High-sensitivity channelized receiver

Abstract

The utility model relates to the technical field of wireless communication, in particular to a high-sensitivity channelized receiver, which comprises a shell, a radio frequency pre-stage circuit, a frequency mixing circuit, an intermediate frequency filtering and amplifying circuit and an AGC (Automatic Gain Control) circuit, the radio frequency pre-stage circuit is arranged in the shell, the frequency mixing circuit is connected with the radio frequency pre-stage circuit, and the intermediate frequency filtering and amplifying circuit is connected with the AGC circuit. The intermediate frequency filtering and amplifying circuit is connected with the AGC circuit, and the radio frequency pre-stage circuit is responsible for primarily processing radio frequency signals received by an antenna, including filtering and primarily amplifying, so as to improve the availability of the signals; the frequency mixing circuit is responsible for converting a radio frequency signal into an intermediate frequency range so as to facilitate subsequent signal processing; the intermediate-frequency filtering and amplifying circuit is used for further filtering and amplifying the intermediate-frequency signal subjected to frequency conversion so as to improve the definition and the strength of the signal; the AGC circuit ensures that the intermediate frequency output power is stabilized in a specific range, detects the intensity of a radio frequency input signal, and adjusts the gain as required to maintain stable output.

Description

Technical Field

[0001] The utility model relates to the technical field of wireless communications, and in particular to a high-sensitivity channelized receiver. Background Art

[0002] In the field of wireless communication technology, the receiver plays an important role in communication equipment. It performs filtering, frequency conversion and amplification of weak signals, and its performance determines the quality of communication.

[0003] However, the existing receivers have the disadvantages of low dynamic range, poor anti-interference ability, and unreliable use. Utility Model Content

[0004] The purpose of the utility model is to provide a high-sensitivity channelized receiver, which solves the problems of existing receivers such as low dynamic range, poor anti-interference ability, and unreliable use.

[0005] To achieve the above-mentioned objectives, the present invention provides a high-sensitivity channelized receiver, comprising a housing, a radio frequency pre-stage circuit, a mixing circuit, an intermediate frequency filtering and amplifying circuit, and an AGC circuit. The radio frequency pre-stage circuit is arranged inside the housing, the mixing circuit is connected to the radio frequency pre-stage circuit, and the intermediate frequency filtering and amplifying circuit is connected to the AGC circuit.

[0006] In which, the RF front-stage circuit includes a limiter, a low-noise amplifier, a first single-pole four-switch, four filters and a second single-pole four-switch. The low-noise amplifier is connected to the limiter, and the first single-pole four-switch is connected to the low-noise amplifier. Two of the filters are connected to the first single-pole four-switch and the second single-pole four-switch respectively, and the other two filters are only connected to the second single-pole four-switch. The second single-pole four-switch is connected to the mixing circuit.

[0007] In which, the intermediate frequency filtering and amplifying circuit includes a surface acoustic wave filter, a first intermediate frequency amplifier, a crystal filter group, a first voltage-controlled attenuator, a second intermediate frequency amplifier, a second voltage-controlled attenuator and a third intermediate frequency amplifier, the surface acoustic wave filter is connected to the mixing circuit; the first intermediate frequency amplifier is connected to the surface acoustic wave filter; the crystal filter group is connected to the first intermediate frequency amplifier; the first voltage-controlled attenuator is connected to the crystal filter group and to the AGC circuit; the second intermediate frequency amplifier is connected to the first voltage-controlled attenuator; the second voltage-controlled attenuator is connected to the second intermediate frequency amplifier and to the AGC circuit; the third intermediate frequency amplifier is connected to the second voltage-controlled attenuator.

[0008] The utility model provides a high-sensitivity channelized receiver, wherein the RF front-stage circuit is responsible for preliminarily processing the RF signal received by the antenna, including filtering and preliminary amplification, to improve the availability of the signal; the mixing circuit is responsible for converting the RF signal to an intermediate frequency range to facilitate subsequent signal processing; the intermediate frequency filtering and amplifying circuit further filters and amplifies the intermediate frequency signal after frequency conversion to improve the clarity and strength of the signal; the AGC circuit ensures that the intermediate frequency output power is stable within a specific range, while detecting the strength of the RF input signal and adjusting the gain as needed to maintain a stable output; compared with the existing technology, the use of power splitter amplification synthesis technology improves the dynamic range of the module, the filter with a high rectangular coefficient improves the anti-interference ability of the module, and the analog AGC circuit design is simpler and more reliable than the traditional digital AGC circuit. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art.

[0010] Figure 1 It is a circuit principle diagram of the utility model.

[0011] Figure 2 It is a structural schematic diagram of the shell of the utility model.

[0012] In the figure: 101-housing, 102-RF pre-stage circuit, 103-mixing circuit, 104-IF filter amplifier circuit, 105-AGC circuit, 106-limiter, 107-LNA, 108-first single-pole four-switch, 109-filter, 110-second single-pole four-switch, 111-SAW filter, 112-first IF amplifier, 113-crystal filter bank, 114-first voltage-controlled attenuator, 115-second IF amplifier, 116-second voltage-controlled attenuator, 117-third IF amplifier. DETAILED DESCRIPTION

[0013] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, but should not be understood as limiting the present invention.

