A four-channel independent amplitude-stabilized local vibration power distribution device and method

Abstract

The invention discloses a four-channel independent fixed amplitude type local oscillator power dividing device and a four-channel independent fixed amplitude type local oscillator power dividing method, which belong to the technical field of microwave testing. The four-channel independent fixed amplitude type local oscillator power dividing device comprises a local oscillator cascade extension unit, a first-stage power dividing amplification unit, a second-stage tail end fixed amplitude type power dividing / amplification unit A and a second-stage tail end fixed amplitude type power dividing / amplification unit B. Through adoption of the four-channel independent fixed amplitude type local oscillator power dividing method of the invention, power dividing / amplification / amplitude stabilization functions can be completed after an internal local oscillator source signal is generated, and four channels of local oscillator signals which are necessary can be finally provided for a receiver of a vector network analyzer, each output branch has an independent broadband amplitude stabilization function, thereby improving power stability of the local oscillator signal, an adjustable range of amplitude and power, and an isolating performance between local oscillator channels, as well as enabling the vector network analyzers to have a direct receiver cascade extension capability; in addition, the performance of a local oscillator circuit of the vector network analyzer is improved, technical innovation requirements of a high-stability and high-accuracy vector network analyzer can be furthestsatisfied in a universal way, thereby achieving universality.

Description

technical field [0001] The invention belongs to the technical field of microwave testing, and in particular relates to a four-channel independent amplitude-stabilized local vibration power dividing device and method. Background technique [0002] With the rapid development of information technology, the performance indicators of microwave components, device components, and equipment are getting higher and higher, and the requirements for testing methods are becoming more and more refined. The performance of the vector network analyzer as the core instrument of microwave testing is higher. Requirements, especially higher technical requirements are put forward for the test accuracy, stability, dynamic range and other indicators of the whole machine and the function expansion ability of the whole machine. [0003] The vector network analyzer is the core test instrument in the field of microwave and millimeter wave testing. The application objects range from semiconductor chips ...

AI Technical Summary

Problems solved by technology

Compared with the first method, this method adopts the mode of first stabilizing the amplitude and then dividing the power after amplification. Although the power stability of the local oscillator signal has been improved, the subsequent one-point four-way power division channel includes two levels of 1 / 2 power division. The components such as the four-channel corresponding semi-rigid cable, the insertion loss standing wave and other characteristics will be different, so the nature of the output local oscillator power at the end is still not completely controlled

The adjustability, stability and channel consistency of the local oscillator output power can only be changed depending on the hardware performance, and the size of each local oscillator cannot be finely and independently set according to the needs of the multi-channel receiver, and is affected by the internal ambient temperature of the whole machine. In addition, the theoretical loss value of the power dividing circuit is large (12dB), which consumes too much power

[0008] These shortcomings of the traditional local oscillator channel will affect the power stability and accuracy of the multi-channel receiver local oscillator signal; it is not suitable for the innovative needs of the new generation of high-precision and high-stability instruments

[0009] 3. The shortcomings of the traditional two modes in terms of channel isolation: the isolation between the power splitter channels depends on the isolation performance of the pure power splitter circuit, and the isolation is poor, which is likely to cause radio frequency crosstalk between receivers through the local oscillator channel

[0010] 4. The technical development trend of vector network analyzers requires the use of internal receivers to further achieve absolute power and spectrum measurement, thus putting forward higher stability requirements for local oscillator channel signals. Therefore, traditional local oscillator channel implementation methods cannot meet the requirements of technological development for vector networks. New requirements for analyzer receiver stability;

[0011] 5. In the current method or mode, the local oscillator channel is closed rather than open, which cannot meet the convenience of realizing the co-local oscillator cascading function between the receivers of different vector network analyzers

Therefore, the traditional method cannot meet the extended test application of the vector network analyzer receiver based on the phase coherent signal system

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