A shortwave radio frequency communication fast response transceiver circuit

Abstract

The present invention provides a short-wave radio frequency communication fast response transceiver circuit, comprising two-way amplification circuit, a section selection switch and a transceiver switch circuit; the transceiver switch circuit is connected to two drive circuits with the same structure; the two drive circuits each comprise a field effect tube VQ301, a field effect tube VQ302 and a field effect tube VQ303; the G pole of the field effect tube VQ301 is connected to the D pole of the field effect tube VQ302, and is connected to the D pole of the field effect tube VQ301 through a series resistor R301 and a resistor R302, and further The diode D301 and the inductor L301 are connected in parallel to the D pole of the field effect tube VQ303; the S pole of the field effect tube VQ301 is connected to the D pole of the field effect tube VQ303; the G pole of the field effect tube VQ302 is connected to the G pole of the field effect tube VQ303 through the series resistor R303 and the resistor R304; the S pole of the field effect tube VQ302 is connected to the S pole of the field effect tube VQ303 and is connected to the positive low voltage; the connection point between the resistor R301 and the resistor R302 is connected to the negative high voltage. The present invention can effectively shorten the response time of the transceiver switch circuit, sensitively switch the transceiver state, and meet the communication requirements of fast response.

Description

Technical Field

[0001] The present invention relates to the field of radio frequency technology, and more specifically to a short-wave radio frequency communication fast response transceiver circuit. Background Art

[0002] Shortwave communication is a form of radio communication, mainly referring to signal communication within the 1.6M to 30M frequency band. It has the advantages of simple equipment, low cost, convenient and flexible use, and is one of the important means of short, medium and long-distance military and civilian communications.

[0003] Existing shortwave communication devices generally have both receiving and transmitting functions, and the receiving / transmitting function switching is realized through the transceiver switch circuit; however, the transceiver response time of the existing shortwave communication devices is relatively long, and they cannot switch between the receiving state and the transmitting state sensitively, which affects the user experience and cannot meet the requirements of fast response communication. Summary of the invention

[0004] In order to overcome the shortcomings and deficiencies in the prior art, the purpose of the present invention is to provide a short-wave radio frequency communication fast response transceiver circuit; the present invention can effectively shorten the response time of the transceiver switch circuit, sensitively switch the transceiver state, and meet the fast response communication requirements.

[0005] In order to achieve the above object, the present invention is implemented by the following technical scheme: a short-wave radio frequency communication fast response transceiver circuit, characterized in that: it includes two-way amplifier circuit, a section switch and a transceiver switch circuit; the two-way amplifier circuit is respectively connected to the section switch; the section switch is respectively connected to the receiving port and the antenna port through the transceiver switch circuit to realize the switching of the receiving and transmitting functions;

[0006] The transceiver switch circuit is connected to two drive circuits with the same structure; both drive circuits include field effect tube VQ301, field effect tube VQ302 and field effect tube VQ303; the G pole of field effect tube VQ301 is connected to the D pole of field effect tube VQ302, and is connected to the D pole of field effect tube VQ301 through a series resistor R301 and a resistor R302, and is also connected to the field effect tube VQ3 through a parallel diode D301 and an inductor L301. 03; the S pole of the field effect tube VQ301 is connected to the D pole of the field effect tube VQ303, and is grounded through the capacitor C301; the G pole of the field effect tube VQ302 is connected to the G pole of the field effect tube VQ303 through the series resistor R303 and the resistor R304; the S pole of the field effect tube VQ302 is connected to the S pole of the field effect tube VQ303, and is connected to the positive low voltage; the connection between the resistor R301 and the resistor R302 is connected to the negative high voltage;

[0007] In one of the driving circuits, the connection point (RA) between the resistor R303 and the resistor R304 is connected to the external T / R control port through an integrated inverter, and the S pole of the field effect transistor VQ301 is connected to the transceiver switch circuit as a receiving control terminal (VKG1); in the other driving circuit, the connection point (RB) between the resistor R303 and the resistor R304 is connected to the external T / R control port through an integrated phase converter, and the S pole of the field effect transistor VQ301 is connected to the transceiver switch circuit as a transmitting control terminal (VKG2).

[0008] In the driving circuit of the present invention, RA and RB are connected to the external T / R control port through an integrated phase converter and an integrated phase inverter respectively, so the RA and RB signals are opposite.

