A Miniature Sampling Phase-locked Frequency Source Based On MMIC Technology

Along with the rapid development of science technology and industry for national defense, the request for local frequency source is higher than before in military microwave system, the demand of low phase noise, small volume, low power and high reliability is more and more obvious. To reach the requirement of system, high performance frequency source generally choose PDRO(Sampling Phase-Locked Dielectric Resonator Oscillator).Due to the domestic products can’t meet the using standard, current PDRO products mainly rely on imports, it is necessary to find a new method for designing smaller and higher reliable PDRO to fill the gaps in market and meet the requirement of domestic military electronic products.This paper designs a special DRO oscillation chip using MMIC technology, and completes the low phase noise, miniature target through the co-simulation of chip and DR resonator circuit with ADS software. The part of phase locking circuit is realized by the thin film hybrid integrated technology, ceramic substrate and bare chip element circuit are interconnected by bonding wire. Finally the miniaturized PDRO is fabricated and tested with the principle of phase-locked loop. This paper includes following parts:The first chapter introduces the development and technology of the current classification of frequency sources, and briefly outlines the advantages and disadvantages of each technology. Combining with the development situation of thick/thin film hybrid integrated technology and monolithic integrated circuit technology, the method of designing miniaturized sampling phase-locked frequency source PDRO for the space application is put forward.The second chapter introduces the basic principle of sampling phase-locked loop combining with the characteristics of step recovery diode. The circuit principle of each part in sampling phase locked frequency source is analyzed in detail, and the loop stability and phase noise are discussed. Finally it gives the best loop width project.The third chapter introduces the principle of dielectric resonator and negative resistance oscillation, and then put forward a design method of negative resistance oscillation of single MMIC. Depending on this chip, a series of miniature dielectric resonator oscillators are designed and tested, the test result show low phasenoise、wide tuning width. So the tuning screw can be cancelled and a hermetic package was realized.In the fourth chapter, using a 10 GHz sampling PLL frequency source as an example, introduces the implementation process of miniature sampling phase locked frequency source based on MMIC technology. Using a 100 MHz ultra low phase noise oven controlled crystal oscillator as a reference, the test result of the PDRO shows that the output frequency is 10 GHz, the phase noise is-114dBc/Hz at 1kHz offset, and the product size is 40mm×40mm×12.8mm, as the minimum volume PDRO now available to.