Patent ID: 7881409

Claim:
A high data rate wireless receiver for an FSK data transceiver system having a data transfer protocol, and a carrier signal having a pair of carrier frequencies, the receiver having a signal path and including a digital FSK demodulator for demodulating an FSK signal by measuring the period of incoming carrier signal cycles using a high frequency local clock time-base, f TB , the FSK demodulator demodulating the FSK signal having a data rate from the carrier signal, the digital FSK demodulator generating a serial data bit stream based on the FSK carrier signal and generating a synchronized constant frequency clock signal from the carrier frequencies based on the data transfer protocol for sampling the serial data bit stream wherein the frequency of the local clock time-base is substantially higher than the carrier frequencies to digitally measure periods of each received half cycle of the FSK carrier signal wherein the demodulator discriminates between carrier frequencies regardless of data rate and wherein the data transfer protocol, the FSK demodulator and the receiver are all fully digital without the need for analogue circuits in the signal path of the receiver to make the system small, low power and robust.