Analysis and Design for Milimeter-wave PHEMT VCO in the Time Domain

摘要

In this paper a Ka-band microstrip PHEMT VCO is analyzed and designed for output power and oscillating frequency in the time domain using a nonlinear transistor model. Microstrip is lumped into inductros and capacitors for analysis. Making use of the nonlinear transistor model and its parameters, the state equation of the lumped equivalent circuit of the VCO is founded. The state equation is solved by computer simulation with PSPICE of MicroSim. Utilizing the result of simulation, transient and steady process of the VCO under the given initial condition can be understood and a Ka-band PHEMT VCO is designed.