Patent ID: 6163568
Filing Date: 2000-12-19
Classification: H04B

Abstract:
A low power transceiver system for a wireless communications interface having an antenna for receiving and radiating FSK modulated carrier signals, a switch system in electrical communication with said antenna for switching said antenna between a transmit mode and a receive mode, a microcontroller electrically controlling said switch system and having a parallel port for electrically communicating with a host system, which comprises:reference frequency means for generating a reference signal having a frequency equal to a sum of a frequency of said FSK modulated carrier signals and an offset frequency;preamp/filter means in electrical communication with said switch system for receiving and amplifying said FSK modulated carrier signals from said switch system, and for removing spurious signals from said FSK modulated carrier signals;mixer means in electrical communication with said preamp/filter means and said reference frequency means during both said receive mode and said transmit mode, and receiving said reference signal from said reference frequency means and said FSK modulated carrier signals from said preamp/filter means for providing a first FSK modulated offset signal having a frequency equal to said offset frequency;transmitter means in electrical communication with said microcontroller, said mixer means and said switch system during said transmit mode, and receiving a transmission data signal from said microcontroller for creating a second FSK modulated offset signal having a frequency equal to said offset frequency and for extending transceiver bandwidth through feedforward compensation, and receiving said first FSK modulated offset signal from said mixer means for comparing with said second FSK modulated offset signal to create a phase error signal and for generating a first of said FSK modulated carrier signals in response to said phase error signal, and receiving a sweep signal from said microcontroller for increasing speed at which said first of said FSK modulated carrier signals phase locks to said second FSK modulated offset signal and said first FSK modulated offset signal phase locks to said second FSK modulated offset signal; andreceiver means in electrical communication with said microcontroller and said mixer means during said receive mode for signalling an occurrence of a second of said FSK modulated carrier signals to said microcontroller and for demodulating said first FSK modulated offset signal to send transmission data to said microcontroller for transmission through said parallel port to said host system.