CN110635815B - Circuit for automatic attenuation control of front-stage radio frequency input end of medium-short wave receiver - Google Patents
Circuit for automatic attenuation control of front-stage radio frequency input end of medium-short wave receiver Download PDFInfo
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- CN110635815B CN110635815B CN201910866222.4A CN201910866222A CN110635815B CN 110635815 B CN110635815 B CN 110635815B CN 201910866222 A CN201910866222 A CN 201910866222A CN 110635815 B CN110635815 B CN 110635815B
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03G—CONTROL OF AMPLIFICATION
- H03G3/00—Gain control in amplifiers or frequency changers
- H03G3/20—Automatic control
- H03G3/30—Automatic control in amplifiers having semiconductor devices
- H03G3/3036—Automatic control in amplifiers having semiconductor devices in high-frequency amplifiers or in frequency-changers
- H03G3/3042—Automatic control in amplifiers having semiconductor devices in high-frequency amplifiers or in frequency-changers in modulators, frequency-changers, transmitters or power amplifiers
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/06—Receivers
- H04B1/16—Circuits
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Abstract
The invention relates to a circuit for automatic attenuation control of a preceding stage radio frequency input end of a medium-short wave receiver, belonging to the technical field of communication. The invention comprises an antenna input interface AT-IN, a Control signal input interface Control, a 5V direct current power supply interface VCC-5V and GND, an attenuation signal output interface OUT and two different attenuation circuit modules; the two different attenuation circuit modules are specifically an attenuation circuit with fixed attenuation multiple controlled by a relay and an attenuation circuit with different attenuation multiple controlled by a triode switch voltage division circuit. The invention can be directly applied to the front stage of the radio frequency antenna input of the medium-short wave receiver, and automatically attenuates the control signal given by the external singlechip according to the strength of the actually received broadcast signal, thereby laying a foundation for the subsequent processing of the received signal.
Description
Technical Field
The invention relates to a circuit for automatic attenuation control of a preceding stage radio frequency input end of a medium-short wave receiver, belonging to the technical field of communication.
Background
In the broadcast transmitting station, when the medium short wave receiver monitors the actual broadcast signals, the broadcast signals under different frequencies need to be monitored in different time periods, and the signal strength of different broadcast signals is different when the medium short wave receiver receives the broadcast signals of different frequencies because the different transmitters of the broadcast transmitting station face different directions. If the receiving antenna of the medium-short wave receiver is just facing the direction of the transmitter of the received broadcast signal, the received broadcast signal is strong, which may cause distortion of the signal demodulated by the receiver. Although automatic gain control is already provided in the medium-short wave receiver, the dynamic adjustment range is limited.
Disclosure of Invention
The invention aims to solve the technical problem of providing a circuit for automatically controlling attenuation of a front-stage radio frequency input end of a medium-short wave receiver, which is used for solving the problem.
The technical scheme of the invention is as follows: a circuit for automatic attenuation Control of a preceding stage radio frequency input end of a medium-short wave receiver comprises an antenna input interface AT-IN, a Control signal input interface Control, 5V direct current power supply interfaces VCC-5V and GND, an attenuation signal output interface OUT and two different attenuation circuit modules; the two different attenuation circuit modules are specifically an attenuation circuit with fixed attenuation multiple controlled by a relay and an attenuation circuit with different attenuation multiple controlled by a triode switch voltage division circuit.
Furthermore, the two different attenuation circuit modules are controlled by the same external control end signal and can be selected according to requirements.
Furthermore, the attenuation circuit with fixed attenuation multiple controlled by the relay comprises a direct path and an attenuation path, and the relay can be automatically switched according to signals of an external control end.
Furthermore, the attenuation circuits with different attenuation multiples controlled by the voltage division circuit of the three-level tube switch comprise three paths of attenuations with different attenuation multiples, and the three-level tube switch can be controlled to automatically switch according to signals of an external control end.
Further, the attenuation circuit controlled by the relay and used for fixing attenuation multiple comprises jumper caps JP1, JP2 and JP3, resistors R1, R3 and R4 with the constant value of 500 ohms, a resistor R2 with the constant value of 1K, a resistor R5 with the constant value of 200 ohms, an optocoupler isolator U1 with the model of EL817, a diode D1 with the model of 1N4148, a triode Q1 with the model of S8050 and a relay K1 with the model of SDR-05V.
