Agile alc system with amplitude and pulse modulation function and its control method
A pulse modulation and control method technology, applied in the field of microwave radio frequency, can solve the problems of affecting the power stability speed, large debugging workload, complex hardware circuit, etc., to ensure the accuracy of the carrier level, avoid hardware circuit design, and ensure the level The effect of accuracy
Active Publication Date: 2022-02-11
成都威频科技有限公司
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Problems solved by technology
However, this circuit can only work in a certain range of AM, and it will conflict with the control of ALC during deep AM. The response time of the ALC loop is very long, generally at the us level, which affects the power stabilization speed, and the AM bandwidth is limited by the ALC system. Hysteresis characteristics; at the same time, the hardware circuit is complex, the debugging workload is heavy, and it is not easy to realize
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[0028] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings, but the embodiments described in the present invention are some of the embodiments of the present invention, not all of them .
[0029] An aspect of the embodiment of the present application provides an agile ALC system with amplitude and pulse modulation functions, such as figure 2 shown, including the main link and the feedback loop.
[0030] Specifically, the main link includes an analog attenuation circuit, an amplification circuit, a switch, and a coupler connected in sequence; the feedback loop includes a detection circuit, a first voltage processing circuit, an ADC sampling circuit, an FPGA, a DAC conversion circuit, and a second voltage processing circuit. and switch drive circuits. The detection circuit is connected to the...
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The invention relates to the field of microwave radio frequency technology, and provides an agile ALC system with amplitude and pulse modulation functions and a control method thereof. The system includes a main link and a feedback loop, and the main link includes an analog attenuation circuit, an amplifying circuit, switch and coupler; the feedback loop includes a detection circuit, a first voltage processing circuit, an ADC sampling circuit, an FPGA, a DAC conversion circuit, a second voltage processing circuit and a switch driving circuit. The invention realizes accurate and fast power output with amplitude modulation and pulse modulation functions through simple hardware circuit design and digital control method. Through FPGA + high-speed AD / DA and look-up table, the power agility time is ns level, which solves the problem that the amplitude modulation rate is limited by the ALC stabilization time, and at the same time ensures the level accuracy when there is carrier output under pulse modulation, avoiding complex hardware circuit design.
Description
technical field [0001] The invention belongs to the field of microwave radio frequency technology, and in particular relates to an agile ALC system with amplitude and pulse modulation functions and a control method thereof. Background technique [0002] Automatic level control (ALC) technology is used to precisely control the output power and is widely used in signal sources and transmitters of mobile communication systems. Usually, an amplitude modulation circuit and a pulse modulation circuit are added to the ALC link to achieve power stability control of the signal source , amplitude modulation and pulse modulation functions. [0003] Such as figure 1 As shown, it is an AM ALC loop of a radio frequency microwave signal source in the prior art. The reference level and the AM signal are superimposed to form a feedforward signal that first acts on the linear attenuator, and the radio frequency signal is amplified and linearly modulated on the main link. , After re-amplific...
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IPC IPC(8): G05B19/042
CPCG05B19/0423G05B2219/24215
Inventor 肖伟刘畅金曙晨张晓东
Owner 成都威频科技有限公司