The quadrature phase error influence modeling of the LO on the intermediation products suppression in cartesian loop
The modern radio transmission systems using amplitude and amplitude-phase modulation, and form RF signal having a complicate spectrum. Linearize the power amplifier, while maintaining low consumption allows when cartesian loop are using. Many factors affect the linearization efficiency, in particular the LO quadrature phase error. The article considers the Matlab model of the cartesian loop, and simulates the influence of LO quadrature phase error on the third order intermodulation products level. It is established that the phase error does not lead to efficiency decreasing of their suppression. In this case, the cartesian loop reduces the level of the upper sideband by 10 dB.