Abstract:For the successful transmission of complex signals through frequency multipliers, high order analysis of IMD responses for a frequency tripler is performed and the optimum solutions for the harmonic injection technique is presented to suppress the high order IMDs in the 3 rd zone. From the 7 th order analysis, optimum injection was found to suppress IMDs in the 3 rd harmonic zone and their optimum phases are shown to be apart by 180 degrees due to the even-ordered Volterra products of the injection. The measurement results showed IMD suppression better than 30 dB, which is consistent with the analysis and the simulated results.