KR100921986B1 - Slope Circuit Using PIN Diode and Satellite Amplifier Using It - Google Patents

Abstract

PURPOSE: A slope circuit using a pin diode and a phase amplifier using the same are provided to transmit a signal in a high frequency region and a low frequency region uniformly by reducing an attenuation rate in the high frequency region. CONSTITUTION: A slope circuit using a pin diode includes an input terminal(10), an output terminal(60), a control voltage supply unit(20), a voltage controller(30), a slope attenuator(40), and an output impedance matching unit(50). The input terminal receives the high frequency signal. The output terminal outputs the high frequency signal. The control voltage supply unit applies the control voltage. The voltage controller controls the attenuation characteristic of the pin diode by controlling the control voltage. The slope attenuator is comprised of a pin diode and a first resonance circuit. The output impedance matching unit forms an end of the slope attenuator and the common node. The output impedance matching unit matches the impedance of the high frequency signal attenuated in the slope attenuator. The output impedance matching unit additionally compensates the slope compensated in the first resonance circuit and outputs the compensated slope through the output terminal.

Description

Slope circuit using pin diode and satellite amplifier using it

The present invention relates to a slope circuit using a pin diode and a satellite amplifier using the same.

More specifically, the present invention relates to a slope circuit implemented using a junction capacitance of a PIN diode and a resonance circuit, and a satellite amplifier using the same.

According to the digital satellite broadcasting signal receiving path, the 11㎓ ~ 12㎓ microwaves transmitted from the satellite are received by the outdoor down converter, frequency converted into the high frequency signal of about 950MHz ~ 2150MHz band, and then the antenna input terminal of the tuner for the satellite broadcasting receiver. Is entered. The high frequency satellite broadcasting signals of the 950MHz to 2150MHz band inputted to the satellite broadcasting tuner are transformed and demodulated by intermediate frequency at internal mixer stage and demodulation stage, respectively, and are output as baseband digital satellite broadcasting video signal, audio signal and digital data. do.

In this case, in the case of the satellite broadcasting amplifier, the received high frequency band satellite broadcasting signal is transmitted through the coaxial cable in the premises, so that the high frequency band is attenuated due to the characteristics of the cable, so that the reception rate of the high frequency band is decreased. In order to compensate the severe attenuation characteristics of the high frequency band on the coaxial line, it is necessary to adjust the slope characteristics before amplifying and outputting from the satellite amplifier.

The present invention is to implement a slope circuit of a phase amplifier to have a desired slope characteristics before amplification in a phase amplifier in which amplification is performed before transmission through the coaxial line.

Specifically, by lowering the attenuation ratio in the high frequency region of the satellite broadcasting signal passing through the slope circuit, both the high frequency region and the low frequency region are relatively attenuated in the low frequency and high frequency region and then amplified and transmitted through the coaxial line. We want to ensure that even transmission is done in.

More specifically, for this purpose, desired slope characteristics are obtained by using attenuation characteristics according to the junction capacitance of the pin diode and a resonance circuit connected in parallel with the pin diode.

In addition, an object thereof is to provide a slope circuit using a pin diode and a resonant circuit and a satellite amplifier including the slope circuit.

In order to achieve the above object, a slope circuit using a pin diode, used in the satellite amplifier according to one aspect of the present invention includes: an input terminal for receiving a high frequency signal and an output terminal for outputting a high frequency signal; A control voltage supply unit for applying a control voltage; A voltage controller for controlling attenuation characteristics of the pin diode by adjusting a control voltage applied thereto; It consists of a first resonant circuit part connected in parallel to the pin diode and the pin diode between the input terminal and the output terminal to compensate the slope attenuation characteristics of the pin diode, and the high frequency signal applied from the input terminal according to the control voltage regulated by the voltage regulator. A slope attenuator for adjusting the slope attenuation characteristic so that the attenuation characteristic of the pin diode is close to '0' in a predetermined high frequency band and transmitting the slope attenuation characteristic to the output terminal; An output impedance matching unit forming a common node with an end of the slope attenuation unit and matching an impedance of a high frequency signal attenuated by the slope attenuation unit to be output through an output terminal; It is made, including.

Preferably, according to another aspect of the present invention, in the above-described slope circuit using the pin diode, the first resonant circuit portion is composed of series resonant circuits (C1, L1), the output impedance matching portion in the first resonant circuit portion And a second resonant circuit part for performing additional compensation for the made slope compensation, wherein the second resonant circuit part includes a parallel resonant circuit L3 ∥ C7.