[0009] When the RA / RB signal is low, the D and S poles of the field effect tubes VQ302 and VQ303 are both turned on, and the D and S poles of the field effect tube VQ301 are turned off; at this time, the output of VGK1 / VGK2 is a positive low voltage; when the RA / RB signal is high, the D and S poles of the field effect tubes VQ302 and VQ303 are both turned off, and the D and S poles of the field effect tube VQ301 are turned on; at this time, the output of VGK1 / VGK2 is a negative high voltage. Since the field effect tube itself has a short turn-on and turn-off time, which can reach less than 0.3us, and the diode D301 can accelerate the discharge, the driving circuit of this design can quickly switch the output signal state, effectively shorten the response time of the transceiver switch circuit, sensitively switch the transceiver state, and meet the communication requirements of fast response.

[0010] Preferably, the transceiver switch circuit includes a capacitor C404, a diode D403 and a capacitor C403 connected in sequence; wherein the capacitor C404 is connected to the segment selection switch; the capacitor C403 is connected to the antenna port; the connection between the capacitor C403 and the diode D403 is connected to the receiving port through the diode D404 and the capacitor C402 connected in series; the connection between the capacitor C403 and the diode D403 is also grounded through the inductor L404 and the resistor R401; the connection between the capacitor C404 and the diode D403 is connected to the transmitting control end of the driving circuit through the inductor L403; the transmitting control end of the driving circuit is grounded through the capacitor C401; the connection between the capacitor C402 and the diode D404 is connected to the receiving control end of the driving circuit through the inductor L401; the receiving control end of the driving circuit is grounded through the capacitor C405.

[0011] Preferably, both amplifier circuits include a pre-amplifier unit, a driver-amplifier unit and a final-amplifier unit connected in sequence; wherein the pre-amplifier unit is connected to the signal input port, and the final-amplifier unit is connected to the segment selection switch.

[0012] Preferably, the final stage amplifying unit comprises a radio frequency tube VQ1 and a radio frequency tube VQ2, and a matching distributed magnetic core cable transformer and a synthetic magnetic core cable transformer.

[0013] Preferably, the driver stage amplification unit is connected to the input of a distributed magnetic core cable transformer, and the two outputs of the distributed magnetic core cable transformer are respectively connected to the RF tube VQ1 and the RF tube VQ2; the RF tube VQ1 and the RF tube VQ2 are connected in series; the RF tube VQ1 and the RF tube VQ2 are respectively connected to the two inputs of the synthetic magnetic core cable transformer; the output of the synthetic magnetic core cable transformer is connected to a section selector switch.

[0014] The final stage amplification unit of the amplifier circuit of the present invention uses a distributed core cable transformer and a synthetic core cable transformer in conjunction with two radio frequency tubes, effectively reducing the total power consumption of the circuit and improving the efficiency of the circuit. For example, the present invention uses a 4:1 distributed core cable transformer and a synthetic core cable transformer; when the rated power is 105W, the final stage radio frequency tube outputs 110W, the efficiency is ≥83%, that is, the power consumption is about 133W; the power consumption of the driving stage amplification unit is about 5W; the remaining power consumption is about 3W; therefore, when the whole machine outputs 105W, the total power consumption is about 141W, and the total efficiency is ≥74%.

[0015] Preferably, it also includes a fixed-coupling detection circuit; the fixed-coupling detection circuit is connected at the connection between the section selection switch and the transceiver switch circuit.

[0016] Compared with the prior art, the present invention has the following advantages and beneficial effects:

[0017] 1. The driving circuit of the present invention can quickly switch the output signal state, effectively shorten the response time of the transceiver switch circuit, sensitively switch the transceiver state, and meet the communication requirements of fast response;

[0018] 2. The final amplifying unit of the amplifier circuit of the present invention uses a distributed magnetic core cable transformer and a synthetic magnetic core cable transformer in conjunction with two radio frequency tubes, which effectively reduces the total power consumption of the circuit and improves the circuit efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a structural block diagram of a short-wave radio frequency communication fast response transceiver circuit of the present invention;

[0020] Figure 2 It is a circuit principle diagram of a driving circuit in a short-wave radio frequency communication fast response transceiver circuit of the present invention;

[0021] Figure 3 It is a circuit principle diagram of a transceiver switch circuit in a short-wave radio frequency communication fast response transceiver circuit of the present invention;

[0022] Figure 4It is a circuit principle diagram of an amplifier circuit in a short-wave radio frequency communication fast response transceiver circuit of the present invention;

[0023] Figure 5 This is a structural block diagram of a shortwave radio frequency communication fast response transceiver circuit of Embodiment 2;

[0024] Figure 6 It is a circuit schematic diagram of a pulse width duty ratio protection circuit in a shortwave radio frequency communication fast response transceiver circuit of embodiment 2. DETAILED DESCRIPTION

[0025] The present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0026] Embodiment 1

[0027] like Figures 1 to 4 As shown, the present embodiment is a shortwave radio frequency communication fast response transceiver circuit, including two-way amplification circuit, a segment selection switch, a transceiver switch circuit and a power supply module for power supply; the two-way amplification circuit is connected to the segment selection switch to achieve that one of the amplification circuits is turned on and the other amplification circuit is turned off; the segment selection switch is connected to the receiving port or to the antenna port through the transceiver switch circuit.

