Variable rate modulator

Details Variable rate modulator Variable rate modulator

2005-09-13

2005-09-13

Bayard, Emmanuel (Department: 2631)

Pulse or digital communications

Synchronizers

Phase displacement, slip or jitter correction

C375S306000

Reexamination Certificate

active

06944250

ABSTRACT:
Digital data signals at a variable input frequency are converted by a numerically controlled oscillator and an interpolator to a signal at a fixed output sampling frequency. The conversion of the variable input frequency to the fixed output sampling frequency may be by a factor other than an integer. The interpolated digital data signals at the fixed output sampling frequency are then modulated into a pair of trigonometric signals at a programmable carrier frequency, one signal having a cosine function and the other signal having a sine function. The modulated signals at the fixed output sampling frequency are then combined to create a modulated signal at a carrier frequency determined by the frequency of the sine and cosine signals. The modulated signal is sampled at the fixed output sampling frequency and converted to a corresponding analog signal using a digital-to-analog converter.

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Henry Samueli et al., “VLSI Architectures For A High-Speed Tunable Digital Modulator/Demodulator/BandPass-Filter Chip Set,” Integrated Circuits and Systems Laboratory Electrical Engineering Dept. University of California Los Angeles (ISCAS '92), 4 pages.

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