Method and apparatus for reducing re-radiation using techniques of universal frequency translation technology

• US 20040002321A1
• Filed: 12/13/2002
• Published: 01/01/2004
• Est. Priority Date: 04/16/1999
• Status: Active Grant

• Current Assignee: ParkerVision, Inc.
• Original Assignee: ParkerVision, Inc.
• Inventors: Cook, Robert W., Rawlins, Gregory S., Bultman, Michael J., Sorrells, David F., Moses, Charley D. Jr., Looke, Richard C., Rawlins, Michael W., Johnson, Martin R., Jensen, Jonathan S.
• Granted Patent: US 7,224,749 B2
• Time in Patent Office: Days
• US Class Current: 455/323
• CPC Class Codes: H03C 3/40 using two signal paths the outputs of which have a predetermined phase difference and at least one output being amplitude-modulated
• CPC Class Codes: H03D 3/006 by sampling the oscillations and further processing the samples, e.g. by computing techniques H03D3/007 takes precedence
• CPC Class Codes: H03D 7/00 Transference of modulation from one carrier to another, e.g. frequency-changing H03D9/00, H03D11/00 take precedence; dielectric amplifiers, magnetic amplifiers, parametric amplifiers used as a frequency-changers H03F
• CPC Class Codes: H04B 1/12 Neutralising, balancing, or compensation arrangements
• CPC Class Codes: H04B 1/123 using adaptive balancing or compensation means adaptive filter circuits and algorithms H03H
• CPC Class Codes: H04B 1/28 the receiver comprising at least one semiconductor device having three or more electrodes
• CPC Class Codes: H04B 1/30 for homodyne or synchrodyne receivers demodulator circuits H03D1/22

Abstract

Methods, systems, and apparatuses for down-converting an electromagnetic (EM) signal by aliasing the EM signal, and applications thereof are described herein. Reducing or eliminating DC offset voltages and re-radiation generated when down-converting an electromagnetic (EM) signal is also described herein. Down-converting a signal and improving receiver dynamic range is also described herein.

Claims

1. An apparatus for down-converting an electromagnetic signal and reducing DC offset voltages and re-radiation, comprising:

a first UFD module that receives an input signal, wherein said first UFD module down-converts said input signal according to a first control signal and outputs a first down-converted signal;

a second UFD module that receives said input signal, wherein said second UFD module down-converts said input signal according to a second control signal and outputs a second down-converted signal; and

a first subtractor module that subtracts said second down-converted signal from said first down-converted signal and outputs a first channel down-converted signal.