A power adaptive link allocation front-end receiving component

Abstract

The present invention provides a power adaptive link allocation front-end receiving component, which mainly includes a front-end radio frequency circuit module, a detection signal operation circuit module, a radio frequency signal amplification circuit module, and an output power adjustment circuit module. A large-dynamic detector is used to detect the signal of the radio frequency receiving front-end to obtain a power-related level signal, and then the level signal is amplified by an operational amplifier. Then, according to the reference level set for radio frequency signals with different powers, the control level of the single-pole triple-throw switch in the subsequent circuit is automatically converted, and then different back-end signal processing links are selected to complete the signal processing function of the front-end receiving component, and finally the adaptive allocation feature of the receiving front-end is realized. The present invention can realize adaptive link allocation according to the magnitude of the radio frequency input power, and has the advantages of adaptive implementation, large dynamic range, high detection sensitivity, etc.

Description

Technical Field

[0001] The present invention belongs to the technical field of microwave measurement, and particularly relates to a front-end receiving component with power adaptive link allocation. Background Art

[0002] Microwave front-end receiving components play an extremely important role in the field of microwave detection. Low noise figure, large dynamic range, wide operating frequency band, and the ability to adaptively allocate links are several important directions for the current development of microwave front-ends. Existing front-end receiving components often use a single-channel RF link to receive signals and do not have the function of adaptively allocating links according to the power of the received RF signal. Summary of the Invention

[0003] In order to overcome the deficiencies of the prior art, the present invention provides a front-end receiving component with power adaptive link allocation. It mainly includes a front-end RF circuit module, a detected signal operation circuit module, an RF signal amplification circuit module, and an output power adjustment circuit module. A large-dynamic detector is used to detect the signal of the RF receiving front-end to obtain a power-related level signal, and then the level signal is amplified by an operational amplifier. Then, according to the reference levels set for RF signals of different powers, the control level of the single-pole triple-throw switch in the subsequent circuit is automatically converted, and different back-end signal processing links are selected to complete the signal processing function of the front-end receiving component, and finally the characteristics of adaptive allocation of the receiving front-end are realized. The present invention can realize adaptive link allocation according to the size of the RF input power, and has the advantages of adaptive implementation, large dynamic range, high detection sensitivity, etc.

[0004] A front-end receiving component with power adaptive link allocation, characterized in that it includes a front-end RF circuit module, a detected signal operation circuit module, an RF signal amplification circuit module, and an output power adjustment circuit module;

[0005] Among them, the front-end RF circuit module receives the input RF signal, which passes through a filter, a limiter, and a directional coupler in sequence, and the signal is divided into two paths. One path of the RF signal passing through the through-end of the coupler passes through a digital controlled attenuator, a low-noise figure amplifier, and a single-pole triple-throw switch and then is output to the 3-channel RF signal amplification circuit module. The other path of the RF signal passing through the coupled port of the coupler passes through an amplifier and an attenuator and then is output to the detected signal operation circuit module;

[0006] The detected signal operation circuit module amplifies and attenuates and adjusts the power of the RF signal passing through the coupled port of the directional coupler of the front-end RF circuit module, and then passes through a large-dynamic detector and an operational amplifier, and then passes through a first comparator and a second comparator respectively, and different control signals are obtained by comparing with two different reference voltages to control the switching of the single-pole triple-throw switch in the front-end RF circuit module;

[0007] The 3-channel RF signal amplification circuit module includes a low-power signal processing circuit, a medium-power signal processing circuit, and a high-power signal processing circuit, which respectively perform signal amplification and attenuation processing through the cascading of several stages of amplifiers and digital control attenuators. Among them, the low-power signal processing circuit receives and processes RF signals with a power range of -100 to -50 dBm, the medium-power signal processing circuit receives and processes RF signals with a power range of -50 to 0 dBm, and the high-power signal processing circuit receives and processes RF signals with a power range of 0 to +20 dBm;

[0008] The output power adjustment circuit module amplifies the three-way signals output by the received RF signal amplification circuit module. First, it selects one of the three-way signals for output through a single-pole triple-throw switch, and then passes through a power equalizer and an attenuator to achieve the function of linearly amplifying the low-power signal and saturating the output of the medium-power signal and the high-power signal.

[0009] Specifically, the low-power signal processing circuit is composed of a first amplifier (1), a second amplifier (2), a first digital control attenuator (3), a second digital control attenuator (4), a third amplifier (5), a fourth amplifier (6), and a third digital control attenuator (7).

