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:
Aug. 29, 1995
Filed:
Jun. 11, 1993
Manbir Nag, Plantation, FL (US);
Joseph P Heck, Ft. Lauderdale, FL (US);
Motorola, Inc., Schaumburg, IL (US);
Abstract
A decoder circuit (21) and method for providing an amplitude compensated signal by removing the undesired effect of amplitude modulation on a phase modulated signal. The decoder method is provided by demodulating a received inphase receive signal component (10) and quadrature receive signal component (12) of the phase modulated signal and outputting an amplitude varying signal (15) to a feedforward automatic gain control circuit that outputs an amplitude compensated signal (38). The feedforward automatic gain control circuit comprises a detector circuit (16), an offset bias circuit (32), a differencer circuit (30) and a gain control circuit (28). The detector circuit (16) outputs a DC signal (17) representing an amplitude of the inphase receive signal (10) and the quadrature receive signal (12). The offset bias circuit (32) provides a constant current bias (29) to the DC signal (17) thus creating a control signal 31. The gain control circuit (28) receives the control signal (31) and the amplitude varying signal (15) and outputs an amplitude compensated signal (38).