Modulators inventions 06/08

20080136546 - Digital modulation circuit and method as well as digital demodulation circuit and method: A mixer circuit accumulates I signal (digital signal of first channel) having its band limited by low-pass filter and first carrier signal to perform two-phase shift keying modulation thereon. An adder adds fundamental-wave component of bit clock signal BCK into Q signal (digital signal of second channel) having its band... Agent: Oblon, Spivak, Mcclelland Maier & Neustadt, P.c.

20080129405 - Apparatus and method for producing an sbpsk-type modulated signal using piecewise linear phase transition shaping: An apparatus and method for generating piecewise linear phase transitions during a phase transition interval of a first signal to control controlling the phase/frequency of a second signal. The initiation point, duration and shaping parameters of the piecewise linear phase transitions are selected to control adjacent channel emissions in the... Agent: Beusse Wolter Sanks Mora & Maire, P. A.

20080129406 - Direct wideband modulation of a frequency synthesizer: A frequency synthesizer modulates a signal by directly modulating a signal input to a voltage controlled oscillator (VCO) associated with the frequency synthesizer. The modulation signal has a bandwidth greater than a closed-loop bandwidth of the frequency synthesizer. The frequency synthesizer suppresses the modulation signal from a feedback path of... Agent: Coats & Bennett/infineon Technologies