[0014] See also Figure 1 and Figure 2 ,in Figure 1 This is the circuit principle diagram of the utility model. Figure 2 It is a structural diagram of the shell.

[0015] The present invention provides a high-sensitivity channelized receiver, including a housing 101, a radio frequency front-stage circuit 102, a mixing circuit 103, an intermediate frequency filtering and amplifying circuit 104, and an AGC circuit 105. The radio frequency front-stage circuit 102 includes a limiter 106, a low-noise amplifier 107, a first single-pole four-switch 108, four filters 109, and a second single-pole four-switch 110. The intermediate frequency filtering and amplifying circuit 104 includes a surface acoustic wave filter 111, a first intermediate frequency amplifier 112, a crystal filter group 113, a first voltage-controlled attenuator 114, a second intermediate frequency amplifier 115, a second voltage-controlled attenuator 116, and a third intermediate frequency amplifier 117. The dynamic range of the module is improved by power division and amplification synthesis technology, and the filter with a high rectangular coefficient improves the anti-interference ability of the module. The analog AGC circuit design is simpler and more reliable than the traditional digital AGC circuit. It can be understood that the above-mentioned solution can be used to improve the anti-interference ability and reliability of the receiver.

[0016] The RF pre-stage circuit 102 is disposed inside the housing 101 , the mixing circuit 103 is connected to the RF pre-stage circuit 102 , and the intermediate frequency filter amplifier circuit 104 is connected to the AGC circuit 105 .

[0017] In this embodiment, the RF pre-stage circuit 102 is responsible for preliminary processing of the RF signal received by the antenna, including filtering and preliminary amplification, to improve the signal availability; the mixing circuit 103 is responsible for converting the RF signal to an intermediate frequency range to facilitate subsequent signal processing; the intermediate frequency filtering and amplifying circuit 104 further filters and amplifies the intermediate frequency signal after frequency conversion to improve the clarity and strength of the signal; the AGC circuit 105 ensures that the intermediate frequency output power is stable within a specific range, while detecting the strength of the RF input signal and adjusting the gain as needed to maintain a stable output.

[0018] Furthermore, the low-noise amplifier 107 is connected to the limiter 106, the first single-pole four-switch 108 is connected to the low-noise amplifier 107, two of the filters 109 are connected to the first single-pole four-switch 108 and the second single-pole four-switch 110 respectively, and the other two filters 109 are connected only to the second single-pole four-switch 110, and the second single-pole four-switch 110 is connected to the mixing circuit 103.

[0019] In this embodiment, since the receiver needs to process signals of multiple frequency bands simultaneously, and these signals may be within different frequency bands, in order to effectively separate and process these signals, the present invention divides the filters 109 into two groups, each group of filters is responsible for processing a specific frequency band. In this case, the first group of filters (i.e., the filters connected to both the first single-pole four-switch 108 and the second single-pole four-switch 110) is assigned to process signals of a lower frequency band. When a signal of this frequency band needs to be received and processed, the first single-pole four-switch 108 will route it to the corresponding filter 109 for filtering. At the same time, since the second single-pole four-switch 110 is also connected to these filters, it can provide additional routing options or backup when necessary. path; the second group of filters (i.e., the filters 109 connected only to the second single-pole four-switch 110) are assigned to process signals in a higher frequency band. When signals in this frequency band need to be received and processed, the second single-pole four-switch 110 will route them to the corresponding filters 109 for filtering. In actual applications, the connection method, number, and allocation method of the filters may vary depending on the receiver. In addition, the first single-pole four-switch 108 and the second single-pole four-switch 110 can flexibly switch signal paths according to the control signal of the receiver, routing the RF signal to the correct filter 109 for processing, ensuring that the receiver can simultaneously process signals in multiple frequency bands and can switch between different operating modes.

[0020] Furthermore, the surface acoustic wave filter 111 is connected to the mixing circuit 103; the first intermediate frequency amplifier 112 is connected to the surface acoustic wave filter 111; the crystal filter group 113 is connected to the first intermediate frequency amplifier 112; the first voltage-controlled attenuator 114 is connected to the crystal filter group 113 and to the AGC circuit 105; the second intermediate frequency amplifier 115 is connected to the first voltage-controlled attenuator 114; the second voltage-controlled attenuator 116 is connected to the second intermediate frequency amplifier 115 and to the AGC circuit 105; and the third intermediate frequency amplifier 117 is connected to the second voltage-controlled attenuator 116.

