Modulators inventions 12/08

20080315967 - Variable pulse-width modulation with zero d.c. average in each period: Pulse-width modulation (PWM) finds wide use in many applications including motor control, communication systems, music synthesizers, power supplies, class-D and digital amplifiers, among others. The Fourier series expansion of each period of a pulse waveform includes an additive term that is a function of the pulse width in that period.... Agent: Fitch Even Tabin And Flannery

20080297269 - Frequency shift keying modulator having sigma-delta modulated phase rotator: A frequency shift keying modulator having sigma-delta modulated phase rotator is disclosed, which includes a phase-locked loop for generating a voltage-controlled signal; a multi-phase generator for receiving the voltage-controlled signal and generating N phase-shift signals having same frequency according to the voltage-controlled signal, the N phase-shift signals having a same... Agent: Law Offices Of Mikio Ishimaru

20080297270 - Driver circuit of optical modulator: A drive signal generation unit generates first and second drive signals for driving first and second phase modulators of a DQPSK optical modulator. First and second regeneration circuits regenerate the first and second drive signals with respect to clock signals. The first and second phase modulators are driven by the... Agent: Hanify & King Professional Corporation