[0010] Specifically, the medium-power signal processing circuit is composed of a first amplifier (8), a first digital control attenuator (9), a second amplifier (10), a third amplifier (11), a fourth amplifier (12), and a second digital control attenuator (13).

[0011] Specifically, the high-power signal processing circuit is composed of a first amplifier (14) and a first digital control attenuator (15).

[0012] The beneficial effects of the present invention are as follows: (1) In the detection signal operation circuit module, a large-dynamic detector is used to obtain level signals corresponding to different powers, and then the signals are amplified by an operational amplifier. Then, according to different reference levels set for radio frequency (RF) signals with different powers, the RF receiving link is automatically switched, enabling the adaptive allocation of the RF link and having a good effect of adaptive link allocation; (2) After the RF signal passes through the directional coupler, by adjusting the values of the amplifier and the attenuator, it can ensure that the large-dynamic detector operates in the linear amplification range. At the same time, by adjusting the gain of the operational amplifier, adjusting the logarithmic slope of the control operational amplifier circuit, and using a voltage divider circuit combining a voltage regulator and multiple resistors, an accurate reference voltage can be provided to improve the accuracy of power detection; (3) Through the digital control attenuator in the front-end RF circuit module, the power of the RF signal can be adjusted. By reducing the power entering the first-stage low-noise amplifier through the attenuator, while ensuring its operation in the linear working range, the overall linear dynamic range of the input components is extended, and the maximum extended dynamic range can reach 120 dB, with a large dynamic range; (4) Through the digital control attenuator, amplifier, and power equalizer of the three-channel RF signal amplification circuit module for amplitude adjustment and simultaneously adjusting the matching between links, an excellent flatness index can be obtained; (5) Through the selection of the pre-filter in the front-end RF circuit module and the directional coupler, amplifier, and detector in the detection operation circuit module, the broadband performance requirements of the receiving front-end components can be achieved, having a good effect of wide frequency band. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 is a schematic diagram of a power adaptive link allocation front-end receiving component of the present invention;

[0014] Figure 2 is a schematic diagram of the front-end RF circuit module;

[0015] Figure 3 is a schematic diagram of the detection signal operation circuit module;

[0016] Figure 4 is a schematic diagram of the small-power signal processing circuit;

[0017] Figure 5 is a schematic diagram of the medium-power signal processing circuit;

[0018] Figure 6 is a schematic diagram of the high-power signal processing circuit;

[0019] Figure 7 is a schematic diagram of the output power adjustment circuit module. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0020] The present invention will be further described below in conjunction with the drawings and embodiments. The present invention includes but is not limited to the following embodiments.

[0021] As Figure 1 shown, the present invention provides a power adaptive link allocation front-end receiving component, which mainly includes a front-end radio frequency circuit module, a detection signal operation circuit module, a radio frequency signal amplification circuit module, and an output power adjustment circuit module.

[0022] 1. Front-end radio frequency circuit module

[0023] As Figure 2 shown, the front-end radio frequency circuit module receives the input radio frequency signal and selects the radio frequency operating bandwidth through a pre-filter. In order to ensure the wide frequency band operation of the component, it is generally set in the reverse direction. According to the radio frequency bandwidth of the specific input signal, the corresponding broadband filter can be selected to achieve this.

[0024] Then, the limiter is used to ensure that the power of the radio frequency input signal is less than a threshold (generally, the limiter power is set to 15 dBm) to protect the subsequent low-noise amplifier from being damaged by directly receiving high-power signals. Then, the radio frequency signal is divided into two paths through a directional coupler. One path, that is, the video signal passing through the through-end of the directional coupler, first undergoes dynamic power expansion through a digital controlled attenuator, and then the low-noise coefficient amplifier is used to amplify the radio frequency signal while ensuring a low noise coefficient. Finally, it is output to the 3-way radio frequency signal amplification circuit module after passing through a single-pole triple-throw switch; the other path signal, that is, the radio frequency signal passing through the coupled-end of the coupler, enters the detection signal operation circuit module.

[0025] 2. Detection signal operation circuit module

[0026] As Figure 3 shown, after the detection signal operation circuit module receives the radio frequency signal from the coupled port of the directional coupler of the front-end radio frequency circuit module, it performs gain compensation through an amplifier and an attenuator and then outputs it to the large-dynamic detector of the detection signal operation circuit module. By adjusting the value of the attenuator, the large-dynamic detector is in a linear working state, so that the detection sensitivity is high. After passing through the large-dynamic detector, an output voltage is obtained. This voltage is related to the input power. Then, it undergoes voltage range amplification through an operational amplifier. For example, if the gain slope of the detector is set to 70 mV / dB, it is amplified through the operational amplifier, and then compared with the reference reference level 1 through the first comparator to obtain a control signal 1, and compared with the reference level 2 through the second comparator to obtain a control signal 2. The two groups of control signals are combined to form a certain control signal to control the switching of the single-pole triple-throw switch in the front-end radio frequency circuit module. The reference voltage is set by detecting the output voltage corresponding to the power of the detector. For example, in this embodiment, the set reference levels correspond to the detection output voltages of -50 dBm and 0 dB, and then the voltage obtained through the voltage regulator is divided by a multi-stage resistor network to reach the corresponding value.