[0021] In this embodiment, the surface acoustic wave filter 111 is responsible for filtering out the redundant frequency components generated in the mixing process to ensure the purity of the intermediate frequency signal; the first intermediate frequency amplifier 112 is connected to the surface acoustic wave filter 111 to preliminarily amplify the filtered intermediate frequency signal to improve the signal strength for subsequent processing; the crystal filter group 113 is connected to the first intermediate frequency amplifier 112 to further filter out the stray components and adjacent channel interference in the intermediate frequency signal; the first voltage-controlled attenuator 114 is connected to the crystal filter group 113 and adjusts the attenuation according to the control signal of the AGC circuit 105 to achieve precise control of the intermediate frequency signal gain; the introduction of the first voltage-controlled attenuator 114 enables the receiver to operate under different input signals. The second IF amplifier 115 is connected to the first voltage-controlled attenuator 114 to further amplify the attenuated IF signal. The second voltage-controlled attenuator 116 is connected to the second IF amplifier 115 and further adjusts the attenuation according to the control signal of the AGC circuit 105 to achieve fine adjustment of the IF signal gain, so that the receiver can maintain stable output power within a wider input dynamic range. The third IF amplifier 117 is connected to the second voltage-controlled attenuator 116 to finally amplify the IF signal after two attenuation controls and two amplifications. The output of the third IF amplifier 117 will serve as the final output signal of the receiver for subsequent signal processing or demodulation. In addition, the AGC circuit 105 detects the strength of the RF input signal and adjusts the attenuation of the first voltage-controlled attenuator 114 and the second voltage-controlled attenuator 116 as needed to ensure that the IF output power is stable within a specific range.

[0022] Furthermore, the high-sensitivity channelized receiver has a receiving dynamic range of -107 to 5dBm and has a strong anti-blocking capability.

[0023] Furthermore, the high-sensitivity channelized receiver has two channel bandwidths: 25KHz and 8.33KHz.

[0024] Furthermore, the AGC design of the high-sensitivity channelized receiver ensures that the intermediate frequency output power variation range is ≤6dB within the entire input dynamic range.

[0025] Furthermore, the high-sensitivity channelized receiver is capable of accurately detecting the strength of radio frequency signals within the entire input dynamic range.

[0026] Furthermore, the high-sensitivity channelized receiver has a pre-stage filter 109 and a grouping filter 109 with high out-of-band suppression, which ensures that the module has a strong ability to resist interference from spurious signals.

[0027] Furthermore, the high-sensitivity channelized receiver has a crystal filter 109 with a high rectangular coefficient, which ensures that the module has a strong ability to resist adjacent channel signal interference.

[0028] The high-sensitivity channelized receiver of the present invention preliminarily processes the RF signal received by the antenna through the RF pre-stage circuit 102, including filtering and preliminary amplification, and realizes effective separation and processing of multi-band signals through two single-pole four-switch and four filters 109; then the mixing circuit 103 converts the RF signal to an intermediate frequency range to facilitate subsequent signal processing; the intermediate frequency filtering and amplifying circuit 104 further filters and amplifies the intermediate frequency signal after frequency conversion to improve the clarity and strength of the signal, and at the same time realizes precise control of gain and expansion of dynamic range through the combination of voltage-controlled attenuator and amplifier; the AGC circuit 105 ensures that the intermediate frequency output power is stable within a specific range, detects the strength of the RF input signal, and adjusts the gain as needed to maintain a stable output, thereby realizing signal reception and processing with high sensitivity, wide dynamic range, and strong anti-interference capability.

[0029] The above disclosure is merely one or more preferred embodiments of the present application and is not intended to limit the scope of the present application. A person skilled in the art will understand that all or part of the processes of the above embodiments and equivalent changes made in accordance with the claims of the present application are still within the scope of the present application.

Claims

1. A high-sensitivity channelized receiver, characterized in that: It includes a shell, a radio frequency pre-stage circuit, a mixing circuit, an intermediate frequency filtering and amplifying circuit, and an AGC circuit. The radio frequency pre-stage circuit is arranged inside the shell, the mixing circuit is connected to the radio frequency pre-stage circuit, and the intermediate frequency filtering and amplifying circuit is connected to the AGC circuit.

2. The high-sensitivity channelized receiver according to claim 1, wherein: The RF front-stage circuit includes a limiter, a low-noise amplifier, a first single-pole four-switch, four filters, and a second single-pole four-switch. The low-noise amplifier is connected to the limiter, and the first single-pole four-switch is connected to the low-noise amplifier. Two of the filters are connected to the first single-pole four-switch and the second single-pole four-switch, respectively, and the other two filters are connected only to the second single-pole four-switch. The second single-pole four-switch is connected to the mixing circuit.

3. The high-sensitivity channelized receiver according to claim 2, wherein: The intermediate frequency filtering and amplifying circuit includes a surface acoustic wave filter, a first intermediate frequency amplifier, a crystal filter group, a first voltage-controlled attenuator, a second intermediate frequency amplifier, a second voltage-controlled attenuator and a third intermediate frequency amplifier. The surface acoustic wave filter is connected to the mixing circuit; the first intermediate frequency amplifier is connected to the surface acoustic wave filter; the crystal filter group is connected to the first intermediate frequency amplifier; the first voltage-controlled attenuator is connected to the crystal filter group and to the AGC circuit; the second intermediate frequency amplifier is connected to the first voltage-controlled attenuator; the second voltage-controlled attenuator is connected to the second intermediate frequency amplifier and to the AGC circuit; and the third intermediate frequency amplifier is connected to the second voltage-controlled attenuator.

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