Multiple band RF transmitters and receivers having independently variable RF and IF local oscillators and independent high-side and low-side RF local oscillators

US7266352B2 · kind B2 · utility

Assignee

• Wionics Research · US

Inventors

• Zaw Soe · Encinitas, US
• Tony Yang · Irvine, US
• Jackie Cheng · Irvine, US
• Sining Zhou · Irvine, US
• Kuangyu Li · Glendale, US
• Fei Yang · Plano, US
• ShouFang Chen · Baoshan, TW
• Tom Baker · Los Angeles, US

Key dates

• Filing date: May 28, 2004
• Grant date: Sep 4, 2007
• Expiry date: Oct 29, 2025

Classification

• Technology area (CPC H): Electricity
• CPC primary: H04B1/403
• WIPO field: Telecommunications
• WIPO sector: Electrical engineering

Abstract

Multistage RF transmitter and receiver circuits may use independently variable RF and IF local oscillators, allowing the RF and IF local oscillator frequencies for a given RF channel to be selected to have a large common factor with respect to the reference oscillator used by the local oscillator circuits, thus allowing the use of small divisor numbers in the local oscillator circuits and reducing phase noise. Independent high-side and low-side RF local oscillators may be provided and selectively used depending on the RF channel to be transmitted or received.