Fourth Harmonic Mixer Circuit Applied to Mercury Ion Microwave Frequency Standard

Abstract

The invention relates to the field of microwave frequency synthesis, in particular to a fourth harmonic mixer circuit applied to mercury ion microwave frequency standards, which includes a low-pass filter, a first band-pass filter, a diode pair matching circuit and a second band-pass filter. A pass filter, the output ends of the low pass filter and the first band pass filter are connected to the diode pair matching circuit, and the output end of the diode pair matching circuit is connected to the second band pass filter. This circuit utilizes the nonlinear effect of the microwave diode pair X1. When the low-pass filter and the first band-pass filter input the microwave signal into the matching circuit of the diode pair, various harmonics will be generated, and the matching circuit of the diode pair X1 is Other harmonic components are suppressed to make the output power of the useful signal component larger, and finally the useful signal component is filtered and output by the second band-pass filter to achieve the effect of synthesizing a 9.875GHz microwave signal and a 1GHz microwave signal into a 40.5GHz microwave signal Purpose.

Description

technical field [0001] The invention relates to the field of microwave frequency synthesis, in particular to a fourth harmonic mixer circuit applied to mercury ion microwave frequency standards. Background technique [0002] The mercury ion microwave frequency standard is one of the microwave frequency standards with the best performance index at present, its clock transition frequency is as high as 40.5GHz, and the line width is about tens of millihertz. Therefore, the frequency is as high as 40.5GHz, and the microwave frequency whose resolution must reach the order of millihertz is one of the key technologies of the mercury ion microwave frequency standard. In the existing frequency synthesis technology, frequency multiplication technology based on phase-locked loop is commonly used. Using this technology, microwave signals of several GHz or even tens of GHz can be easily synthesized, while frequency multiplication based on the combination of DDS and phase-locked loop The...

AI Technical Summary

Problems solved by technology

In the existing frequency synthesis technology, frequency multiplication technology based on phase-locked loop is commonly used. Using this technology, microwave signals of several GHz or even tens of GHz can be easily synthesized, while frequency multiplication based on the combination of DDS and phase-locked loop The technology can make the frequency resolution of the synthesized microwave signal reach the sub-millihertz level, but it is impossible to synthesize microwave signals with a frequency of up to 40.5 GHz and a resolution of the millihertz level that meet the mercury ion microwave frequency standard.

Existing commercial instruments, due to their wide frequency range, lead to the disadvantages of complex structure, large volume, high power consumption, etc., which cannot meet the requirements of mercury ion microwave frequency standard

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