Multi-spectrum common channel demodulation output circuit and downconverter

Abstract

The present invention discloses a multi-spectrum common-path demodulation output circuit and a frequency downconverter, comprising a polarization amplifier circuit, a phase lock, a signal output interface, a ground wave amplifier circuit and a ground wave frequency selection circuit, wherein the input end of the polarization amplifier circuit is connected with a polarization antenna, the input end of the phase lock is connected with the output end of the polarization amplifier circuit, the signal output interface is connected with the first output end of the phase lock, the input end of the ground wave amplifier circuit is connected with a ground wave input interface, the input end of the ground wave frequency selection circuit is connected with the output end of the ground wave amplifier circuit, and the output end of the ground wave frequency selection circuit is connected with the signal output interface. The circuit of the present invention has a polarization antenna and a ground wave input interface, can receive satellite TV signals and ground wave television signals, and can realize the common-path output of satellite TV signals and ground wave television signals.

Description

Technical Field

[0001] The present invention relates to the technical field of frequency downconverters, and in particular to a multi-spectrum common-path demodulation output circuit and a frequency downconverter. Background Art

[0002] With the advancement of science and technology and the improvement of living standards, televisions have become popular around the world. With the development of communication technology, the proportion of households with televisions that watch satellite TV is increasing, and the downconverter is one of the necessary equipment for watching satellite TV. However, the existing downconverter only has the function of receiving satellite signals. In fact, in addition to watching TV programs and radio programs through satellite signals, you can also watch TV programs and radio programs through terrestrial signals. The resources of terrestrial wave signals are very rich. At present, there are still many countries and regions that transmit TV programs and radio programs within the bandwidth of UHF (ultra-high frequency) and VHF (very high frequency). When the existing downconverter receives satellite TV signals, if you want to receive terrestrial TV signals and radio signals, you need to add additional UHF or VHF amplifiers, switch converters and other equipment, which is inconvenient to use and costly. Summary of the invention

[0003] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention provides a multi-spectrum common channel demodulation output circuit capable of receiving satellite television signals and terrestrial television signals.

[0004] In the first aspect, a multi-spectrum common-path demodulation output circuit according to an embodiment of the present invention includes a polarization amplifier circuit, whose input end is connected to a polarization antenna; a phase locker, whose input end is connected to the output end of the polarization amplifier circuit; a signal output interface, which is connected to a first output end of the phase locker; a ground wave amplifier circuit, whose input end is connected to a ground wave input interface; a ground wave frequency selection circuit, whose input end is connected to the output end of the ground wave amplifier circuit, and whose output end is connected to the signal output interface.

[0005] The multi-spectrum common-channel demodulation output circuit according to the embodiment of the present invention has at least the following beneficial effects: the circuit of the present invention has a polarized antenna and a terrestrial wave input interface, and can receive satellite TV signals and terrestrial wave TV signals. The satellite TV signals are processed by the polarization amplifier circuit and the phase lock and then output through the signal output interface. The terrestrial wave TV signals are processed by the terrestrial wave amplifier circuit and the terrestrial wave frequency selection circuit and then output through the signal interface, thereby realizing the common-channel output of satellite TV signals and terrestrial wave TV signals.

[0006] According to some embodiments of the present invention, the polarization amplifier circuit is a single polarization amplifier circuit or a dual polarization amplifier circuit.

[0007] According to some embodiments of the present invention, the dual-polarization amplification circuit includes a horizontal polarization amplification circuit, a vertical polarization amplification circuit and a bias control circuit, and the horizontal polarization amplification circuit and the vertical polarization amplification circuit both include a multi-stage cascaded first amplification circuit, wherein the input end of the first stage of the first amplification circuit is connected to the corresponding polarized antenna, the output end of the last stage of the first amplification circuit is connected to the input end of the phase lock, and the bias control circuit is connected to the control end of at least one stage of the first amplification circuit.

[0008] According to some embodiments of the present invention, the control end of the first amplifier circuit of the last stage is connected to the second output end of the phase lock.

