Digital intermediate frequency transmitter for wireless communication

The present invention is a wireless communication digital medium as a frequency transmitter, with the I signal and the Q signal of the base band of the base band first intermediate frequency signal of intermediate frequency up-conversion to an up-conversion to the base portion to the intermediate frequency up-converts the I-signal and a first computing unit for calculating the Q signal, and a DA converter for analog converting an output of the arithmetic unit, separating the output of the DA converter portion into two signals, and a second intermediate frequency for each of the two separate signal wireless including the intermediate-frequency modulator for modulating a signal based on the intermediate frequency modulated the two the separated signal and a second computing unit for computing, RF up-conversion unit for the output signal of the second operation unit RF up-converting It relates to a digital communication medium frequency transmitter. According to the invention, EVM, and it can bring improvement of the modulation quality, such as linearity, power consumption reduction, and by implementing the main characteristics of the wireless communication transmitter at a low cost through the integration compared with the method a high frequency 90-degree phase shifter, and more than twice the frequency a it can eliminate the need and the need for high frequency I / Q local oscillation signal of the voltage controlled oscillator with and can be implemented more effectively remove the sidebands (side-band rejection). SDR, a digital intermediate-frequency transmitter, a modulation quality, integrated, side band removal