Preferably, in the above-described slope circuit using the pin diode, the first coupling capacitor C4 is provided between the connection node and the input terminal between the slope attenuation portion and the voltage regulating portion, and the slope attenuation portion and the output impedance. A second coupling capacitor C5 is provided between the common node and the output terminal between the matching parts.

Also preferably, according to another aspect of the present invention, in the above-described slope circuit using the pin diode, the first resonant circuit portion and the second resonant circuit portion are characterized in that the resonant characteristics in the 2150MHz band, respectively.

In addition, in order to achieve the above object, a satellite amplifier according to another aspect of the present invention comprises: an amplifier input terminal for receiving a high frequency signal and an amplifier output terminal for outputting the amplified high frequency signal; A slope circuit using a pin diode according to any one of the aspects of the present invention for receiving a high frequency signal applied from an amplifier input and performing slope attenuation and transmitting the attenuated high frequency signal; And an amplifier for amplifying the attenuated high frequency signal transmitted and applied from the slope circuit using the pin diode. It is made, including.

According to a specific aspect of the present invention, a slope circuit generally used in a satellite amplifier is implemented by using a junction capacitance of a PIN diode and a resonant circuit connected in parallel thereto, so that a relatively high frequency region of a satellite broadcast signal input to the satellite amplifier is provided. By lowering the attenuation rate, amplification is carried out to transmit evenly in both the relatively high frequency region and the relatively low frequency region in the process of being amplified and transmitted through the coaxial line. As a result, the slope circuit used for the satellite amplifier is very simple and effective compared to the existing satellite amplifiers.

Hereinafter, an embodiment of the present invention will be described in detail with reference to the accompanying drawings. In the following, the same reference numerals denote the same configurations unless otherwise specified.

1 is a schematic block diagram showing a slope circuit using a pin diode used in a satellite amplifier according to an embodiment of the present invention, Figures 2a and 2b is used in a satellite amplifier according to an embodiment of the present invention Schematic circuit diagrams showing a slope circuit using a pin diode.

1, 2A and 2B, a slope circuit using a pin diode used in a satellite amplifier according to an embodiment of the present invention is an input terminal 10 for receiving a high frequency signal, an output terminal 60 for outputting a high frequency signal , The control voltage supply unit 20 for applying the control voltage, the voltage adjusting unit 30 for adjusting the attenuation characteristics of the pin diode D1 by adjusting the applied control voltage, the slope attenuation unit 40 and the output impedance matching. It comprises a portion 50.

Preferably, referring to FIGS. 2A and 2B, a first coupling capacitor C4 is provided between the connection node and the input terminal 10 between the slope attenuation portion 40 and the voltage regulating portion 30, and the slope attenuation is provided. A second coupling capacitor C5 is provided between the common node between the unit 40 and the output impedance matching unit 50 and the output terminal 60.

2A and 2B, input stage 10 is shown as RFIN and output stage 60 is shown as RFOUT. The control voltage supply 20 is shown as Vc.

As shown in FIGS. 2A and 2B, the voltage regulator 30 includes a volume resistor R3, a decoupling resistor R2, and a bypass capacitor C9. The volume resistor R3 is a variable resistor and is connected to the control voltage Vc to divide the applied control voltage Vc. The decoupling resistor R2 is connected to a connection node of the slope attenuation portion 40 formed of the pin diode D1 and the first resonant circuit portion 42. The bypass capacitor C9 is connected to the node between the volume resistor R3 and the decoupling resistor R2 and grounded to ground. The bypass capacitor C9 emits an AC component of the control voltage Vc supplied from the control voltage supply unit 20 through the ground to remove RF noise and pins the component from which the RF noise is removed through the decoupling resistor R2. It is provided as a connection node between the slope attenuation portion 40 formed of the diode D1 and the first resonant circuit portion 42.

Referring to FIGS. 2A and 2B, the voltage controller 30 adjusts the slope of the slope characteristic curve of the present invention by adjusting the control voltage Vc by adjusting the variable resistor R3, that is, the volume resistor R3. The inclination characteristic of the pin diode D1 is adjusted by adjusting the attenuation characteristic of the pin diode D1 of the unit 40. According to the voltage control by adjusting the volume resistance R3 of the voltage adjusting unit 30, the slope of the slope characteristic curve in the slope circuit using the pin diode of the present invention can be adjusted. Attenuation rate of each satellite band of the satellite broadcast signal may vary according to the inclination according to the adjustment of the voltage adjusting unit 30.