[0028] The transceiver switch circuit is connected to two drive circuits with the same structure; the two drive circuits include field effect tube VQ301, field effect tube VQ302 and field effect tube VQ303; the G pole of field effect tube VQ301 is connected to the D pole of field effect tube VQ302, and is connected to the D pole of field effect tube VQ301 through a series resistor R301 and a resistor R302, and is also connected to the D pole of field effect tube VQ303 through a parallel diode D301 and an inductor L301. ; The S pole of the field effect tube VQ301 is connected to the D pole of the field effect tube VQ303 and is grounded through the capacitor C301; the G pole of the field effect tube VQ302 is connected to the G pole of the field effect tube VQ303 through the series resistor R303 and the resistor R304; the S pole of the field effect tube VQ302 is connected to the S pole of the field effect tube VQ303 and is connected to the positive low voltage (+5V); the connection between the resistor R301 and the resistor R302 is connected to the negative high voltage (-200V);

[0029] In one of the driving circuits, the connection point (RA) between the resistor R303 and the resistor R304 is connected to the external T / R control port through an integrated inverter, and the S pole of the field effect transistor VQ301 is connected to the transceiver switch circuit as a receiving control terminal (VKG1); in the other driving circuit, the connection point (RB) between the resistor R303 and the resistor R304 is connected to the external T / R control port through an integrated phase converter, and the S pole of the field effect transistor VQ301 is connected to the transceiver switch circuit as a transmitting control terminal (VKG2).

[0030] In the driving circuit of the present invention, RA and RB are connected to the external T / R control port through an integrated phase-matching device and an integrated phase-inverting device respectively, so the RA and RB signals are opposite. The integrated phase-matching device and the integrated phase-inverting device can adopt the existing technology.

[0031] When the RA / RB signal is at a low level, the D and S poles of the field effect tubes VQ302 and VQ303 are both turned on, and the D and S poles of the field effect tube VQ301 are turned off; at this time, the output of VGK1 / VGK2 is a positive low voltage; when the RA / RB signal is at a high level, the D and S poles of the field effect tubes VQ302 and VQ303 are both turned off, and the D and S poles of the field effect tube VQ301 are turned on; at this time, the output of VGK1 / VGK2 is a negative high voltage. Since the field effect tube itself has a short turn-on and turn-off time, which can reach less than 0.3us, and the diode D301 can accelerate the discharge, the driving circuit of the design can quickly switch the output signal state, effectively shortening the response time of the transceiver switch circuit; the response time of the transceiver switch circuit of the present invention can reach less than 4us. The present invention can sensitively switch the transceiver state to meet the communication requirements of fast response.

[0032] The transceiver switch circuit includes a capacitor C404, a diode D403 and a capacitor C403 connected in sequence; wherein the capacitor C404 is connected to the segment selection switch; the capacitor C403 is connected to the antenna port; the connection between the capacitor C403 and the diode D403 is connected to the receiving port through the diode D404 and the capacitor C402 connected in series; the connection between the capacitor C403 and the diode D403 is also grounded through the inductor L404 and the resistor R401; the connection between the capacitor C404 and the diode D403 is connected to the transmitting control end of the driving circuit through the inductor L403; the transmitting control end of the driving circuit is grounded through the capacitor C401; the connection between the capacitor C402 and the diode D404 is connected to the receiving control end of the driving circuit through the inductor L401; the receiving control end of the driving circuit is grounded through the capacitor C405.

[0033] The two-way amplifier circuits each include a pre-amplifier unit, a push-stage amplifier unit and a final amplifier unit connected in sequence; wherein the pre-amplifier unit is connected to the signal input port, and the final amplifier unit is connected to the section selection switch. The pre-amplifier unit and the push-stage amplifier unit can adopt existing technology.

[0034] The radio frequency device includes a radio frequency amplification module U1 and a radio frequency tube; wherein the radio frequency amplification module is located in the front stage amplification unit, and the radio frequency tube is located in the final stage amplification unit.

