Multi-mode VCO for direct FM systems

Details Multi-mode VCO for direct FM systems Multi-mode VCO for direct FM systems

2011-07-05

2011-07-05

Odom, Curtis B (Department: 2611)

Pulse or digital communications

Synchronizers

Phase displacement, slip or jitter correction

C331S167000

Reexamination Certificate

active

07974374

ABSTRACT:
Systems for multi-mode phase modulation are disclosed. Systems provide for direct modulation of a multi-mode voltage controlled oscillator (VCO). A fractional-N counter may be used in a phase-locked loop (PLL) to synthesize a radio frequency carrier signal. The multi-mode VCO may be characterized by a first frequency gain during operation in a first mode and by a second frequency gain during operation in a second mode where signals controlling the first and second operating modes are provided by a control circuit. The control circuit may include a switch to provide control signals to the VCO.

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