GMSK modulator formed of PLL to which continuous phase modulated signal is applied
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United States of America Patent
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Oct 20, 1998
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N/A
app pub date -
Jun 17, 1997
filing date -
Jun 17, 1997
priority date (Note) -
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Abstract
A Gaussian Minimum Shift Keying modulator that provides direct modulation of a carrier signal, produced by a single microwave high power voltage controlled oscillator. A continuous phase frequency shift keyed modulated signal with a modulation index of 0.5 is produced at the desired output frequency using a full 360 degree linear continuous phase modulator, controlled by a linear baseband signal that is the integral of the binary baseband information signal. This modulated signal is used as the reference signal for a phase locked high power voltage controlled oscillator. The phase locked loop provides frequency tracking and Gaussian spectral shaping to the modulated output signal.
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