High-dynamic high-sensitivity logarithmic detection equipment

Abstract

The utility model relates to a high-dynamic high-sensitivity logarithmic detection device, which relates to the technical field of signal amplitude detection, and comprises a temperature compensation attenuator, a filter, an amplifier, an equalizer, a logarithmic detector and a differential operational amplifier which are connected in sequence. The broadband radio frequency signal is directly subjected to logarithmic detection and is output as the video voltage signal, so that the reduction of the tangent sensitivity of the logarithmic detector caused by the leakage of the local oscillator driving power in a frequency mixing mode is avoided, and the influence on the sensitivity of the whole equipment is avoided.

Description

Technical Field

[0001] This application relates to the field of signal amplitude detection technology, and particularly to a logarithmic detection device with high dynamic range and high sensitivity. Background Art

[0002] In existing signal amplitude detection technologies, the amplitude detection of radio frequency or intermediate frequency signals is mostly carried out within the same module. Generally, it is only used for fault detection, and can only judge the presence or absence of signals or roughly reflect the magnitude of radio frequency signals. Such an amplitude detection method has a low linear dynamic range, and is affected by the system environment and various stray levels, which affects the tangent sensitivity of the detector and cannot meet the requirements of some applications with demanding dynamic range and fast response. Utility Model Content

[0003] The logarithmic detection device with high dynamic range and high sensitivity provided by this application adopts the following technical solutions:

[0004] A logarithmic detection device with high dynamic range and high sensitivity, characterized in that it includes a temperature compensation attenuator, a filter, an amplifier, an equalizer, a logarithmic detector, and a differential operational amplifier connected in sequence.

[0005] In one embodiment, the input signal range of the radio frequency signal is 8 GHz to 18 GHz, and the input signal power range is -70 dBm to +5 dBm.

[0006] The logarithmic detection device with high dynamic range and high sensitivity provided by the embodiments of the present disclosure can achieve the following technical effects:

[0007] By directly performing logarithmic detection on the broadband radio frequency signal and outputting it as a video voltage signal, it is possible to avoid the reduction of the tangent sensitivity of the logarithmic detector caused by the leakage of the local oscillator drive power in the mixing method, and further avoid affecting the sensitivity of the entire device.

[0008] The above general description and the following description are only exemplary and explanatory, and are not used to limit this application. Description of the Drawings

[0009] Figure 1 It is a schematic structural diagram of the logarithmic detection device with high dynamic range and high sensitivity provided by the embodiments of this application. Detailed Description of the Embodiments

[0010] In order to make the purpose, technical solutions and advantages of the present utility model clearer, the following further describes the present utility model in detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present utility model and are not used to limit the present utility model.

[0011] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present utility model. In addition, in the description of the present utility model, the meaning of "plurality" is two or more, unless otherwise specifically defined.

[0012] The following further describes the present application in detail with reference to the attached Figure 1 drawings.

[0013] A high-dynamic high-sensitivity logarithmic detection device includes a temperature-compensated attenuator, a filter, an amplifier, an equalizer, a logarithmic detector, and a differential operational amplifier connected in sequence.

[0014] The broadband radio frequency signal passes through the temperature-compensated attenuator and the filter, and then the radio frequency signal is matched to the optimal radio frequency signal input power range of the logarithmic detector through the amplifier. Then, the amplitude within the working frequency band is optimized through the equalizer. After passing through the logarithmic detector, the radio frequency signal generates an analog voltage, and then the output voltage range is adjusted through the differential operational amplifier to make it meet the optimal level range for A / D sampling, while ensuring its corresponding logarithmic slope requirement and fast rise or fall time requirement.

[0015] By directly performing logarithmic detection on the broadband radio frequency signal and outputting it as a video voltage signal, it is possible to avoid reducing the tangent sensitivity of the logarithmic detector caused by the leakage of the local oscillator drive power in the mixing method, and further avoid affecting the sensitivity of the entire device.

[0016] In one embodiment, the input signal range of the radio frequency signal is 8 GHz to 18 GHz, and the input signal power range is -70 dBm to +5 dBm.

[0017] In one embodiment, the highest radio frequency input level of the amplifier is +20 dBm. Considering the losses of the temperature-compensated attenuator and the filter, the maximum input signal of this device should be 25 dBm, which can meet the requirement of the maximum withstand power of +20 dBm.

[0018] The filter and amplifier filter the received RF signals in the range of 8 GHz to 18 GHz and then amplify and output them. The logarithmic detector converts the RF signals with an amplitude from -70 dBm to +5 dBm into video voltage signals from 0.5 V to 2 V. The differential amplifier circuit adjusts the positive and negative slopes of the video voltage signals from 0.5 V to 2 V, amplifies and outputs them to 0 V to 5 V, and then feeds power to each functional module through high-temperature wires or circuit board traces.

[0019] In actual use, the device of the present application further includes a power processing circuit for filtering the input ±12 V DC voltage signal from the module and then converting and outputting +5 V, and at the same time converting +5 V into -5 V.

[0020] In one embodiment, the linear dynamic range of the device of the present application reaches 75 dB, and the slope reaches more than 60 mV / dB.

[0021] The above are all the preferred embodiments of the present application, and the protection scope of the present application is not limited thereby. Therefore, all equivalent changes made according to the structure, shape, and principle of the present application shall be covered within the protection scope of the present application.

Claims

1. A logarithmic detection device with high dynamic range and high sensitivity, characterized in that, It includes a temperature compensation attenuator, a filter, an amplifier, an equalizer, a logarithmic detector and a differential operational amplifier connected in sequence.

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