Modulators inventions 09/08

20080224788 - Method and apparatus for pulse width modulation in a switching amplifier: There is provided a method and apparatus for output pulse width modulation in a digital amplifier including: a determining step of adding or subtracting a value corresponding to a predetermined offset to or from an input audio signal alternately according to a period of the input audio signal, thereby determining... Agent: Cantor Colburn, LLP

20080224789 - Phase locked loop and method thereof: In a phase locked loop (PLL), phase shifters shift a phase of an input signal. Based on the phases of the input signal, the shifted signals, and a frequency division output signal, phase frequency detectors (PFDs) generate phase difference signals. In response to the phase difference signals, charge pumps (CPs)... Agent: J C Patents, Inc.

20080218284 - Circuit and method for switching pfm and pwm: The switching method between pulse frequency modulation and pulse width modulation signals is first based on an output voltage of a power transistor to generate a corresponding pulse frequency modulation signal. Next, it is determined whether the corresponding pulse frequency modulation signal has reached its maximal frequency. If so, the... Agent: Oliff & Berridge, Plc

20080211594 - Multi-channel pulse modulator system: The present invention relates to a multi-channel pulse modulator system comprising a pulse modulator circuit, wherein said pulse modulator circuit comprises an N-channel, wherein the modulator output is output from the pulse modulator circuit by means of L output connections of the pulse modulator circuit and where L is less... Agent: Cantor Colburn, LLP

20080211595 - Circuit arrangement for frequency modulation: A circuit arrangement for frequency modulation is provided, which includes a voltage-controlled oscillator having at least one varactor diode that is driven by a drive signal, wherein a capacitance of the varactor diode depends on the drive signal, includes a modulating unit that creates a modulation signal for frequency modulation... Agent: Muncy, Geissler, Olds & Lowe, PLLC

20080211596 - Frequency modulation circuit: Provided is a frequency modulation circuit 1 for outputting a highly precise frequency-modulated signal regardless of variation in a characteristic of a VCO 15. A correction value calculation section 17 calculates a correction value Vt2 based on a voltage value (Vtx−Vt1) resulting from subtracting a control voltage Vt1, which is... Agent: Wenderoth, Lind & Ponack L.L.P.