The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Apr. 18, 2006
Filed:
Mar. 29, 2002
Jeffrey M. Hinrichs, San Diego, CA (US);
Brian J. Rosenkoetter, Herndon, VA (US);
Robert R. Harnden, Redondo Beach, CA (US);
Kenneth B. Weber, Redondo Beach, CA (US);
Mark Kintis, Manhattan Beach, CA (US);
Donald R. Martin, Redondo Beach, CA (US);
William M. Skones, Manhattan Beach, CA (US);
Kai E. Johnson, Redondo Beach, CA (US);
Jeffrey M. Hinrichs, San Diego, CA (US);
Brian J. Rosenkoetter, Herndon, VA (US);
Robert R. Harnden, Redondo Beach, CA (US);
Kenneth B. Weber, Redondo Beach, CA (US);
Mark Kintis, Manhattan Beach, CA (US);
Donald R. Martin, Redondo Beach, CA (US);
William M. Skones, Manhattan Beach, CA (US);
Kai E. Johnson, Redondo Beach, CA (US);
Northrop Grumman Corporation, Los Angeles, CA (US);
Abstract
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.