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:
Mar. 16, 2004
Filed:
May. 04, 1999
Eric M. Mrozek, Gardena, CA (US);
Craig A. Hornbuckle, Torrance, CA (US);
Northrop Grumman Corporation, Redondo Beach, CA (US);
Abstract
A multidetector ( ) circuit for use in a plurality of carrier recovery systems ( ) for recovery for a suppressed carrier modulated signal. The multidetector ( ) receives demodulated, in-phase x and quadrature phase y components of a baseband signal (s (t)) and generates output signals for use in a plurality of carrier recovery systems ( ). The multidetector ( ) generates a lock detection signal that varies primarily in accordance with a lock signal x y and a fourth-order amplitude detection signal (x +y ) for use in either system. The multidetector particularly generates a phase error signal xy(x −y ) for use in a Costas carrier recovery system ( ). The multidetector also generates a second-order amplitude detection signal (x +y ) for use in either system which can be used to adjust the amplitude of the incoming, modulated signal in order to control the loop gain of the carrier recovery phase locked loop.