[0027] 3. RF signal amplification circuit module

[0028] The RF signal amplification circuit module includes a low-power signal processing circuit, a medium-power signal processing circuit, and a high-power signal processing circuit, which respectively perform signal amplification and digital control processing through the cascading of several stages of amplifiers and digital control attenuators. Among them, as Figure 4 shown, a specific implementation of the low-power signal processing circuit is composed of a first amplifier 1, a second amplifier 2, a first digital control attenuator 3, a second digital control attenuator 4, a third amplifier 5, a fourth amplifier 6, and a third digital control attenuator 7. In this way, it can receive and process signals with a power range of -100 to -50 dBm, and realize the function of linearly amplifying low-power signals.

[0029] As Figure 5 shown, a specific implementation of the medium-power signal processing circuit is composed of a first amplifier 8, a first digital control attenuator 9, a second amplifier 10, a third amplifier 11, a fourth amplifier 12, and a second digital control attenuator 13. In this way, it can receive and process signals with a power range of -50 to 0 dBm, and realize the function of saturated output of medium-power signals.

[0030] As Figure 6 shown, a specific implementation of the high-power signal processing circuit is composed of a first amplifier 14 and a first digital control attenuator 15. In this way, it can receive and process signals with a power range of 0 to +20 dBm, and realize the function of power compression of high-power signals.

[0031] 4. Output power adjustment circuit module

[0032] As Figure 7 shown, the output power adjustment circuit module receives three signals output by the RF signal amplification circuit module (the output signals of the low-, medium-, and high-power signal processing circuits), selects one signal from the three signals through a single-pole triple-throw switch, then performs power flatness correction according to the expected index through a power equalizer, and then performs amplitude correction through an attenuator to obtain RF signals with different powers set according to requirements and output them.

Claims

1. A power adaptive link allocation front-end receiving component, characterized in that: It includes a front-end RF circuit module, a detected signal operation circuit module, a 3-channel RF signal amplification circuit module, and an output power adjustment circuit module; Among them, the front-end RF circuit module receives the input RF signal, which successively passes through a filter, a limiter, and a directional coupler, and divides the signal into two paths. One path of the RF signal passing through the through-end of the coupler is output to the 3-channel RF signal amplification circuit module after passing through a digital controlled attenuator, a low-noise amplifier, and a single-pole triple-throw switch. The other path of the RF signal passing through the coupled port of the coupler is output to the detected signal operation circuit module after passing through an amplifier and an attenuator; The detected signal operation circuit module amplifies and adjusts the power of the RF signal passing through the coupled port of the directional coupler in the front-end RF circuit module, and then passes through a large-dynamic detector, an operational amplifier, and then through a first comparator and a second comparator respectively. Different control signals are obtained by comparing with two different reference voltages to control the switching of the single-pole triple-throw switch in the front-end RF circuit module; The 3-channel RF signal amplification circuit module includes a low-power signal processing circuit, a medium-power signal processing circuit, and a high-power signal processing circuit, which respectively perform signal amplification and digital control processing through the cascading of several stages of amplifiers and digital controlled attenuators. Among them, the low-power signal processing circuit receives and processes RF signals with a power range of -100 to -50 dBm, the medium-power signal processing circuit receives and processes RF signals with a power range of -50 to 0 dBm, and the high-power signal processing circuit receives and processes RF signals with a power range of 0 to +20 dBm; The output power adjustment circuit module receives the three paths of signals output by the RF signal amplification circuit module, first selects one path from the three paths of signals through a single-pole triple-throw switch for output, and then passes through a power equalizer and an attenuator, and finally realizes the function of linearly amplifying the low-power signal and saturating the output of the medium-power signal and the high-power signal.

2. The power adaptive link allocation front-end receiving component according to claim 1, characterized in that: [[ID= 3. The power adaptive link allocation front-end receiving component according to claim 1, wherein: ​ 4. The power adaptive link allocation front-end receiving component according to claim 1, wherein: ​

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