Wireless Access

Abhijit A Shah

Sergio A Sanielevici

A method and apparatus for wide range automatic frequency control. A control signal indicating a frequency within one of a plurality of frequency bands is received by an oscillator. In response, the oscillator generates a tuning signal having the indicated frequency. Based on the tuning signal, receive logic receives an input signal to obtain a sequence of values. Compare logic compares the sequence of values to a predetermined pattern. If the sequence of values does not match the predetermined pattern, frequency control logic outputs a different control signal to the oscillator to adjust the frequency of the tuning signal to another one of the plurality of frequency bands. Another input signal is received to obtain a new set of values and the new set of values is compared the predetermined pattern. The frequency control logic outputs a sequence of control signals to the oscillator in this manner until the compare logic indicates that a sequence of values matches the predetermined pattern or until the oscillator has been tuned to each of the plurality of frequency bands.

Method and apparatus for wide range automatic frequency control

A demodulation circuit providing for detection of multiple zero-crossings in an FSK signal. High data rate signals are demodulated by generating, for each pair of baseband signals I and Q, additional I and Q pairs which are phase shifted from the original I and Q pair. By generating zero crossing signals for the original baseband signals and for the phase shifted signals, additional zero crossings may be detected allowing demodulation of relatively high data rate modulated signals.

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Sunnyvale, CA, United States of America

Abhijit A Shah