[0009] According to some embodiments of the present invention, the number of stages of the first amplifier circuit is 3, the control ends of the first-stage first amplifier circuit and the second-stage first amplifier circuit are respectively connected to the bias control circuit, and the control end of the third-stage first amplifier circuit is connected to the second output end of the phase lock.

[0010] According to some embodiments of the present invention, a first LC circuit is connected between the output end of the polarization amplifier circuit and the input end of the phase lock.

[0011] According to some embodiments of the present invention, the ground wave amplification circuit includes a transistor Q4, the base of the transistor Q4 is connected to a first coupling capacitor, and is connected to the ground wave input interface through the first coupling capacitor, a first microstrip inductor is connected between the base of the transistor Q4 and a working power supply, a second microstrip inductor is connected between the collector of the transistor Q4 and the working power supply, the collector of the transistor Q4 is also connected to a second coupling capacitor, and is connected to the ground wave frequency selection circuit through the second coupling capacitor.

[0012] According to some embodiments of the present invention, the ground wave frequency selection circuit includes at least one second LC circuit.

[0013] According to some embodiments of the present invention, the output end of the last-stage LC circuit is connected to a third coupling capacitor and is connected to the signal output interface via the third coupling capacitor.

[0014] In a second aspect, a multi-spectrum common-path demodulation output downconverter according to an embodiment of the present invention includes the multi-spectrum common-path demodulation output circuit described above.

[0015] The multi-spectrum common-path demodulation output downconverter according to the embodiment of the present invention has at least the following beneficial effects: the downconverter of the present invention has a polarized antenna and a terrestrial wave input interface, and can receive satellite TV signals and terrestrial wave TV signals. The satellite TV signals are processed by a polarized amplifier circuit and a phase lock and then output through a signal output interface, and the terrestrial wave TV signals are processed by a terrestrial wave amplifier circuit and a terrestrial wave frequency selection circuit and then output through a signal interface, thereby realizing the common-path output of satellite TV signals and terrestrial wave TV signals.

[0016] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0018] Figure 1 It is a principle block diagram of a multi-spectrum common-channel demodulation output circuit according to an embodiment of the present invention;

[0019] Figure 2 It is a circuit principle diagram of a multi-spectrum common-channel demodulation output circuit according to an embodiment of the present invention. DETAILED DESCRIPTION

[0020] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0021] In the description of the present invention, "several" means one or more, "more" means more than two, "greater than", "less than", "exceed" etc. are understood as not including the number itself, and "above", "below", "within" etc. are understood as including the number itself. If there is a description of "first" or "second", it is only used for the purpose of distinguishing the technical features, and cannot be understood as indicating or implying the relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0022] In the description of the present invention, unless otherwise clearly defined, terms such as connection and cascade should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in the present invention in combination with the specific content of the technical solution.

[0023] Please refer to Figure 1This embodiment discloses a multi-spectrum common-path demodulation output circuit, including a polarization amplifier circuit 100, a phase lock 200, a signal output interface 300, a ground wave amplifier circuit 400 and a ground wave frequency selection circuit 500, wherein the input end of the polarization amplifier circuit 100 is connected to a polarized antenna 110, the input end of the phase lock 200 is connected to the output end of the polarization amplifier circuit 100, the signal output interface 300 is connected to the first output end of the phase lock 200, the input end of the ground wave amplifier circuit 400 is connected to a ground wave input interface 410, the input end of the ground wave frequency selection circuit 500 is connected to the output end of the ground wave amplifier circuit 400, and the output end of the ground wave frequency selection circuit 500 is connected to the signal output interface 300.

[0024] The circuit of this embodiment has a polarized antenna 110 and a terrestrial wave input interface 410, and can receive satellite TV signals and terrestrial wave TV signals. The satellite TV signal is processed by the polarization amplifier circuit 100 and the phase lock 200 and then output through the signal output interface 300, and the terrestrial wave TV signal is processed by the terrestrial wave amplifier circuit 400 and the terrestrial wave frequency selection circuit 500 and then output through the signal interface, thereby realizing the common output of the satellite TV signal and the terrestrial wave TV signal.

