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Rear-mounted mixing digital ALC (Automatic Level Control) system device based on DDS

A control system and frequency mixing technology, which is applied in the direction of amplification control, gain control, multi-frequency modulation transformation, etc., can solve the problems of poor control amplitude accuracy and stability, and the inability to realize analog modulation, so as to improve amplitude stability accuracy and avoid temperature Effects of drift and stability issues

Active Publication Date: 2017-07-14
ANHUI EGRETS ELECTRONICS TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0013] The purpose of the present invention is to provide a post-mixing digital ALC control system device based on DDS, to solve the existing defects of the analog ALC control system and digital ALC control in the prior art, which lead to poor control amplitude accuracy and stability, and cannot Problems implementing analog modulation

Method used

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  • Rear-mounted mixing digital ALC (Automatic Level Control) system device based on DDS
  • Rear-mounted mixing digital ALC (Automatic Level Control) system device based on DDS
  • Rear-mounted mixing digital ALC (Automatic Level Control) system device based on DDS

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Embodiment Construction

[0033] like image 3 As shown, a DDS-based post-mixing digital ALC control system device includes a digital frequency synthesizer DDS, a radio frequency mixing channel, a directional coupler, a broadband detector, a data acquisition unit, and a data processing unit, wherein:

[0034]The digital frequency synthesizer DDS is a direct digital frequency synthesizer 9;

[0035] The RF mixing channel is composed of a mixer 1, a filter unit 2, and a power amplifier 3. The digital frequency synthesizer DDS generates an intermediate frequency signal and inputs it to the mixer 1. In the mixer 1, it mixes with a local oscillator to obtain a frequency matching The required carrier signal, the carrier signal is filtered by the filter unit 2, amplified by the power amplifier 3, and then output to the directional coupler;

[0036] The directional coupler is a power distribution unit 4, the main output end of the power distribution unit 4 is connected to the output main channel of the radio ...

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Abstract

The invention discloses a rear-mounted mixing digital ALC (Automatic Level Control) system device based on a DDS. The device comprises the direct digital synthesizer DDS, a mixer, a filter unit, a power amplifier, a power allocation unit, a logarithmic detector, a voltage amplifier, an A / D collection chip and a digital processing unit. A PIN variable resistance diode or a numerical control attenuator in a traditional ALC system is replaced by the direct digital synthesizer DDS. The direct digital synthesizer DDS is mounted before the mixer unit. A complex analog processing circuit in the traditional ALC system is replaced by the data processing unit on a feedback circuit. The device has the advantages of good temperature stability, high amplitude stabilization precision and high bandwidth response and is applicable to the field of many test devices.

Description

technical field [0001] The invention relates to the field of automatic level control systems, in particular to a post-mixing digital ALC control system device based on DDS. Background technique [0002] Automatic Level Control (ALC) system has a very wide application in the field of communication electronics such as communication, radar transmitter and various measuring instruments, and it has a very significant impact on the performance index of the system. The reason why the ALC control system is widely used in various signal sources is that it is difficult to maintain the accuracy and stability of the output signal level due to unstable or unsatisfactory electronic components of the signal source, and the system is subject to external interference. The ALC control system is the main way to ensure the above performance indicators. [0003] The closed-loop feedback analog ALC control system is a very common analog amplitude stabilization system on the transmitter. Compared...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03D7/16H03G3/30G06F1/02
CPCG06F1/022H03D7/16H03G3/3036
Inventor 万耿华
Owner ANHUI EGRETS ELECTRONICS TECH
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