Abstract

This paper describes the design and the development of a frequency doubler GaAs MMIC for digital radio link applications. The operation frequency band is 2.8-4.25GHz for the input signal, converted into the 5.6-8.5GHz doubled band for the output signal. With +16dBm RF power level at the output port, the spurious suppression results better than 15dB for the 1st harmonic, 25dB for the 3rd and the 4th harmonic. The conversion loss is close to OdB with a ripple in band of ±1.5dB, and the saturated output power is better than +18dBm over the whole operation band. The overall chip dimension is 3.556x3.012mm2(140xl20mils2).