Radio frequency signal source with amplitude modulation and automatic level control functions

Abstract

The invention discloses a radio frequency signal source with the amplitude modulation and automatic level control functions. The radio frequency signal source is characterized in that a modulation signal generating unit generates amplitude modulation signals, a variable attenuation unit is driven by drive signals to generate attenuation signals for input signal attenuation, a power distribution unit divides the attenuation signals into two paths, one path of the attenuation signals are directly output, the other path of the attenuation signals are output to a detector, the detector detects the input signals, detected signals are acquired, data processing units generate the drive signals according to the amplitude modulation signals and the detected signals, the variable attenuation unit comprises a first variable attenuator and a second variable attenuator which are connected in series, the first data processing unit generates the first drive signals for driving the first variable attenuator according to the detected signals, and the second data processing unit generates the second drive signals of the second variable attenuator according to the amplitude modulation signals. Amplitude modulation and automatic level control are separately set, the requirements of amplitude modulation and automatic level control do not need to be taken into consideration by all elements, and a circuit is easy to achieve.

Description

technical field [0001] The invention relates to the technical field of measurement and testing, in particular to a radio frequency signal source with amplitude modulation and automatic level control functions. Background technique [0002] In the field of measurement and testing, the RF signal source is a necessary measurement and testing instrument for RF and microwave workers. The radio frequency signal source is a radio frequency signal transmitting device, which can output continuous wave radio frequency signals with various parameters such as frequency and amplitude. Of course, it can also output various modulation signals, such as FM, AM, PM, IQ, Pulse and other modulation signals. The amplitude accuracy and stability of the output signal of the RF signal source is one of the important indicators of the RF signal source, and these indicators are generally realized by the ALC circuit (Automatic Level Control automatic level control circuit). [0003] The Chinese patent...

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Problems solved by technology

[0030] In order to solve the problem in the background technology that the design of the entire circuit is difficult because the AM modulation and ALC circuits are designed together, the present invention provides a radio frequency signal source with amplitude modulation and automatic level control functions

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