The attenuation circuit is composed of three T-shaped voltage dividing resistors, one end of a resistor R1 is connected with a ground GND, one end of a resistor R2 is connected with the other end of R1, the other end of the resistor R2 is connected with one end of a jumper cap JP1, the other end of the jumper cap JP1 is wirelessly connected with input radio frequency, one end of a resistor R3 is connected with one end of a resistor R2, the other end of the resistor R3 is connected with a 4-port of the relay K1, and in order to protect the relay K1, an optical coupler U1 with the model number of EL817 is adopted to isolate a control signal from the input radio frequency signal. One end of a 1-port resistor R5 of the optocoupler U1 is connected, the other end of a resistor R5 is connected with an external 5V direct-current power supply, a 2-port is connected with one end of the jumper cap JP2, the other end of the jumper cap JP2 is connected with an external control signal, a 3-port is connected with a resistor R4, a 4-port is connected with the external 5V direct-current power supply, the other end of the resistor R4 is connected with a b-stage of an NPN triode Q1 with the model of S8050, an e-pole of the triode Q1 is connected with ground GND, a c-pole is connected with an anode of a diode D1, a cathode of the diode D1 is connected with a 2-port of the relay K1, an input radio-frequency antenna is directly connected with a 5-port of the relay K1, a 3-port of the relay K1 is connected with one end of the jumper cap 3, and the other end of the jumper cap JP3 is connected with an output port OUT.
Further, the attenuation circuits controlled by the triode switch voltage division circuit and having different attenuation multiples comprise jumper caps JP4, JP5, JP6, JP7 and JP8, a capacitor C1 with a constant value of 0.1uF, a resistor R6 with a constant value of 200 ohms, a resistor R7 with a constant value of 100 ohms, a resistor R9 with a constant value of 300 ohms, a slide rheostat R8 with a model of 100K, resistors R10 and R11 with a constant value of 15K, and a triode Q2 with a model of S8050.
One end of the jumper cap JP5 is connected to an input radio frequency antenna, the other end is connected to the capacitor C1, the other end of the capacitor is connected to the jumper caps JP4, JP5, JP6, the other end of the jumper cap JP4 is connected to one end of the resistor R6, the other end of the jumper cap JP6 is connected to the resistor R7, the other end of the jumper cap JP8 is connected to one end of the resistor R9, the other ends of the resistors R6, R7, R9 are connected to the 1 port of the jumper cap JP7, the 2 port of the jumper cap JP7 is connected to the output port OUT, the 2 port of the jumper cap JP9 is connected to an external control signal, the 1 port is connected to one end of the resistor R10, the other end of the resistor R10 is connected to the 5V of an external dc power supply, one end of the resistor R11 is connected to the 1 port of the jumper cap 9, the other end is connected to the b pole of the triode Q2, and the triode Q2 is connected to GND, the c pole is connected with the lower end and the middle end of the slide rheostat R8, and the upper end of the slide rheostat R8 is connected with the 1 port of the jumper cap JP 7.
The invention has the beneficial effects that:
(1) the circuit for controlling the automatic attenuation of the front stage radio frequency input end of the medium-short wave receiver can be directly applied to the front stage of the radio frequency antenna input of the medium-short wave receiver, and automatically attenuates according to the strength of the actually received broadcast signal by combining the control signal given by an external singlechip.
(2) The invention can adjust the resistance of the attenuation circuit to achieve the required attenuation multiple under the condition of keeping the input and output impedance unchanged.
(3) Because both the two attenuation modules adopt the modularized design, multiple stages can be added at will for cascade connection according to the actual needs of users so as to increase the attenuation range.
(4) The jumper caps in the circuit can be adjusted as required to select two different attenuation circuit modules.
Drawings
FIG. 1 is a circuit diagram of the present invention;
Detailed Description
The invention is further described with reference to the following drawings and detailed description.
