Pulse or digital communications – Spread spectrum – Frequency hopping
Reexamination Certificate
2007-11-06
2007-11-06
Phu, Phuong (Department: 2611)
Pulse or digital communications
Spread spectrum
Frequency hopping
C375S135000, C375S375000, C375S376000
Reexamination Certificate
active
11382570
ABSTRACT:
A novel and useful fast hopping frequency synthesizer and transmitter associated therewith. The frequency synthesizer and transmitter incorporates a digitally controlled oscillator (DCO) adapted to operate open loop. Instantaneous frequency switching is achieved by changing an oscillator tuning word (OTW) to imitate the three oscillators of a UWB transmitter. In one embodiment, the DCO can change the frequency instantaneously within the 1/ƒTof the varactor devices used to construct the DCO. An all digital phase lock loop (ADPLL) is used for offline calibration prior to the start of packet transmission or reception. Any phase shift during the switching is tracked by a digital circuit in the transmitter. In a second embodiment, additional frequency accuracy is provided by use of a numerically controlled oscillator (NCO) that functions to generate a fine resolution complex exponential waveform which effectively shifts the synthesized frequency. A mixer applies the waveform to the I and Q data samples prior to conversion to the digital domain.
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Friedman Ofer
Staszewski Robert B.
Tal Nir
Brady W. James
Phu Phuong
Shaw Seven A.
Telecky , Jr. Frederick J.
Texas Instruments Incorporated
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