Demodulators – Frequency shift keying or minimum shift keying demodulator – Including logic element (e.g. – logic gate or flip-flop
Reexamination Certificate
2006-03-21
2006-03-21
Callahan, Timothy P. (Department: 2816)
Demodulators
Frequency shift keying or minimum shift keying demodulator
Including logic element (e.g., logic gate or flip-flop
C375S303000
Reexamination Certificate
active
07015749
ABSTRACT:
A frequency discriminator for detecting phase shifts between sequential pulses in a frequency-shift keyed (FSK) signal having a nominal frequency, f. The frequency discriminator comprises: 1) a first current controlled delay line for receiving the FSK signal and delaying the FSK signal by a desired time delay to thereby produce a time-delayed FSK signal; 2) a multiplier for receiving and multiplying the FSK signal and the time-delayed FSK signal to thereby produce an output product signal proportional to a phase shift between said FSK signal and said time-delayed FSK signal; and 3) a delay locked loop comprising a second current controlled delay line substantially similar to the first current controlled delay line. The delay locked loop receives a reference clock signal having a time period equal to the desired time delay and adjusts a control current level in the second current controlled delay line until a delay of the second current controlled delay line matches the time period of the reference clock signal. The control current level is then used to adjust a delay of the first current controlled delay line.
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Meacham Daniel R.
Yayla Ibrahim
Callahan Timothy P.
Cox Cassandra
National Semiconductor Corporation
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