The Development of Quadrature Modulators and Demodulators 1800 MHz – 6 GHz with Digital Correction of Parameters

The broadband quadrature modulators/demodulators are used in communication systems, satellites, cellular, locators, wi-fi systems and other commercial circuits. In the article, the development of high-speed quadrature modulator and demodulator with embedded digital correction circuit by BiCMOS 180 nm technology is presented. The control block uses sequential data loading interface with 3 control inputs. Mixer core, polyphase filter, and digital correction circuits are considered in the paper. The article presents topologies of quadrature modulator, demodulator with frequency range 1800 MHz to 6 GHz, modulation bandwidth 700 MHz and 8 dBm input P1dB. Power consumption is less than 1000 mW.