Analysis And Design Of K Band Multiplier-by-six And Filter Multi-function MMIC

With the development of microwave circuits,the technology of Monolithic Microwave Integrated Circuit(MMICs)has become increasingly mature.With its many advantages,the Monolithic Microwave Integrated Circuit(MMICs)have been widely used in the military and civilian electronics industries to reduce system size and cost.The local oscillator signal of the transceiver system is usually obtained by multiplying,amplifying,and filtering the low frequency oscillator.Therefore,the frequency multiplier is an important part of the transceiver system.The monolithic frequency multiplier combines the advantages of a monolithic circuit,which can reduce the system volume,increase the system stability,and reduce the system cost.Therefore,it has a very research value in the communication system.MMIC frequency multipliers are popular in modern millimeter wave high frequency communication systems.This paper proposes a new method of six active frequency multiplication designs,using a first-order balanced active frequency multiplication method to design.For traditional high-frequency multipliers,the use of cascaded frequency-hopping chain structures has low harmonic rejection,and the use of first-order balanced active frequency multipliers can make the output filter better and achieve higher harmonics.Wave suppression.At the same time,the circuit structure of the cascade mode usually designs the chip as a rectangle,and the balanced structure can make the chip circuit and the structure have more possibilities.Moreover,due to the lower operating frequency band,the design of this design ensures that the circuit is as compact as possible while ensuring the suppression of harmonics.Based on the theory of microstrip resonators,a relatively compact interdigital microstrip filter is designed.According to pHEMT active frequency multiplication theory,balanced frequency multiplication theory and microstrip filter theory,using CAD software,this design achieves a six-fold filter Monolithic Microwave Integrated Circuit.The Monolithic Microwave Integrated Circuit consists of a double helix balun,a set of balanced active frequency multipliers,and a bandpass interdigital filter in three parts.This design uses a GaAs 0.15 pHEMT micron process semiconductor.Realized 12 dBm power 3.5~4GHz signal input to get 6th harmonic output greater than-4d Bm and ensure harmonic rejection above 35 dBc,output return loss less than-10 dB,chip area is 1.6mm*2.45 mm.