A multi-scene universal agile frequency component

Abstract

The utility model discloses a kind of multi-scene general agile frequency components.Medium-frequency circuit is responsible for filtering, amplifying intermediate frequency signal;Frequency hopping communication is realized using double mixer scheme in mixing frequency circuit, and two-way band-pass filtering is used in radio frequency circuit, and different radio frequency frequency is realized using by adjusting the passband frequency of each band-pass filter.Single set of component using this architecture can realize agile frequency communication under TDD mode, and communication demand under FDD can be realized using two sets of component using this architecture.The utility model combines existing device resources and process level, utilizes the performance characteristics of mixer, numerical control attenuator, radio frequency switch and bidirectional amplifier, and builds a kind of agile frequency general architecture supporting two communication modes of TDD and FDD.Compared with other agile frequency component architectures, the complexity and cost of component are reduced, the reliability of agile frequency component is improved, the design complexity is reduced, and it is suitable for a variety of scene applications.

Description

Technical Field

[0001] This utility model relates to a versatile frequency agile component applicable to multiple scenarios, specifically a frequency agile component suitable for frequency division duplex and time division duplex communication architectures. It can provide design references for both the transmitting and receiving channels of the frequency agile component and has advantages such as simple structure and high reliability. Background Technology

[0002] With the advancement of modern communication technology, communication equipment is developing towards greater diversity, lighter weight, lower cost, and flexible networking, which places increasingly higher demands on the design of various modules in communication systems. Frequency agile components, as core components of anti-interference communication equipment, often employ frequency hopping technology to improve their noise and tracking immunity. As communication systems develop year by year, the requirements for frequency hopping rates and data transmission rates are becoming increasingly stringent. This necessitates that frequency agile components have simpler structures and lower costs to meet the current demands for miniaturized, low-cost, and wide-coverage equipment.

[0003] On the one hand, communication equipment is becoming increasingly miniaturized, while superheterodyne inverter architecture remains the mainstream design solution for frequency agile components. In FDD communication mode, the up-conversion and down-conversion channels of superheterodyne inverter components need to be designed independently. If one channel fails, the entire component is damaged, severely impacting equipment reliability. On the other hand, in TDD communication mode, the link also needs to be redesigned, making it impossible to achieve universality in component architecture.

[0004] On the other hand, to achieve microsecond (µs) frequency hopping rates, existing frequency agile components often employ ping-pong loop frequency hopping, including phase-locked loop (PLL) technology, direct digital frequency synthesis (DDS) technology, and hybrid frequency synthesis technology (PLL+DDS). For example... Figure 1 The diagram shows a frequency-agile transmit link using ping-pong phase-locked loop (PLL) technology. At frequency 1, PLL1 is locked, and the corresponding switch is open. When frequency switching is needed, PLL2 is already locked at the corresponding frequency, requiring only the opening of the appropriate ping-pong switch. Since the switching time of the ping-pong switch is only in the nanosecond range (ns), the frequency hopping rate can meet the requirements. However, this ping-pong switching method suffers from severe load-pull problems, with output power fluctuating drastically with frequency, leading to unstable communication link quality. Using direct digital frequency synthesis (DDS) technology to provide the local oscillator frequency for the frequency-agile components has significant advantages: high frequency resolution, fast frequency switching time, good stability, and low phase noise. However, its main drawback is the low output frequency, which leads to issues such as… Figure 2 The link structure shown uses DDS to perform fractional frequency division, which can achieve fast loop locking. However, this design increases the amount of consumables, increases the complexity of the system, and cannot completely solve the load traction problem. Utility Model Content

[0005] To address the aforementioned shortcomings in existing technologies, there is an urgent need for a fast frequency conversion component architecture that is clearly structured, simple in design, and applicable to multiple scenarios. This invention primarily provides a fast frequency conversion component architecture that is compatible with both TDD and FDD communication systems, supports frequency hopping communication, and features identical up-conversion and down-conversion structures. While solving the aforementioned problems, it also boasts advantages such as simple design, low complexity, controllable cost, and high reliability, making it suitable for various application scenarios.

