Texas Instruments Corporation

ChienKuo Tien

James E C Brown

Bret Rothenberg

Inging Yang

A first-order signal generator (). The generator comprises a shift register (') having a number N of bit positions. Each bit position is operable to store a binary value, the shift register operable to shift the binary value at each of the bit positions. The generator also comprises circuitry for tapping selected ones of the bit positions and circuitry for applying a function (&#x2032;) to each binary value in the selected ones of the bit positions to provide a function output. The generator also comprises circuitry for coupling the function output as an input to one of the bit positions. Lastly, the generator also comprises circuitry (&#x2032;) for outputting a first-order noise signal by coupling, as a twos complement number, each binary value in a plurality of the bit positions.

Linear feedback shift register first-order noise generator

A method and apparatus for generating a burst FSK signal having precisely shaped transitions between modulation states. The apparatus uses feedforward compensation of phase gain and phase preemphasis coefficients for compensating the frequency conversion gain of the apparatus, and the phase gain coefficient is used for stabilizing a frequency synthesis loop. The phase gain and preemphasis coefficients are determined in a calibration within the time constraints of on-line signal bursts based upon measured phase errors and accelerated predicted phase gain and preemphasis phase errors.

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Cupertino, CA, United States of America

ChienKuo Tien