[0035] The final stage amplifying unit has two radio frequency tubes, namely radio frequency tube VQ1 and radio frequency tube VQ2; the final stage amplifying unit also includes a matching distributed core cable transformer and a synthetic core cable transformer;

[0036] The driving stage amplifying unit is connected to the input of the distributed magnetic core cable transformer, and the two outputs of the distributed magnetic core cable transformer are respectively connected to the radio frequency tube VQ1 and the radio frequency tube VQ2; the radio frequency tube VQ1 and the radio frequency tube VQ2 are connected in series; the radio frequency tube VQ1 and the radio frequency tube VQ2 are respectively connected to the two inputs of the synthetic magnetic core cable transformer; the output of the synthetic magnetic core cable transformer is connected to the section switch.

[0037] The final amplifier unit of the amplifier circuit of the present invention uses a distributed core cable transformer and a synthetic core cable transformer in conjunction with two radio frequency tubes, which effectively reduces the total power consumption of the circuit and improves the efficiency of the circuit. For example, the present invention uses a 4:1 distributed core cable transformer and a synthetic core cable transformer; when the rated power is 105W, the final radio frequency tube outputs 110W, and the efficiency is ≥83%, that is, the power consumption is about 133W; the power consumption of the driving stage amplifier unit is about 5W; the remaining power consumption is about 3W; therefore, when the whole machine outputs 105W, the total power consumption is about 141W, and the total efficiency is ≥74%. The distributed core cable transformer and the synthetic core cable transformer can be composed of baluns.

[0038] The transceiver circuit preferably also includes a fixed-coupling detection circuit; the fixed-coupling detection circuit is connected at the connection between the section selection switch and the transceiver switch circuit.

[0039] Embodiment 2

[0040] This embodiment is a short-wave radio frequency communication fast response transceiver circuit, which is different from the first embodiment in that: in this embodiment, Figure 5 and Figure 6 As shown, the short-wave radio frequency communication fast response transceiver circuit also includes a pulse width duty cycle protection circuit. The input end of the pulse width duty cycle protection circuit is connected to the power supply module through the current detection module to collect the total output current value of the power supply module; the pulse width duty cycle protection circuit is used to integrate and judge the current value collected by the current detection module, and output a shutdown signal when the pulse width or duty cycle is greater than the set value; the output end of the pulse width duty cycle protection circuit is connected to the radio frequency devices of the two amplifier circuits through the PTT module. The radio frequency devices include radio frequency amplifier module U1, radio frequency tube VQ1 and radio frequency tube VQ2.

[0041] During the communication process or product testing process, the pulse width duty cycle may be too high, and even continuous wave operation may occur; however, the existing shortwave communication transceiver circuit lacks pulse width duty cycle protection; if the pulse width and duty cycle are too high, the RF device will be overloaded, and the heat will be generated quickly without being able to be discharged in time, which may easily burn out the RF device and hinder the reliable operation of the circuit. The present invention adds a pulse width duty cycle protection circuit, which integrates and analyzes the current value of the power supply module collected by the current detector, and outputs a shutdown signal to stop the RF device of the amplifier circuit and turn off the power amplifier function when the pulse width or duty cycle is greater than the set value; after the heat is released, the RF device is started to start the power amplifier to achieve pulse width duty cycle protection; pulse width duty cycle protection can prevent the RF device from overheating and burning due to excessive pulse width or duty cycle, thereby improving the circuit operation reliability.

[0042] The pulse width duty ratio protection circuit comprises a comparator integration module and a triode amplification module which are connected in sequence.

[0043] Specifically, the comparator integration module includes a comparator A1, a comparator A2, a NAND gate G1 and a NAND gate G2; the transistor amplification module includes a transistor Q201.

[0044] The input end of the pulse width duty ratio protection circuit is connected to the positive input of the comparator A1, and the negative input of the comparator A1 is connected to the comparison voltage 1 (the voltage at the connection point of the resistors R203 and R204); the output end of the comparator A1 is connected to the negative input of the comparator A2 through the diode D201, the positive input of the comparator A2 is connected to the comparison voltage 2 (the voltage at the connection point of the resistors R207 and R208), and the positive input of the comparator A2 is also connected to the output end of the comparator A2 through the resistor R209; the output end of the comparator A1 is also connected to the input end 1 of the NAND gate G1 and the NAND gate G2; the input end 2 of the NAND gate G2 is connected to the output end of the comparator A2, and the output end of the NAND gate G2 is connected to the negative input of the comparator A2 through the diode D202 and the resistor R205 connected in series; the negative input of the comparator A2 is connected to the output end of the comparator A2 through the resistor R206 and the diode D203 connected in series; the output end of the comparator A2 is connected to the PTT module through the transistor Q201. The pulse width duty cycle protection circuit can effectively realize the pulse width duty cycle protection function.

