the band pass filter 260 and the band reject filter 270 are connected in parallel to the output terminal of the high pass filter 250, the high pass signal of the band pass filter 260 passes through a high frequency signal of 1.7 to 2.2 GHz. Then, the band rejection filter 270 passes a signal from which the 1.7 to 2.2 GHz band is excluded.

Here, as the inversion circuit 273 is connected to the output terminal of the band rejection filter 270, the output signal of the band rejection filter 270 is provided as an inverted signal. In addition, as the parallel frequency converter 275 is connected to the output terminal of the inverting circuit 273, the distortion state or distortion state of the signal excluding the 1.7 to 2.2 GHz band is canceled or corrected. The parallel frequency converter 275 has a circuit formed by connecting two non-linear elements of the modification, and corrects a signal output from the inversion circuit 273.

On the other hand, the band rejection filter 270, the inverting circuit 273 and the parallel frequency converter 275 is composed of analog devices, the delay of the signal occurs, depending on the characteristics and circuit of the device may be slightly different, but approximately 8 Has a signal delay of ㎲ to 10㎲. Accordingly, the mutual delay time between the output signal of the band pass filter 260 and the output signal of the balanced frequency converter 275 is about 8 ms to about 10 ms.

Therefore, in the present invention, the signal delay circuit 277 is connected to the output terminal of the band pass filter 260, and the signal delay circuit 277 receives signals of the 1.7 to 2.2 GHz band output from the band pass filter 260. Delay for 8 ms to 10 ms. The signal delay is for matching the synchronization time between the output signal of the balanced frequency converter 275 and the output signal of the band pass filter 260, and the delay time can be accurately set by adjusting the capacitor capacity in the circuit.

Thereafter, the signals output from the signal delay circuit 277 and the balanced frequency converter 275 are synthesized through the mixer 279, and the inverted signal and the band pass filter 260 of the signal output from the band rejection filter 270 are then synthesized. ) Are combined to remove noise signals other than signals in the 1.7 to 2.2 GHz band of the band pass filter 260. That is, a 1.7 to 2.2 GHz band signal output from the band pass filter 260 and a signal other than the 1.7 to 2.2 GHz band as an inverted signal of the band rejection filter 270 are synthesized to produce a 1.7 to 2.2 GHz band without noise. Only the signal of the high frequency terminal 210 is to be provided.

As a result, by connecting the band pass filter 260 and the band rejection filter 270 in parallel, it is possible to transmit a high frequency signal without noise, thereby improving the quality of the product as well as to the band pass filter 260. It is possible to minimize the deterioration of the characteristics of the line due to the impedance mismatch and the effect on other component elements by securing the isolation characteristics of the low and high frequency signals. Minimization can be guaranteed.

210: high terminal 220: low terminal
230: mixing terminal 240: low pass filter
250: high pass filter 260: band pass filter
270: band rejection filter 273: inversion circuit
275 balanced frequency converter 277 signal delay circuit
279: Blender

Claims (5)

The low frequency divider on the coaxial line has a low pass filter (LPF) which is provided between the mixing terminal and the low frequency terminal to block the high frequency signal and passes only the low frequency signal, and is provided between the mixing terminal and the high frequency terminal and is low frequency signal. In the low frequency divider including a high pass filter (HPF) to pass the high-pass signal at the same time blocking the,
A band pass filter (BPF) for passing a high pass signal between the high pass filter (HPF) and the high pass terminal;
A signal delay circuit for delaying an output signal of the band pass filter;
A band reject filter (BRF) for passing only a band signal other than a high band signal between the high pass filter (HPF) and the high band terminal;
An inversion circuit for inverting the output signal of the band rejection filter;
A balanced frequency converter connected to an output terminal of the inverting circuit to cancel-compensate distortion of the signal; And
And a mixer for mixing the output signal of the balanced frequency converter and the output signal of the signal delay circuit to provide the high frequency terminal to the high frequency terminal. The method of claim 1,
A low pass filter applied to the low frequency divider on the coaxial line passes a low frequency signal of 5 to 6 MHz frequency band of CCTV or a low frequency signal of 50 to 870 MHz frequency band of CATV;
The high pass filter is a low pass frequency separator on a coaxial line, characterized in that the high pass signal of the 1.7 kHz frequency band of the PCS or the 2 kHz frequency band of the WCDMA pass. The method of claim 1,
The signal delay circuit corresponds to a signal delay provided through the band rejection filter, the inverting circuit, and the balanced frequency converter as a signal delay with respect to the analog signal, and has a delay of 8 kHz to 10 kHz on the coaxial line. Low frequency separator. The method of claim 3, wherein
And the signal delay circuit is a bucket brigade device (BBD) device comprising a MOS type field effect transistor and a capacitance capacitor. 5. The method according to any one of claims 1 to 4,
A 50 ohm coaxial cable is connected to the high frequency terminal;
And a 75Ω coaxial cable connected to the low frequency terminal.

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