Example 1: as shown in fig. 1, a circuit for automatic attenuation control of a preceding stage radio frequency input end of a medium-short wave receiver is characterized in that: the device comprises an antenna input interface AT-IN, a Control signal input interface Control, 5V direct-current power supply interfaces VCC-5V and GND, an attenuation signal output interface OUT and two different attenuation circuit modules; the two different attenuation circuit modules are specifically an attenuation circuit with fixed attenuation multiple controlled by a relay and an attenuation circuit with different attenuation multiple controlled by a triode switch voltage division circuit.
Preferably, the two different attenuation circuit modules are controlled by the same external control end signal.
Preferably, the attenuation circuit with fixed attenuation multiple controlled by the relay comprises a straight-through path and an attenuation path, and the relay can be automatically switched according to an external control end signal.
Preferably, the attenuation circuits with different attenuation multiples controlled by the voltage division circuit of the triode switch comprise three paths of attenuations with different attenuation multiples, and the automatic switching of the triode switch can be controlled according to signals of an external control end.
Preferably, the attenuation circuit with fixed attenuation multiple controlled by the relay comprises jumper caps JP1, JP2 and JP3, resistors R1, R3 and R4 with the constant value of 500 ohms, a resistor R2 with the constant value of 1K, a resistor R5 with the constant value of 200 ohms, an optocoupler isolator U1 with the model of EL817, a diode D1 with the model of 1N4148, a triode Q1 with the model of S8050 and a relay K1 with the model of SDR-05V.
The attenuation circuit is composed of three T-shaped voltage dividing resistors, one end of a resistor R1 is connected with a ground GND, one end of a resistor R2 is connected with the other end of R1, the other end of the resistor R2 is connected with one end of a jumper cap JP1, the other end of the jumper cap JP1 is wirelessly connected with input radio frequency, one end of a resistor R3 is connected with one end of a resistor R2, the other end of the resistor R3 is connected with a 4-port of the relay K1, and in order to protect the relay K1, an optical coupler U1 with the model number of EL817 is adopted to isolate a control signal from the input radio frequency signal. One end of a 1-port resistor R5 of the optocoupler U1 is connected, the other end of a resistor R5 is connected with an external 5V direct-current power supply, a 2-port is connected with one end of the jumper cap JP2, the other end of the jumper cap JP2 is connected with an external control signal, a 3-port is connected with a resistor R4, a 4-port is connected with the external 5V direct-current power supply, the other end of the resistor R4 is connected with a b-stage of an NPN triode Q1 with the model of S8050, an e-pole of the triode Q1 is connected with ground GND, a c-pole is connected with an anode of a diode D1, a cathode of the diode D1 is connected with a 2-port of the relay K1, an input radio-frequency antenna is directly connected with a 5-port of the relay K1, a 3-port of the relay K1 is connected with one end of the jumper cap 3, and the other end of the jumper cap JP3 is connected with an output port OUT.
Preferably, the attenuation circuits with different attenuation multiples controlled by the triode switch voltage dividing circuit comprise jumper caps JP4, JP5, JP6, JP7 and JP8, a capacitor C1 with a fixed value of 0.1uF, a resistor R6 with a fixed value of 200 ohms, a resistor R7 with a fixed value of 100 ohms, a resistor R9 with a fixed value of 300 ohms, a sliding rheostat R8 with a model of 100K, resistors R10 and R11 with a fixed value of 15K, and an NPN triode Q2 with a model of S8050.
One end of the jumper cap JP5 is connected to an input radio frequency antenna, the other end is connected to the capacitor C1, the other end of the capacitor is connected to the jumper caps JP4, JP5, JP6, the other end of the jumper cap JP4 is connected to one end of the resistor R6, the other end of the jumper cap JP6 is connected to the resistor R7, the other end of the jumper cap JP8 is connected to one end of the resistor R9, the other ends of the resistors R6, R7, R9 are connected to the 1 port of the jumper cap JP7, the 2 port of the jumper cap JP7 is connected to the output port OUT, the 2 port of the jumper cap JP9 is connected to an external control signal, the 1 port is connected to one end of the resistor R10, the other end of the resistor R10 is connected to the 5V of an external dc power supply, one end of the resistor R11 is connected to the 1 port of the jumper cap 9, the other end is connected to the b pole of the triode Q2, and the triode Q2 is connected to GND, the c pole is connected with the lower end and the middle end of the slide rheostat R8, and the upper end of the slide rheostat R8 is connected with the 1 port of the jumper cap JP 7.