[0025] According to different application requirements, the polarization amplifier circuit 100 is a single polarization amplifier circuit (not shown) or a dual polarization amplifier circuit, wherein the dual polarization amplifier circuit includes a horizontal polarization amplifier circuit 120, a vertical polarization amplifier circuit 130 and a bias control circuit 140, and the horizontal polarization amplifier circuit 120 and the vertical polarization amplifier circuit 130 both include a multi-stage cascaded first amplifier circuit, and the multi-stage first amplifier circuit is used to perform low-noise amplification on the satellite TV signal so that the quality and strength of the satellite TV signal meet the requirements. Among them, the input end of the first stage first amplifier circuit is connected to the corresponding polarization antenna 110, the output end of the last stage first amplifier circuit is connected to the input end of the phase lock 200, the bias control circuit 140 is connected to the control end of at least one stage first amplifier circuit, and the bias control circuit 140 is used to provide a stable working bias for the corresponding first amplifier circuit.

[0026] In some embodiments, the control end of the last-stage first amplifier circuit is connected to the second output end of the phase lock 200, and the phase lock 200 can control the conduction and cutoff of the last-stage first amplifier circuit, thereby realizing the switching control of the signal between horizontal polarization and vertical polarization, and can also enhance the isolation between horizontal polarization and vertical polarization and reduce the power consumption of the circuit.

[0027] In some embodiments, the number of stages of the first amplifier circuit is 3, the control ends of the first-stage first amplifier circuit and the second-stage first amplifier circuit are respectively connected to the bias control circuit 140, and the control end of the third-stage first amplifier circuit is connected to the second output end of the phase-locked device 200.

[0028] In order to improve signal quality and reduce signal interference, a first LC circuit is connected between the output end of the polarization amplifier circuit 100 and the input end of the phase lock 200. The first LC circuit is used to filter the amplified signal and output it to the phase lock 200.

[0029] Refer to the following Figure 1 and Figure 2 The multi-spectrum common-path demodulation output circuit of the present invention is described in detail with a specific embodiment. It is worth noting that the following description is only an exemplary description and is not a specific limitation of the present invention.

[0030] Please refer to Figure 1 and Figure 2 The multi-spectrum common channel demodulation output circuit of this embodiment includes a horizontal polarization amplifier circuit 120, a vertical polarization amplifier circuit 130, a phase lock 200, a signal output interface 300, a ground wave amplifier circuit 400 and a ground wave frequency selection circuit 500. The input end of the horizontal polarization amplifier circuit 120 is connected to the horizontal polarization antenna E1, the input end of the vertical polarization amplifier circuit 130 is connected to the vertical polarization antenna E2, the output end of the horizontal polarization amplifier circuit 120 and the output end of the vertical polarization amplifier circuit 130 are respectively connected to the input end of the phase lock 200, the first output end of the phase lock 200 is connected to the signal output interface 300, the input end of the ground wave amplifier circuit 400 is connected to the ground wave input interface 410, the output end of the ground wave amplifier circuit 400 is connected to the ground wave frequency selection circuit 500, and the output end of the ground wave frequency selection circuit 500 is connected to the signal output interface 300. This embodiment can receive satellite TV signals and ground wave TV signals without adding additional UHF or VHF amplifiers, switch converters and other equipment, and is easy to use.