[0006] To achieve the above functions, the specific implementation scheme of this utility model is as follows: A versatile frequency-agile component for multiple scenarios includes an intermediate frequency circuit, a mixer circuit, a radio frequency circuit, and a reference input circuit. The intermediate frequency circuit and the radio frequency circuit are connected through a mixer circuit; the reference input circuit is connected to the mixer circuit to provide a reference signal for the mixer circuit. The intermediate frequency (IF) circuit includes a first IF bandpass filter, an IF bidirectional amplifier, a digitally controlled attenuator, and a second IF bandpass filter. The first port of the first bandpass filter is used for either the input or output of the IF signal, and the second port is connected to the common port of the first IF switch. The two switching ports of the first IF switch are connected to the two switching ports of the second IF switch via the IF bidirectional amplifier. The common port of the second IF switch is connected to the second IF bandpass filter via the digitally controlled attenuator. The mixing circuit includes a first mixing switch, a first mixer, a second mixer, a first local oscillator, a second local oscillator, and a second mixing switch. The common port of the first mixing switch is connected to the intermediate frequency circuit, and its two switching ports are connected to the first mixer and the second mixer, respectively. The first mixer is connected to the first local oscillator and receives the local oscillator signal provided by the first local oscillator. The second mixer is connected to the second local oscillator and receives the local oscillator signal provided by the second local oscillator. The common port of the second mixing switch is connected to the radio frequency circuit, and its two switching ports are connected to the first mixer and the second mixer, respectively. The radio frequency circuit includes a first radio frequency bandpass filter, a radio frequency branch, a first radio frequency switch, and a second radio frequency switch; the first port of the first radio frequency bandpass filter is connected to the mixer circuit, and the second port is connected to the common terminal of the first radio frequency switch; the two switching ports of the first radio frequency switch are respectively connected to the two switching ports of the second radio frequency switch corresponding to the radio frequency branch, and the common port of the second radio frequency switch is used for radio frequency input or output.

[0007] Furthermore, the radio frequency branch includes a radio frequency bidirectional amplifier, a second radio frequency bandpass filter, a third radio frequency switch, and a fourth radio frequency switch; The common port of the third RF switch is connected to one of the switching ports of the first RF switch; the two switching ports of the third RF switch are connected to the two switching ports of the fourth RF switch through a bidirectional RF amplifier; the common port of the fourth RF switch is connected to the first port of the second RF bandpass filter, and the second port of the second bandpass filter is connected to one of the switching ports of the second RF switch.

[0008] Furthermore, the intermediate frequency bidirectional amplifier and the radio frequency bidirectional amplifier include two amplifiers, which are arranged in opposite directions.

[0009] Furthermore, it also includes a reference input short circuit and a microcontroller; The reference input circuit is connected to the first local oscillator and the second local oscillator respectively through a power divider to provide clock reference for both; the microcontroller receives control signals at one end and is connected to a switch at the other end to provide control logic for the internal switch.

[0010] Compared with the prior art, the present invention has the following beneficial effects: The variable frequency drive component architecture of this utility model has all components with bidirectional signal transmission characteristics, and the up and down conversion adopts the same structure, which is compatible with both transmitting and receiving.

[0011] The frequency-agile component architecture of this invention is compatible with TDD or FDD communication.

[0012] The frequency agile component architecture of this invention allows for TDD communication using only a single path. By switching the amplification direction of the bidirectional amplifier signals in the intermediate frequency circuit and the radio frequency circuit according to the time slot requirements, the TDD communication needs can be met. The other path can serve as a backup, thereby improving the reliability of the equipment.

[0013] The frequency agile component architecture of this utility model uses two sets of the architecture when FDD communication is used. The two sets of the architecture work in transmit and receive modes respectively, thus completing the frequency agile transceiver function in frequency division duplex mode.

