Nonlinear transmission line comb wave generation circuit for fundamental wave mixing

Abstract

The invention provides a nonlinear transmission line comb wave generation circuit for fundamental wave mixing. A uniform lossless transmission line is designed on a radio frequency printed board, variable capacitors are selected according to rising edge compression parameter requirements to be uniformly connected to the transmission line to simulate nonlinear transmission line characteristics, so that a comb wave generation function is realized. According to the circuit, the nonlinear transmission line technology is adopted in a comb wave generation module for fundamental wave mixing, the structure is simple, and design and debug are easy; engineering implementation can be realized on the printed board only, without other chips, so that the cost is low, and the practical value is high; and moreover, a well pulse shaping characteristic is provided, so that a low-noise and high-quality higher harmonic signal can be generated conveniently.

Description

technical field [0001] The invention relates to the field of signal sources, in particular to a nonlinear transmission line comb wave generating circuit for fundamental wave mixing. Background technique [0002] With the development of modern radar and radio communication technology, various electronic devices have continuously put forward higher requirements for the frequency synthesizers used in their internal applications or system tests. The most important point is to have excellent phase noise characteristics. At present, the phase noise can be effectively suppressed by using the fundamental wave mixing method in the phase-locked loop. The core module to realize the fundamental wave mixing is the comb wave generator with low phase noise characteristics. [0003] For example, the generation of high-order multiplier signals (N>5) is usually obtained by band-pass filtering the comb spectrum generated by the comb spectrum generator. At present, most comb spectrum generat...

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Problems solved by technology

[0004] The disadvantage of the above two methods is that the circuit debugging is complicated. The step tube in the first method is a highly nonlinear component, which is easy to cause self-excitation and oscillation of the circuit, so it needs to be carefully debugged in actual work

In the second method, transistors working in the avalanche region are prone to avalanche oscillation, and can only work at lower frequencies, so the application range is limited

[0007] At present, comb wave generators realized by nonlinear transmission line theory mostly use left-handed materials with negative permittivity and magnetic permeability. The purpose is to pursue the harmonic frequency of THz. Its structure is as follows: figure 1 As shown, the frequency response characteristic of the entire network presents a high-pass characteristic, and harmonics of 3-10 GHz are required in practical applications, so it does not meet the requirements of a low-noise fundamental wave mixing comb generator

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