A NOVEL DSM BASED ALL-DIGITAL IQ MODULATOR FOR A HIGHLY EFFICIENT MRI TRANSMITTER

All digital transmitters are gaining interest in magnetic resonance imaging applications. It provides high power efficiency during the course of imaging operation. We propose a novel, delta sigma modulation based all digital RF modulator. The proposed digital modulation architecture takes advantage of a digital single side band (SSB) modulator to save power; and a CORDIC algorithm to generate multi-band MRI signal with very high frequency resolution. The modulated digital signal can then be amplified with a switch-mode power amplifier to get high efficiency.

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