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This paper describes a classic method of an analog harmonic multiplier which uses a C class amplifier topology. The goal of this work is to propose the method of finding the optimal conduction angle of a E-pHEMT transistor so that a better spectral purity of the second or third harmonics can be obtained. MATLAB simulations are performed and the electronic circuit with an E-pHEMT transistor is designed. Measurements are made in both time and frequency domain and a comparsion of the results is presented.