[0031] The horizontal polarization amplifier circuit 120 and the vertical polarization amplifier circuit 130 respectively include a cascaded first-stage first amplifier circuit, a second-stage first amplifier circuit and a third-stage first amplifier circuit, wherein in the horizontal polarization amplifier circuit 120, the MOS transistor Q2, the MOS transistor Q3 and the MOS transistor Q1 are respectively used to perform first-stage amplification, second-stage amplification and third-stage amplification on the signal, and in the vertical polarization amplifier circuit 130, the MOS transistor Q6, the MOS transistor Q5 and the MOS transistor Q7 are respectively used to perform first-stage amplification, second-stage amplification and third-stage amplification on the signal, wherein the control ends of the first-stage first amplifier circuit and the second-stage first amplifier circuit are respectively connected to the bias control circuit 140. In this embodiment, the bias control circuit 140 uses a chip IC2 of model D8400. The chip IC2 of this model can provide a stable constant current and constant voltage and has an automatic adjustment function. The chip is respectively connected to the MOS transistor Q2, the MOS transistor Q3, the MOS transistor Q6 and the MOS transistor Q5, and can provide a stable working bias voltage for the MOS transistor Q2, the MOS transistor Q3, the MOS transistor Q6 and the MOS transistor Q5.

[0032] The control end of the third-stage first amplifier circuit is connected to the second output end of the phase lock 200. The phase lock 200 of this embodiment adopts a phase-locked loop chip IC1. The chip has high integration and few peripheral circuits, which is conducive to simplifying the circuit and realizing miniaturized design of the product. The chip is connected to the MOS transistor Q1 and the MOS transistor Q7 respectively, and can control the conduction and cutoff of the MOS transistor Q1 and the MOS transistor Q7, so as to realize the switching of the signal between the horizontal polarization and the vertical polarization, and can also enhance the isolation between the horizontal polarization and the vertical polarization and help reduce the power consumption of the circuit.

[0033] A first LC circuit is connected between the output end of the third-stage first amplifier circuit and the phase lock 200, wherein the first LC circuit includes a first microstrip inductor L3, a second microstrip inductor L4 and a capacitor C20. The first LC circuit is used to filter the amplified signal and output it to the phase lock 200, which is beneficial to improving the signal quality.

[0034] The phase lock 200 performs low-noise amplification, phase detection, loop filtering, voltage-controlled oscillation, demodulation and amplification on the input satellite signal and then outputs it through the signal output interface 300, wherein a capacitor C21 is connected between the phase lock 200 and the signal output interface 300, and the capacitor C21 can play an isolation role, which is beneficial to prevent the signals at both ends of the capacitor C21 from interfering with each other.

[0035] The ground wave amplifying circuit 400 includes a transistor Q4, the base of which is connected to a capacitor C6 and connected to a ground wave input interface 410 through the capacitor C6, a first microstrip inductor L5 is connected between the base of the transistor Q4 and a working power supply, and a second microstrip inductor L6 is connected between the collector of the transistor Q4 and the working power supply. The first microstrip inductor L5 and the second microstrip inductor L6 can reduce the influence of the working power supply on the ground wave signal, which is beneficial to improving the signal quality. The working power supply is provided by a voltage regulator chip IC3, and the collector of the transistor Q4 is also connected to a capacitor C11 and connected to a ground wave frequency selection circuit 500 through the capacitor C11, wherein the capacitor C6 is the first coupling capacitor, and the capacitor C11 is the second coupling capacitor. The first coupling capacitor realizes isolation between the ground wave input interface 410 and the transistor Q4, which is beneficial to improving the signal quality, and the second coupling capacitor can play an isolation role, which is beneficial to preventing the signals at both ends of the second coupling capacitor from interfering with each other.

[0036] The ground wave frequency selection circuit 500 includes two-stage second LC circuits connected in cascade, wherein the first-stage second LC circuit includes an inductor L2 and a capacitor C16, and the second-stage second LC circuit includes an inductor L1 and a capacitor C17. The use of two-stage second LC circuits can perform frequency selection output on the signal amplified by the transistor Q4, and is conducive to isolating the ground wave signal from the polarization signal.

[0037] The output end of the second LC circuit of the second stage is connected to a capacitor C19, and is connected to the signal output interface 300 through the capacitor C19, wherein the capacitor C19 is the third coupling capacitor, and the third coupling capacitor can play an isolation role to reduce signal interference.

