Wireless computer network including a mobile appliance containing a single chip transceiver

US7061855B2 · kind B2 · utility

Assignee

• Cisco Systems Wireless Networking (Australia) Pty Limited · AU

Inventors

• Neil Weste · Parramatta, AU
• Andrew R. Adams · Sydney, AU
• Philip J. Ryan · Sydney, AU
• John D. O'Sullivan · Parramatta, AU
• David J. Skellern · Chatswood, AU
• Richard A. Keaney · Sydney, AU

Key dates

• Filing date: Jun 27, 2005
• Grant date: Jun 13, 2006
• Expiry date: Jun 27, 2025

Classification

• Technology area (CPC H): Electricity
• CPC primary: H04B1/405
• WIPO field: Telecommunications
• WIPO sector: Electrical engineering

Abstract

A wireless computer data network includes several untethered mobile units that make ad-hoc data connections with an Internet-connected base station using the IEEE-802.11a standard. Each unit includes a radio transceiver fully integrated on a single semiconductor chip. The receiver portion is a double-conversion superheterodyne type, and shares the same intermediate and local oscillator frequencies with a two-stage up-conversion transmitter. Two on-chip synthesizers that each include a voltage-controlled oscillator and phase-locked loop can be operated independently for each conversion stage, or operated in offset mode. External reference frequencies can be injected for voltage-controlled oscillator and phase-locked loop testing, chip characterization, and automatic compensation modeling. Each mobile and base unit can be outfitted with transmit/receive antenna transfer switches, RF-power amplifiers, and low-noise receiver amplifiers to increase operating range.