A K-Band MMIC Subharmonically Pumped Mixer Integrating Local Oscillator Amplifier with Low Spurious Output

摘要

A K-band MMIC subharmonically pumped mixer integrating local oscillator (LO) amplifier has been devel - oped. For up-converter application, it is necessary to reduce the leakage of second harmonic component of LO frequency to RF port, which is generated by nonlinear operation of LO amplifier. A quasi-lumped short - circuited stub using microstrip structure Has been successfully applied to the MMIC mixer to enhance 2Flo-suppression We propose a new configuration of a quasi - lumped short - circuited stub, which reduces the influence of par - asitic elements of via - holes. The developed MMIC has a one - stage LO amplifier and it has shown about 10 dB-improvement of 2fLO-suppression compared to conventional configuration us - ing a quarter - wavelength short - circuited stub.