[0045] The PTT module is respectively connected to the RF amplification module U1 of the front-stage amplification unit and the RF tube VQ1 and RF tube VQ2 of the final-stage amplification unit of the two-way amplification circuit (such as Figure 4 Middle interface vg) connection.

[0046] The rest of the structure of this embodiment is the same as that of the first embodiment.

[0047] The above embodiments are preferred implementation modes of the present invention, but the implementation modes of the present invention are not limited to the above embodiments. Any other changes, modifications, substitutions, combinations, and simplifications that do not deviate from the spirit and principles of the present invention should be equivalent replacement methods and are included in the protection scope of the present invention.

Claims

1. A shortwave radio frequency communication fast response transceiver circuit, characterized in that: It includes two-way amplification circuit, a section switch and a transceiver switch circuit; the two-way amplification circuit is respectively connected to the section switch; the section switch is respectively connected to the receiving port and the antenna port through the transceiver switch circuit to realize the switching of receiving and transmitting functions; The transceiver switch circuit is connected to two drive circuits with the same structure; The two driving circuits both include a field effect tube VQ301, a field effect tube VQ302 and a field effect tube VQ303; the G pole of the field effect tube VQ301 is connected to the D pole of the field effect tube VQ302, and is connected to the D pole of the field effect tube VQ301 through a series resistor R301 and a resistor R302, and is also connected to the D pole of the field effect tube VQ303 through a parallel diode D301 and an inductor L301; the S pole of the field effect tube VQ301 is connected to the D pole of the field effect tube VQ303, and is grounded through a capacitor C301; the G pole of the field effect tube VQ302 is connected to the G pole of the field effect tube VQ303 through a series resistor R303 and a resistor R304; the S pole of the field effect tube VQ302 is connected to the S pole of the field effect tube VQ303, and is connected to a positive low voltage; the connection between the resistor R301 and the resistor R302 is connected to a negative high voltage; In one of the driving circuits, the connection between the resistor R303 and the resistor R304 is connected to the external T / R control port through an integrated inverter, and the S pole of the field effect transistor VQ301 is connected to the transceiver switch circuit as a receiving control terminal; in the other driving circuit, the connection between the resistor R303 and the resistor R304 is connected to the external T / R control port through an integrated phase converter, and the S pole of the field effect transistor VQ301 is connected to the transceiver switch circuit as a transmitting control terminal; The transceiver switch circuit includes a capacitor C404, a diode D403 and a capacitor C403 connected in sequence; wherein the capacitor C404 is connected to the section selection switch; the capacitor C403 is connected to the antenna port; the connection between the capacitor C403 and the diode D403 is connected to the receiving port through the diode D404 and the capacitor C402 connected in series; the connection between the capacitor C403 and the diode D403 is also grounded through the inductor L404 and the resistor R401; the connection between the capacitor C404 and the diode D403 is connected to the transmitting control end of the drive circuit through the inductor L403; the transmitting control end of the drive circuit is grounded through the capacitor C401; the connection between the capacitor C402 and the diode D404 is connected to the receiving control end of the drive circuit through the inductor L401; the receiving control end of the drive circuit is grounded through the capacitor C405; Both amplifier circuits include a pre-amplifier unit, a driver-amplifier unit and a final-amplifier unit connected in sequence; wherein the pre-amplifier unit is connected to the signal input port, and the final-amplifier unit is connected to the section selection switch.

2. The shortwave radio frequency communication fast response transceiver circuit according to claim 1, characterized in that: The final stage amplifying unit includes a radio frequency tube VQ1 and a radio frequency tube VQ2, and a matching distributed magnetic core cable transformer and a synthetic magnetic core cable transformer.

3. The shortwave radio frequency communication fast response transceiver circuit according to claim 2, characterized in that: The driving stage amplifying unit is connected to the input of the distributed magnetic core cable transformer, and the two outputs of the distributed magnetic core cable transformer are respectively connected to the radio frequency tube VQ1 and the radio frequency tube VQ2; the radio frequency tube VQ1 and the radio frequency tube VQ2 are connected in series; the radio frequency tube VQ1 and the radio frequency tube VQ2 are respectively connected to the two inputs of the synthetic magnetic core cable transformer; the output of the synthetic magnetic core cable transformer is connected to the section selection switch.

4. The shortwave radio frequency communication fast response transceiver circuit according to any one of claims 1 to 3, characterized in that: It also includes a fixed-coupling detection circuit; the fixed-coupling detection circuit is connected to the connection between the section selection switch and the transceiver switch circuit.

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