In the present invention, the slope characteristic curve may be obtained by using a pin diode and a resonant circuit connected in parallel thereto. FIG. 3A is a graph showing attenuation characteristics of the pin diode, and FIG. 3B is a graph showing a pin diode according to an embodiment of the present invention. This graph shows the characteristics of the slope circuit implemented using the resonant circuit.

The slope attenuation portion 40 is connected to the pin diode D1 and the pin diode D1 in parallel between the input terminal 10 and the output terminal 60 as shown in FIGS. 2A and 2B to attenuate the pin diode D1. The first resonance circuit part 42 compensates for the characteristic. In the slope attenuation unit 40, the attenuation characteristic of the pin diode D1, i.e., the attenuation degree, of the pin diode D1 is adjusted according to the control voltage Vc adjusted by the voltage adjusting unit 30 for the high frequency signal applied from the input terminal 10. Send to 60.

A pin diode is a diode composed of a P-type semiconductor, an intrinsic semiconductor, and an N-type semiconductor junction, and can be equivalently represented by a model of a variable resistor and a capacitor connected in parallel thereto. The slope characteristic curve can be obtained as shown in FIG. 3A.

As shown in Figs. 2A and 2B, the first resonant circuit portion 42 of the slope attenuation portion 40 is such that the inclination characteristics of the pin diode D1 exhibit the desired slope characteristics as shown in Fig. 3B, i.e., high frequency. It is connected in parallel to the pin diode D1 to form a slope at the end.

The first resonant circuit part 42 is connected in parallel to the pin diode D1 between the input terminal 10 and the output terminal 60. As shown in FIGS. 2A and 2B, the connection node of the pin diode D1 and the first resonant circuit unit 42 is connected to the voltage adjusting unit 30.

According to one preferred embodiment, as shown in Figs. 2A and 2B, the first resonant circuit portion 42 is composed of the series resonant circuits C1 and L1 of the capacitor C1 and the reactor L1. More preferably, the series resonant circuits C1 and L1 have a resonance frequency in the 2150 MHz band. In the present invention, the 2150 MHz band means a frequency band around 2150 MHz, preferably about ± 10% of the range based on 2150 MHz, more preferably 2100 ~ 2200 MHz range. Most preferably, 2150 MHz.

As shown in Figs. 2A and 2B, the attenuation circuit is implemented by the pin diode D1 and the first resonant circuit portion 42 connected in parallel thereto so as to exhibit a desired slope characteristic as shown in Fig. 3B, that is, a low frequency region. In this paper, the slope characteristics with large attenuation width and little attenuation in the high frequency range are formed. As shown in FIGS. 2A and 2B, by connecting the first resonant circuit unit 42 to the pin diode D1 in parallel, as shown in FIG. 3B, the attenuation width is large in the low frequency region, preferably in the 950 MHz region. For example, an attenuation value of about -10 dB is shown, and the slope characteristic is formed so that the attenuation value approaches 0 dB in the high frequency region, preferably around the 2150 MHz band. The slope of the slope characteristic curve shown in FIG. 3B is achieved by adjusting the attenuation characteristic of the pin diode D1 according to the control voltage adjustment.

The output impedance matching part 50 forms a common node with the end of the slope attenuation part 40, as shown in Figs. 2A and 2B. As shown in FIG. 2A, the output impedance matching unit 50 includes an impedance Z for matching the impedance of the attenuated high frequency signal in the slope attenuation unit 40 to match the impedance of the attenuated high frequency signal. Output through the output terminal 60. The impedance Z of the output impedance matching part 50 is connected to the terminal of the slope attenuation part 40, that is, the node of the pin diode D1 and the first resonant circuit part 42 in FIG. 2A to form a common node. The impedance of the high frequency signal outputted to 60 is matched.

In one preferred embodiment, as shown in FIG. 2B, the output impedance matching section 50 performs a second resonance for performing additional compensation for the slope compensation made in the first resonant circuit section 42 after the resistor R1. It can be made by further adding the circuit portion 52. In this case, the second resonant circuit unit 52 has a small attenuation value other than 0 dB in the high frequency band, that is, the 2150 NHz band, for the slope compensation in the first resonant circuit unit 42 connected in parallel to the pin diode D1. Further compensation is performed to compensate for the attenuation value near 0dB or near 2150MHz band as shown in FIG. 3B to have the desired slope characteristics.

