Accurate design equations for 50-600 GHz GaAs Schottky diode varactor frequency doublers

To maintain the simplicity of equivalent circuit modeling while dramatically increasing accuracy, a set of analytical design equations are derived for nonlinear circuit analysis of 50-600 GHz Schottky diode varactor frequency doublers. These analytical design equations contain semi-empirical coefficients derived from a high performance Monte Carlo harmonic-balance (MCHB) numerical simulator. Both optimal diode embedding impedances and diode parameters for optimal doubler performance can be calculated. The calculated optimal embedding impedance is that which gives the best doubler efficiency for the given diode parameters, the circuit input power, and the input frequency. Thus, these equations allow for multiplier co-design from both a device and circuit point of view in a relatively simple, efficient and accurate manner.