[0014] This invention presents a frequency-agile component architecture. The mixing circuit employs a dual-mixer scheme to achieve frequency-hopping communication. Since the switching involves the RF switches before and after the mixer, the structure is symmetrical and stable, eliminating the load-pulling problem caused by traditional ping-pong frequency-hopping switching methods. The RF switches have higher suppression for lower intermediate frequency (IF) frequencies, effectively reducing the isolation between the IF and local oscillator, and further reducing mixing spurious emissions. Overall, this architecture is simple in structure and low in cost.

[0015] The frequency agile component architecture of this utility model adopts a dual mixer scheme to realize frequency hopping communication. Even if one local oscillator fails, the other local oscillator can be switched to work, and the system can still keep the frequency agile component working in a fixed frequency working state, maintain equipment communication, and improve the equipment's resilience. Attached Figure Description

[0016] The accompanying drawings, which are included to provide a further understanding of this application and form part of this application, illustrate exemplary embodiments and are used to explain this application, but do not constitute an undue limitation of this application. In the drawings: Figure 1 This is a diagram of a ping-pong phase-locked loop structure for frequency conversion.

[0017] Figure 2 This is a diagram of a frequency converter structure using a DDS combined with a ping-pong phase-locked loop.

[0018] Figure 3 This is a basic structural diagram of the present invention.

[0019] Figure 4 This is a schematic diagram illustrating the working principle of precise time synchronization of this utility model.

[0020] Figure 5 This is a schematic diagram of the communication principle of the frequency division duplex single-mode device of this utility model. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of this application clearer, the technical solutions of this application will be clearly and completely described below in conjunction with specific embodiments and corresponding drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0022] A versatile frequency-agile inverter component architecture, with the following basic structure: Figure 3 As shown, it consists of several parts, including an intermediate frequency circuit, a mixer circuit, an RF circuit, a power supply, a microcontroller, and a reference input circuit. The detailed structure is as follows: Figure 4 As shown, the intermediate frequency (IF) circuit includes a first IF bandpass filter, an IF bidirectional amplifier, a digitally controlled attenuator, and a second IF bandpass filter; the mixer circuit includes a first mixer switch, a first mixer, a second mixer, a first local oscillator, a second local oscillator, and a second mixer switch; the radio frequency (RF) circuit includes a first RF bandpass filter, a first RF switch, a first RF bidirectional amplifier, a second RF bandpass filter, a second RF bidirectional amplifier, and a second RF switch; the reference input circuit provides a clock reference to the local oscillator through a power divider; and the control signal provides the control logic program for the internal components through a microcontroller.

[0023] In transmit mode, the signal is input through the intermediate frequency (IF) input port, filtered by the first IF filter, and then amplified by the IF bidirectional amplifier. The amplified signal is attenuated by a digitally controlled attenuator, then filtered by the second IF bandpass filter. The filtered IF signal passes through the first mixer switch and is then mixed with the first local oscillator (or with the second local oscillator) in the first mixer. The resulting radio frequency (RF) signal passes through the second mixer switch and enters the first RF filter. The RF signal, after being filtered by the first RF filter, enters the first RF switch, is amplified by the first RF bidirectional amplifier, and then filtered by the second RF bandpass filter (or amplified by the second RF bidirectional amplifier and then filtered by the third RF bandpass filter). Finally, the desired RF signal is output via the second RF switch. (Details follow...) Figure 5 As shown.

