Push-push type voltage-controlled oscillator based on SIW differential filter

Abstract

The invention discloses a push-push type voltage-controlled oscillator based on an SIW differential filter. The push-push type voltage-controlled oscillator comprises an SIW differential filter, a first variable capacitance diode group, a second variable capacitance diode group, a first sub-oscillator, a second sub-oscillator and an SIW power combiner. The first variable capacitance diode group and the second variable capacitance diode group are coupled in the SIW differential filter; a first port and a second port of the SIW differential filter are respectively connected with two ends of thefirst sub-oscillator, and a third port and a fourth port of the SIW differential filter are respectively connected with two ends of the second sub-oscillator; the first sub-oscillator and the second sub-oscillator are connected with the SIW power combiner. And the output port of the SIW power combiner is used as the output port of the push-push type voltage-controlled oscillator. The push-push type voltage-controlled oscillator has the advantages of being low in power consumption, high in fundamental wave suppression degree, low in phase noise and high in quality factor.

Description

technical field [0001] The invention belongs to the technical field of oscillators, in particular to a push-push type voltage-controlled oscillator based on an SIW differential filter. Background technique [0002] Microwave frequency sources have always been an essential part of communication systems, providing stable frequency inputs for radar and wireless systems, and oscillators are the core of microwave frequency sources. With the rapid development of communication technology, the requirements for oscillators are getting higher and higher, and more forms of oscillators are designed to meet various conditions of use, and push-push oscillators are one of them. The push-push oscillator can effectively expand the operating frequency of the oscillator. Based on the principle of fundamental wave and odd harmonic cancellation and even harmonic superposition, the output frequency is multiplied. Therefore, the push-push oscillator is designed in two frequency, where the Q value...

AI Technical Summary

Problems solved by technology

[0003] Traditional push-push oscillators often use inverters to reverse the phases of the two sub-oscillators, but this greatly reduces the symmetry of the two sub-oscillator loops, which in turn deteriorates the suppression of odd harmonics and the second order The degree of harmonic synthesis makes it difficult to adjust the frequency of the two fundamental wave signals synchronously to realize the function of the voltage-controlled oscillator

Images