06061551 is referenced by 153 patents and cites 380 patents.

Methods, systems, and apparatuses for down-converting an electromagnetic (EM) signal by aliasing the EM signal are described herein. Briefly stated, such methods, systems, and apparatuses operate by receiving an EM signal and an aliasing signal having an aliasing rate. The EM signal is aliased according to the aliasing signal to down-convert the EM signal. The term aliasing, as used herein, refers to both down-converting an EM signal by under-sampling the EM signal at an aliasing rate, and down-converting an EM signal by transferring energy from the EM signal at the aliasing rate. In an embodiment, the EM signal is down-converted to an intermediate frequency (IF) signal. In another embodiment, the EM signal is down-converted to a demodulated baseband information signal. In another embodiment, the EM signal is a frequency modulated (FM) signal, which is down-converted to a non-FM signal, such as a phase modulated (PM) signal or an amplitude modulated (AM) signal.

Title
Method and system for down-converting electromagnetic signals
Application Number
9/176022
Publication Number
6061551
Application Date
October 21, 1998
Publication Date
May 9, 2000
Inventor
Charley D Moses Jr
Jacksonville
FL, US
Richard C Looke
Jacksonville
FL, US
Robert W Cook
Switzerland
FL, US
Michael J Bultman
Jacksonville
FL, US
David F Sorrells
Jacksonville
FL, US
Agent
Sterne Kessler Goldstein & Fox P L L C
Assignee
Parkervision
FL, US
IPC
H04H 1/00
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