[0024] In the receiving mode, the signal enters through the RF input port, is selected by the second RF switch, then filtered by the second RF bandpass filter, and amplified by the first RF bidirectional amplifier (or filtered by the third RF bandpass filter and amplified by the second RF bidirectional amplifier). The amplified RF signal then passes through the first RF switch and is filtered by the first RF filter. The filtered RF signal first enters the second mixer switch, and then is mixed with the first local oscillator in the second mixer (or mixed with the second local oscillator in the second mixer). The resulting intermediate frequency (IF) signal passes through the first mixer switch and enters the IF single channel. The IF signal generated by the downconversion enters the second IF bandpass filter, then enters the digitally controlled attenuator to attenuate the received signal as required by the equipment, then is amplified by the IF bidirectional amplifier, and finally filtered by the first IF filter before being output from the IF output port as the required IF signal. Specifically... Figure 5 As shown.

[0025] All components of this invention have bidirectional signal transmission characteristics. The up and down conversion adopt the same structure. All components in the architecture, such as mixers, digitally controlled attenuators, RF switches, and bidirectional amplifiers, have bidirectional transmission characteristics and can simultaneously meet the needs of receiving or transmitting.

[0026] This invention relates to a mixing circuit consisting of a first mixing RF switch and a second mixing RF switch, forming two mixing circuits, each corresponding to a local oscillator. When used for frequency hopping communication, the two RF switches in the mixing circuit are controlled to receive the mixing signals for local oscillator 1 and local oscillator 2 respectively, according to the communication time slot. Since the switching involves the RF switches before and after the mixer, the structure is symmetrical and stable, eliminating the load-pull problem associated with traditional ping-pong frequency hopping switching. The RF switches offer higher suppression of lower intermediate frequency (IF) frequencies, effectively reducing the isolation between the IF and local oscillator, further reducing mixing spurious signals. If either local oscillator fails, only the other local oscillator can be switched to operate, and the system can still maintain fixed-frequency communication, improving system resilience.

[0027] This invention modularizes the frequency conversion architecture, leaving necessary control and power supply interfaces, thus enabling flexible construction of frequency conversion components. In TDD communication mode, one unit of this architecture is used, and in FDD communication mode, two sets of this architecture units are used.

[0028] When this invention is used as a frequency agile component in TDD mode, the second and third RF bandpass filters have the same bandwidth. The RF circuit can use either RF branch, while the other RF branch is used as a backup, thereby improving the reliability of the equipment.

[0029] When this utility model is used as a frequency agile component in FDD mode, the bandwidth of the first radio frequency filter covers the two radio frequency bands of FDD communication, and the passband frequencies of the second and third radio frequency bandpass filters are different, switching between any one frequency band to work according to the transmit / receive status.

[0030] The working principle of this utility model is as follows: The frequency-agile component using this novel architecture operates in frequency division duplex mode. The microcontroller, powered by a RAM chip, primarily controls the logic of all switches and bidirectional amplifiers in the architecture, and performs timing control on local oscillators 1 and 2 in the mixer circuit. The reference input provides a stable clock frequency to the local oscillators through a power divider. The power supply provides a stable, linear, and reliable power source for the entire intermediate frequency circuit, RF circuit, mixer circuit, and processing control unit. It linearly regulates and filters the power supplied from the interface circuit, outputting different voltages. The specific circuit structure is as follows... Figure 5 As shown below, the details are as follows: In transmit mode, the signal is input through the intermediate frequency (IF) input port, filtered by the first IF filter, and then amplified by the IF bidirectional amplifier. The amplified signal is attenuated by a digitally controlled attenuator, then filtered by the second IF bandpass filter. The filtered IF signal passes through the first mixer switch and is then mixed with the first local oscillator (or with the second local oscillator) in the first mixer. The resulting radio frequency (RF) signal passes through the second mixer switch and enters the first RF filter. The RF signal, after being filtered by the first RF filter, enters the first RF switch, is amplified by the first RF bidirectional amplifier, and then filtered by the second RF bandpass filter (or amplified by the second RF bidirectional amplifier and then filtered by the third RF bandpass filter). Finally, the desired RF signal is output via the second RF switch.

