Radio architecture with dual frequency source selection

US5465409A · kind A · utility

Assignee

• Motorola, Inc. · US

Inventors

• Jaime Andres Borras · Miramar, US
• Mark Chambers · Sunrise, US
• Jesus S. Pena Finol · Coral Springs, US
• Armando J. Gonzalez · Miami, US
• Cesar Carralero · Miramar, US
• Sayed Hossain Beladi · San Diego, US
• Levent Y. Erbora · Miami, US

Key dates

• Filing date: Mar 7, 1994
• Grant date: Nov 7, 1995
• Expiry date: Mar 7, 2014

Classification

• Technology area (CPC H): Electricity
• CPC primary: H04B1/406
• WIPO field: Telecommunications
• WIPO sector: Electrical engineering

Abstract

A radio having two architectural platforms integrated in one integrated circuit (IC). A synthesizer controller (312) selects between an offset local oscillator (LO) synthesizer (318) and a second LO synthesizer (316) to provide a common architecture for either an Frequency Division Duplex (FDD) or Time Division Duplex (TDD) system design while providing isolation between the two frequency sources. An offset LO signal (319) is translated to an isolated LO signal 310 and combined with a main LO signal (322) to provide the FDD platform. A second LO signal (314) is translated into the isolated LO signal 310 and combined with the main LO signal (322) to provide the TDD platform. The second LO synthesizer signal (314) is common to both systems in the receive mode.