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:
Jan. 16, 2001
Filed:
Jul. 31, 1998
David H. Minasi, Plantation, FL (US);
Gustavo D. Leizerovich, Miami Lakes, FL (US);
Peter J. Yeh, Coral Springs, FL (US);
Motorola, Inc., Schaumburg, IL (US);
Abstract
The RF section of a communication device (,) includes a receiver (,), a transmitter (,), first injection frequency generation circuit (,), and an intermediate frequency (IF) generation circuit (,). The IF generation circuit has a shared output coupled to both the receiver and transmitter, as well as a control circuit (,) for feedback control purposes. The IF generation circuit is used to generate IF for both the receiver and transmitter, thus using fewer components that two separate IF generation circuits. It includes two differently tuned voltage controlled oscillators (,) which are selectively and exclusively powered by first and second power switches (,), respectively. The control circuit provides a single control voltage corresponding to a desired frequency pair to both VCOs at a common control input, then selects the appropriate VCO depending on whether the communication device is receiving or transmitting.