[0031] In receiving mode, the signal enters through the RF input port, is selected by the second RF switch, and then filtered by the second RF bandpass filter before being amplified by the first RF bidirectional amplifier (or filtered by the third RF bandpass filter and then amplified by the second RF bidirectional amplifier). The amplified RF signal then passes through the first RF switch and is filtered by the first RF filter. The filtered RF signal first enters the second mixer switch, and then is mixed with the first local oscillator in the second mixer (or mixed with the second local oscillator in the second mixer). The resulting intermediate frequency (IF) signal passes through the first mixer switch and enters the IF single channel. The IF signal generated by downconversion is filtered by the second IF bandpass filter, then enters the digitally controlled attenuator to attenuate the received signal as required by the equipment. The signal is then amplified by the IF bidirectional amplifier, filtered again by the first IF filter, and finally output as the required IF signal from the IF output port.

Claims

1. A versatile frequency-agile component, comprising an intermediate frequency circuit, a mixer circuit, a radio frequency circuit, and a reference input circuit; characterized in that, The intermediate frequency circuit and the radio frequency circuit are connected through a mixer circuit; the reference input circuit is connected to the mixer circuit to provide a reference signal for the mixer circuit. The intermediate frequency circuit includes a first intermediate frequency bandpass filter, an intermediate frequency bidirectional amplifier, a digitally controlled attenuator, and a second intermediate frequency bandpass filter; the first port of the first bandpass filter is used for the input or output of the intermediate frequency signal, and the second port is connected to the common port of the first intermediate frequency switch; The two switching ports of the first intermediate frequency switch are connected to the two switching ports of the second intermediate frequency switch through an intermediate frequency bidirectional amplifier; the common port of the second intermediate frequency switch is connected to the second intermediate frequency bandpass filter through a digitally controlled attenuator. The mixing circuit includes a first mixing switch, a first mixer, a second mixer, a first local oscillator, a second local oscillator, and a second mixing switch; the common port of the first mixing switch is connected to the intermediate frequency circuit, and the two switching ports are respectively connected to the first mixer and the second mixer; the first mixer is connected to the first local oscillator and receives the local oscillator signal provided by the first local oscillator; The second mixer is connected to the second local oscillator and receives the local oscillator signal provided by the second local oscillator; the common port of the second mixer switch is connected to the radio frequency circuit, and the two switching ports are respectively connected to the first mixer and the second mixer; The radio frequency circuit includes a first radio frequency bandpass filter, a radio frequency branch, a first radio frequency switch, and a second radio frequency switch; the first port of the first radio frequency bandpass filter is connected to the mixer circuit, and the second port is connected to the common terminal of the first radio frequency switch; the two switching ports of the first radio frequency switch are respectively connected to the two switching ports of the second radio frequency switch corresponding to the radio frequency branch, and the common port of the second radio frequency switch is used for radio frequency input or output.

2. The multi-scenario universal frequency agile component according to claim 1, characterized in that, The radio frequency branch includes a radio frequency bidirectional amplifier, a second radio frequency bandpass filter, a third radio frequency switch, and a fourth radio frequency switch; The common port of the third RF switch is connected to one of the switching ports of the first RF switch; the two switching ports of the third RF switch are connected to the two switching ports of the fourth RF switch through a bidirectional RF amplifier; the common port of the fourth RF switch is connected to the first port of the second RF bandpass filter, and the second port of the second bandpass filter is connected to one of the switching ports of the second RF switch.

3. The multi-scenario universal frequency agile component according to claim 2, characterized in that, The intermediate frequency bidirectional amplifier and the radio frequency bidirectional amplifier each include two amplifiers, which are arranged in opposite directions.

4. The multi-scenario universal frequency agile component according to claim 1, characterized in that, It also includes a reference input short circuit and a microcontroller; The reference input circuit is connected to the first local oscillator and the second local oscillator respectively through a power divider, providing clock reference for both. The microcontroller receives control signals at one end and connects to a switch at the other end, providing control logic for the internal switch.

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