Northrop Grumman Systems Corporation

Brian J Rosenkoetter

Mark Kintis

Jeffrey Mark Hinrichs

Donald R Martin

William Marvin Skones

Kenneth Weber

Robert R Harnden

Kai E Johnson

An apparatus for converting a digital input signal to an analog signal for transmission. The input signal can include more than one carrier signal. A plurality of delta-sigma modulation loop circuits are connected in an increasing order of operating frequency so as to reduce a word length of the input signal. A tuning circuit adjusts the signal frequency to a transmitting frequency for conversion to analog by a digital-to-analog converter. A first loop circuit is implemented using CMOS gates, and a second loop circuit and the tuning circuit are implemented using indium phosphide gates. The apparatus allows a high-resolution, wide-band RF multiple-carrier signal to be re-quantized to a lower-resolution signal while an acceptable signal-to-noise ratio is maintained.

Apparatus and methods for digital-to-analog conversion

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Herndon, VA, United States of America

Brian J Rosenkoetter