As a further preferred embodiment, as shown in Fig. 2b, the second resonant circuit portion 52 of the output impedance matching portion 50 is a parallel resonant circuit L3 ∥ C7 of the capacitor C7 and the reactor L3. Is made of. More preferably, the parallel resonant circuit L3 ∥ C7 is designed to have a resonance frequency in the 2150 MHz band.

According to another exemplary embodiment of the present invention, as shown in FIGS. 2A and 2B, a first coupling capacitor is connected between the input node 10 and the connection node between the slope attenuation portion 40 and the voltage regulating portion 30. C4 is provided to prevent the control voltage Vc from being output through the input terminal 10.

In addition, a second coupling capacitor C5 is provided between the common node between the slope attenuator 40 and the output impedance matching unit 50 and the output terminal 60, and the second coupling capacitor C5 has an output terminal. At 60, the DC component of the control voltage Vc is blocked.

Next, a phase amplifier according to another aspect of the present invention will be described.

4 is a schematic block diagram of a satellite amplifier using a slope circuit using a pin diode according to another embodiment of the present invention.

According to an embodiment of the phase amplifier of the present invention, the satellite amplifier includes a slope circuit 100 using a pin diode according to any one of the various embodiments of the present invention described above. The description of various embodiments of the slope circuit 100 using the pin diode refers to the above-mentioned embodiment, and it will be apparent that the descriptions below do not disturb the understanding of those skilled in the art, even if the redundant description is omitted below. Do.

In addition, an amplifier input terminal 300 for receiving a high frequency signal and an amplifier output terminal 400 for outputting an amplified high frequency signal, and with reference to FIG. 4, attenuation transmitted and applied from the slope circuit 100 using a pin diode. It is configured to include an amplifier 200 for amplifying the high frequency signal.

The slope circuit 100 receives the high frequency signal applied from the amplifier input terminal 300 and transmits the attenuated high frequency signal to the amplifier 200 as described above.

Referring to FIG. 4, the slope circuit 100 of the satellite amplifier receives a satellite broadcast signal from an input duplexer (not shown) through an amplifier input terminal 300 and receives a high frequency satellite broadcast signal according to attenuation ratio according to a control voltage. Not much slope attenuation. The high frequency signal passing through the slope circuit 100 and exhibiting slope attenuation characteristics is amplified by the amplifier 200 and output through the amplifier output terminal 400.

The amplifier 200 of the satellite amplifier is to compensate for the attenuation occurs as the high frequency signal output from the satellite amplifier and transmitted in the premises is transmitted along the coaxial cable. Attenuation in the intra-room transmission over coaxial cable is more attenuated at higher frequencies. Therefore, in order to enable even transmission in the relative low frequency and high frequency areas in the premises transmission through coaxial cable, the satellite broadcasting signal passing through the slope circuit before being amplified by the amplifier 200 of the phase amplifier is relatively on the coaxial line. It is necessary to reduce the attenuation rate in the high frequency region with much attenuation than the low frequency region. As shown in FIG. 3B, in order to lower the attenuation rate of the high frequency region (2150 MHz band) of the satellite broadcast signal, the present invention includes a first pin diode D1 as shown in FIG. The slope attenuation unit 40 is formed by combining the resonance circuit unit 42, and as shown in FIG. 2, an output impedance matching unit 50 including the second resonance circuit unit is connected to the end of the slope attenuation unit 40 so that The desired attenuation characteristics are realized in the high frequency region.

According to the embodiment of the present invention, as described above, the slope attenuator 40 includes the pin diode D1 and the first resonant circuit part 42 connected in parallel thereto, and the first resonant circuit part 42 and the pin diode ( By providing an output impedance matching section 50 including a second resonance circuit section connected to the common node of D1), desired slope characteristics as shown in FIG. 3B are realized.

In an embodiment of the present invention, the amplifier 200 of the phase amplifier amplifies the satellite broadcast signal to be transmitted in the premises through the coaxial cable.

Furthermore, a broadband amplifier for receiving satellite and cable broadcasts using a satellite amplifier according to another aspect of the present invention can be obtained. The broadband amplifier for receiving satellite and cable broadcasts includes an input and output duplexer, a satellite amplifier, and a wired amplifier.

The input duplexer separates the mixed input satellite broadcast signal of the 950 MHz to 2150 MHz band and the cable broadcasting signal of the 50 MHz to 806 MHz band to transmit to the phase amplifier 100 and the wired amplifier part according to the embodiment of the present invention, respectively. do. As shown in FIG. 4, the satellite amplifier includes a slope circuit 100 and an amplifier 200. For details, refer to the above-described embodiments of the satellite amplifier.

