Dual-channel?output microwave signal source amplitude stabilization control device

Abstract

The invention discloses a dual-channel?output microwave signal source amplitude stabilization control device. The device comprises an electrically?tunable attenuator module, a power division module, two power amplifier modules, two low pass filter modules, a demodulation module and an integral summation module. Single-channel generation signals adopt the power division module to generate dual-channel microwave signals, the electrically?tunable attenuator module is arranged in front of the power division module, a directional coupler is adopted to one channel for coupling and sampling for amplitude stabilization demodulation, and thus an amplitude stabilization control circuit is designed. In order to ensure the output power of the whole machine is stable, the amplitude stabilization sampling circuit is arranged close to the output end of the whole machine, the design is simplified, the cost is reduced, and as temperature compensation design is adopted, influences of environmental temperature changes on amplitude stabilization control can be reduced.

Description

technical field [0001] The invention relates to the field of signal control devices, in particular to a dual-channel output microwave signal source amplitude stabilization control device in a dual-channel microwave humidity density detector. Background technique [0002] There are many factors that affect the output amplitude of a microwave signal source. Changes in the environment, power supply, load, etc. will cause changes in the output amplitude. The instability of the microwave signal output amplitude will directly cause inaccurate and non-repeatable measurement results, so the general microwave signal source needs to design an automatic amplitude stabilization control device. The method of stabilizing amplitude generally adopts negative feedback automatic control loop. [0003] In the current control loop of the amplitude stabilization circuit, the microwave signal is input to the voltage-controlled attenuator, amplified by the radio frequency amplifier circuit, and p...

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Problems solved by technology

[0004] For the realization of dual-channel microwave signal sources, there are two methods: one is to use two sets of completely independent signal sources, which has the advantage that the two-channel signals are independent, and if one fails; the disadvantage is that the main control module needs to The two signals are controlled separately, which increases the burden on the CPU, and at the same time, the number of devices used also increases, which reduces the reliability

The second method is to generate a single-channel signal, and then amplify and stabilize the amplitude of the two-channel microwave signal through a power divider. The advantage is to reduce the burden on the CPU and increase reliability; Interference between the two-way signals, the shared circuit is out of order, and the two-way signals cannot be used

[0005] For the implementation of the above two dual-channel signal sources, the traditional amplitude stabilization design generally adopts a separate set of amplitude stabilization control circuits for each output channel, which results in complex design, large circuits, high cost, poor reliability, and generally no temperature. Compensation, greatly affected by ambient temperature changes

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