Computer simulation of multifrequency LSA oscillations in GaAs

The use of transmission lines in an equivalent circuit as suggested by Copeland [1] (instead of the usual lumped circuit elements) has resulted in computer simulation of the multiple-frequency operation associated with LSA oscillation in GaAs [2]. This technique is useful in determining design parameters for eliminating the low-frequency subharmonic and/or maximizing efficiency. For mobilities of 6000 cm²/Vċs, efficiencies are generally less than 1 percent if a lower frequency is present, and as high as 8.4 percent when it is absent.