The working principle of the invention is as follows: the wireless interface AT-IN is connected with an external antenna signal; the Control signal interface Control is connected with a Control signal of an external singlechip; the 5V direct-current power supply interfaces VCC-5V and GND are respectively connected with an external 5V direct-current power supply; and the attenuation signal output interface OUT is connected with a wireless input interface of an external medium-short wave receiver.
When the jumper caps JP1, JP2 and JP3 are connected and the jumper caps JP5 and JP7 are disconnected, the module starts to work, the attenuation multiple is a fixed attenuation multiple, when the Control signal input interface Control does not receive an external Control signal, the signal passes through a T-type voltage division circuit composed of R1, R2 and R3, so that the signal is attenuated by the fixed multiple, and when the Control signal input interface Control receives a signal sent by an external single chip microcomputer, the relay K1 is automatically started, so that the signal does not pass through the T-type voltage division circuit composed of R1, R2 and R3, but is directly output, and the signal is not attenuated.
When the jumper caps JP1, JP2 and JP3 are disconnected and the jumper caps JP5 and JP7 are connected, the second module starts to work, the attenuation multiple can be selected through the jumper caps JP4, JP6 and JP8 according to actual conditions, when the jumper cap JP4 is selected to be connected, the attenuation multiple is 25dB, when the jumper cap JP6 is selected to be connected, the attenuation multiple is 35dB, and when the jumper cap JP8 is selected to be connected, the attenuation multiple is 35 dB.
While the present invention has been described in detail with reference to the embodiments shown in the drawings, the present invention is not limited to the embodiments, and various changes can be made without departing from the spirit and scope of the present invention.
Claims (2)
1. A circuit for automatic attenuation control of a preceding stage radio frequency input end of a medium short wave receiver is characterized in that: the device comprises an antenna input interface AT-IN, a Control signal input interface Control, 5V direct-current power supply interfaces VCC-5V and GND, an attenuation signal output interface OUT and two different attenuation circuit modules; the two different attenuation circuit modules are specifically an attenuation circuit with fixed attenuation times controlled by a relay and an attenuation circuit with different attenuation times controlled by a triode switch voltage division circuit;
the two different attenuation circuit modules are controlled by the same external control end signal;
the attenuation circuit with fixed attenuation multiple controlled by the relay comprises a straight-through path and an attenuation path, and the relay can be automatically switched according to an external control end signal;
the attenuation circuits with different attenuation multiples controlled by the voltage division circuit of the triode switch comprise three paths of attenuations with different attenuation multiples, and the automatic switching of the triode switch can be controlled according to signals of an external control end;
when the jumper caps JP1, JP2 and JP3 are disconnected and the jumper caps JP5 and JP7 are connected, the second module starts to work, the attenuation multiple can be selected through the jumper caps JP4, JP6 and JP8 according to actual conditions, when the jumper cap JP4 is selected to be connected, the attenuation multiple is 25dB, when the jumper cap JP6 is selected to be connected, the attenuation multiple is 35dB, and when the jumper cap JP8 is selected to be connected, the attenuation multiple is 35 dB;
the attenuation circuit of the fixed attenuation multiple controlled by the relay comprises jumper caps JP1, JP2 and JP3, resistors R1, R3 and R4 with the constant value of 500 ohms, a resistor R2 with the constant value of 1K, a resistor R5 with the constant value of 200 ohms, an optocoupler isolator U1 with the model of EL817, a diode D1 with the model of 1N4148, a triode Q1 with the model of S8050 and a relay K1 with the model of SDR-05V;
the attenuation-primary circuit consists of three voltage-dividing resistors of a T type, one end of a resistor R1 is connected with a ground GND, one end of a resistor R2 is connected with the other end of R1, the other end of the resistor R2 is connected with one end of a jumper cap JP1, the other end of the jumper cap JP1 is wirelessly connected with input radio frequency, one end of a resistor R3 is connected with one end of a resistor R2, the other end of the resistor R3 is connected with a 4 port of a relay K1, one end of a 1-port resistor R5 of the optocoupler U1 is connected with one end of an external 5V direct current power supply, the other end of the resistor R5 is connected with one end of the jumper cap JP2, the other end of the resistor R3 is connected with an external control signal, a 3 port is connected with the resistor R4, the 4 port is connected with the external 5V direct current power supply, the other end of the resistor R4 is connected with a b-stage of an NPN type triode Q1 of an S8050, an e pole of the triode Q1 is connected with the ground GND, and a c pole of the diode D1, the cathode of the diode D1 is connected with the 2 port of the relay K1, the input radio frequency antenna is directly connected with the 5 port of the relay K1, the 3 port of the relay K1 is connected with one end of the jumper cap JP3, and the other end of the jumper cap JP3 is connected with the output port OUT.