[0038] According to an embodiment of the present invention, a multi-spectrum common-path demodulation output downconverter is also disclosed, comprising the multi-spectrum common-path demodulation output circuit mentioned above.

[0039] The downconverter of this embodiment has a polarized antenna 110 and a terrestrial wave input interface 410, and can receive satellite TV signals and terrestrial wave TV signals. The satellite TV signal is processed by the polarization amplifier circuit 100 and the phase lock 200 and then output through the signal output interface 300, and the terrestrial wave TV signal is processed by the terrestrial wave amplifier circuit 400 and the terrestrial wave frequency selection circuit 500 and then output through the signal interface, thereby realizing the common output of the satellite TV signal and the terrestrial wave TV signal.

[0040] The embodiments of the present invention are described in detail above with reference to the accompanying drawings, but the present invention is not limited to the above embodiments, and various changes can be made within the knowledge scope of ordinary technicians in the relevant technical field without departing from the purpose of the present invention.

Claims

1. A multi-spectrum common-path demodulation output circuit, characterized in that: include: A polarization amplifier circuit (100), an input end of which is connected to a polarization antenna (110); A phase lock (200), the input end of which is connected to the output end of the polarization amplifier circuit (100); A signal output interface (300) connected to the first output end of the phase lock (200); A ground wave amplifying circuit (400), the input end of which is connected to a ground wave input interface (410); A ground wave frequency selection circuit (500), the input end of which is connected to the output end of the ground wave amplification circuit (400), and the output end of the ground wave frequency selection circuit (500) is connected to the signal output interface (300); The polarization amplifier circuit (100) is a single polarization amplifier circuit or a dual polarization amplifier circuit; The dual-polarization amplifier circuit comprises a horizontal polarization amplifier circuit (120), a vertical polarization amplifier circuit (130) and a bias control circuit (140), wherein the horizontal polarization amplifier circuit (120) and the vertical polarization amplifier circuit (130) both comprise a multi-stage cascaded first amplifier circuit, wherein the input end of the first stage of the first amplifier circuit is connected to the corresponding polarized antenna (110), the output end of the last stage of the first amplifier circuit is connected to the input end of the phase lock (200), and the bias control circuit (140) is connected to the control end of at least one stage of the first amplifier circuit; Wherein, the control terminal of the last stage of the first amplifier circuit is connected to the second output terminal of the phase lock (200); The first amplifier circuit has three stages, the control ends of the first stage of the first amplifier circuit and the second stage of the first amplifier circuit are respectively connected to the bias control circuit (140), and the control end of the third stage of the first amplifier circuit is connected to the second output end of the phase lock (200).

2. The multi-spectrum common-channel demodulation output circuit according to claim 1, characterized in that: A first LC circuit is connected between the output end of the polarization amplification circuit (100) and the input end of the phase lock (200).

3. The multi-spectrum common-channel demodulation output circuit according to claim 1, characterized in that: The ground wave amplifying circuit (400) comprises a transistor Q4, the base of the transistor Q4 is connected to a first coupling capacitor and is connected to the ground wave input interface (410) via the first coupling capacitor, a first microstrip inductor is connected between the base of the transistor Q4 and a working power supply, a second microstrip inductor is connected between the collector of the transistor Q4 and the working power supply, the collector of the transistor Q4 is also connected to a second coupling capacitor and is connected to the ground wave frequency selection circuit (500) via the second coupling capacitor.

4. The multi-spectrum common-channel demodulation output circuit according to claim 1 or 3, characterized in that: The ground wave frequency selection circuit (500) comprises at least one second LC circuit.

5. The multi-spectrum common-channel demodulation output circuit according to claim 4, characterized in that: The output end of the last stage LC circuit is connected to a third coupling capacitor, and is connected to the signal output interface (300) via the third coupling capacitor.

6. A multi-spectrum common channel demodulation output downconverter, characterized in that: It comprises the multi-spectrum common-path demodulation output circuit as described in any one of claims 1 to 5.

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