The wired amplifier comprises a primary amplifier, an attenuation module and a secondary amplifier. The primary amplifier first amplifies the cable broadcasting signal in the 50 MHz to 806 MHz frequency band received from the input duplexer. The primary amplification is to amplify the weak signal compared to the satellite broadcasting signal of the relatively high frequency band so that the attenuation is easy, and the amplifier is designed in consideration of the maximum gain. The attenuation module attenuates for each frequency band while passing the frequency band of the first cable amplified cable broadcast signal from the primary amplifier. The secondary amplifier secondary amplifies the cable broadcast signal attenuated from the attenuation module so that it can be transmitted to the premises.

The output duplexer receives the satellite broadcasting signal amplified from the amplifying unit of the satellite amplifier and the cable broadcasting signal amplified from the secondary amplifier of the cable amplifier and transmits the signal to the coaxial cable connected to the external output terminal.

In the above, the present invention has been described in detail with reference to the preferred embodiments with reference to the accompanying drawings. The accompanying drawings and the foregoing embodiments are described by way of example to help those of ordinary skill in the art to understand the present invention, and thus may be embodied in a modified form without departing from the essential features of the present invention. It can be obvious. Therefore, the foregoing embodiments are to be considered as illustrative and not restrictive, and the scope of the present invention should be construed in accordance with the invention as set forth in the appended claims rather than the foregoing embodiments, the scope of which is in the art It includes various changes, alternatives, and equivalents by one of ordinary skill.

1 is a schematic block diagram illustrating a slope circuit using a pin diode used in a satellite amplifier according to an embodiment of the present invention.

2A and 2B are schematic circuit diagrams illustrating a slope circuit using a pin diode used in a satellite amplifier according to an embodiment of the present invention.

3A is a graph showing attenuation characteristics of a pin diode,

3B is a graph showing characteristics of a slope circuit using a pin diode and a resonance circuit according to an embodiment of the present invention.

4 is a schematic block diagram of a satellite amplifier using the slope circuit of FIG. 1 according to another embodiment of the present invention.

<Description of reference numerals for the main parts of the drawings>

10: input terminal 20: control voltage supply unit

30: voltage control unit 40: slope attenuation unit

42: first resonance circuit portion 50: output impedance matching portion

52: second resonant circuit 60: output terminal

100: slope circuit 200: amplifier

300: amplifier input stage 400: amplifier output stage

Claims (5)

In a slope circuit used in a satellite amplifier, An input terminal for receiving a high frequency signal and an output terminal for outputting a high frequency signal; A control voltage supply unit for applying a control voltage; A voltage adjusting unit for controlling the attenuation characteristic of the pin diode by adjusting the applied control voltage; And a first resonant circuit part connected to the pin diode and the pin diode in parallel between the input terminal and the output terminal to compensate for slope attenuation characteristics of the pin diode, and transmitting a high frequency signal applied from the input terminal to the voltage adjusting unit. A slope attenuating unit for adjusting the slope attenuation characteristic so that the attenuation characteristic of the pin diode is close to '0' in a preset high frequency band according to the control voltage adjusted by the control unit and transmitting to the output terminal; And An output configured to form a common node with an end of the slope attenuation portion, to match an impedance of a high frequency signal attenuated by the slope attenuation portion, and to perform an additional compensation for the slope compensation made in the first resonant circuit portion to be output through the output terminal; An impedance matching unit; Slope circuit using a pin diode comprising a. The method according to claim 1, The first resonant circuit portion is composed of a series resonant circuit (C1, L1), The output impedance matching part includes a second resonant circuit part for performing additional compensation for the slope compensation made in the first resonant circuit part, and the second resonant circuit part comprises a parallel resonant circuit (L3 ∥ C7). Slope circuit using a diode. The method according to claim 2, A first coupling capacitor C4 is provided between the connection node and the input terminal between the slope attenuation portion and the voltage regulating portion; And a second coupling capacitor (C5) between the common node between the slope attenuating portion and the output impedance matching portion and the output terminal. The method according to claim 3, And the first resonant circuit part and the second resonant circuit part each exhibit a resonance characteristic in a 2150 MHz band. An amplifier input terminal for receiving a high frequency signal and an amplifier output terminal for outputting an amplified high frequency signal; A slope circuit according to any one of claims 1 to 4, which receives a high frequency signal applied from the amplifier input terminal and performs slope attenuation and transmits the attenuated high frequency signal; And And an amplifier for amplifying the attenuated high frequency signal transmitted from the slope circuit.

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