2. The circuit according to claim 1, characterized in that it comprises: the attenuation circuits with different attenuation multiples controlled by the triode switch voltage division circuit comprise jumper caps JP4, JP5, JP6, JP7 and JP8, a capacitor C1 with a fixed value of 0.1uF, a resistor R6 with a fixed value of 200 ohms, a resistor R7 with a fixed value of 100 ohms, a resistor R9 with a fixed value of 300 ohms, a slide rheostat R8 with a model of 100K, resistors R10 and R11 with a fixed value of 15K, and an NPN triode Q2 with a model of S8050;
one end of the jumper cap JP5 is connected to an input radio frequency antenna, the other end is connected to the capacitor C1, the other end of the capacitor is connected to the jumper caps JP4, JP5, JP6, the other end of the jumper cap JP4 is connected to one end of the resistor R6, the other end of the jumper cap JP6 is connected to the resistor R7, the other end of the jumper cap JP8 is connected to one end of the resistor R9, the other ends of the resistors R6, R7, R9 are connected to the 1 port of the jumper cap JP7, the 2 port of the jumper cap JP7 is connected to the output port OUT, the 2 port of the jumper cap JP9 is connected to an external control signal, the 1 port is connected to one end of the resistor R10, the other end of the resistor R10 is connected to the 5V of an external dc power supply, one end of the resistor R11 is connected to the 1 port of the jumper cap 9, the other end is connected to the b pole of the triode Q2, and the triode Q2 is connected to GND, the c pole is connected with the lower end and the middle end of the slide rheostat R8, and the upper end of the slide rheostat R8 is connected with the 1 port of the jumper cap JP 7.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910866222.4A CN110635815B (en) | 2019-09-09 | 2019-09-09 | Circuit for automatic attenuation control of front-stage radio frequency input end of medium-short wave receiver |
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| CN201910866222.4A CN110635815B (en) | 2019-09-09 | 2019-09-09 | Circuit for automatic attenuation control of front-stage radio frequency input end of medium-short wave receiver |
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| CN113109620A (en) * | 2021-03-03 | 2021-07-13 | 昆明理工大学 | Power measurement circuit of high-power radio frequency signal |
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| CN109474256A (en) * | 2018-10-15 | 2019-03-15 | 成都信息工程大学 | A kind of radio frequency signal precision step attenuation method and attenuation circuit |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104753483B (en) * | 2013-12-30 | 2018-07-06 | 国民技术股份有限公司 | Power amplifier and its gain-attenuation control circuitry |
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| EP0788185B1 (en) * | 1996-01-31 | 2002-05-02 | Matsushita Electric Industrial Co., Ltd. | Switch attenuator |
| CN2273933Y (en) * | 1996-08-20 | 1998-02-04 | 许兆炘 | Voltage-controlled attenuator for cable television signals |
| CN201286082Y (en) * | 2008-09-10 | 2009-08-05 | 俞惟铨 | Wideband radio frequency amplifier with three function |
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| US8971792B2 (en) * | 2012-06-25 | 2015-03-03 | Commscope, Inc. Of North Carolina | Signal amplifiers that switch to an attenuated or alternate communications path in response to a power interruption |
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