Abstract: A modulator and associated methods are disclosed for generating a shaped switching output based on an incoming control signal. The modulator includes a limiting amplifier that constrains the amplitude of the input waveform using positive and negative reference inputs, a detector that identifies positive portions or transitions of the limited waveform, and an RC timing circuit that produces a decaying waveform according to a selected time constant. A comparison stage evaluates the decaying waveform against a reference threshold to form a shaped pulse, which is amplified and applied to an output switching stage to drive a load. Depending on the input frequency, duty cycle, and timing relationships, the modulator can produce continuous outputs, discrete pulses, or pulse-width-modulated signals. In various embodiments, the modulator conditions PWM or other command signals for use with inductive or resistive devices such as motors, pumps, or fuel-delivery systems.

Abstract: The present invention encompasses a method of location comprising: using a plurality of signal receivers to receive one or more multiple frequency input signals, wherein said multiple frequency input signals are of unknown origin, and said signal receivers are of known physical location, finding a difference in time of the reception of the signals between each of the signal receivers, using the difference in time of reception to locate the origin of the signals, utilizing the signals locate a signal receiver of unknown location.

Abstract: The present invention encompasses a high efficiency pulse width modulator comprising: a variable duty cycle oscillator for receiving an input signal and providing a low level switching signal; a source voltage differentiation dependant positive switching signal circuit for receiving the low level switching signal, a stable reference signal, a sample of a positive supply voltage signal, and an error signal and the providing a positive supply switching signal and a reference signal; a positive supply switching circuit for receiving the positive supply switching signal and providing an output signal to an inductive load; an output voltage dependant negative supply switching signal circuit for receiving the output signal and a negative supply voltage signal and providing a negative supply switching signal; a negative supply switching circuit for receiving the negative supply switching signal and providing clamping of the inductive load to the negative supply, an output sourced charge pump for receiving the output

Abstract: The present invention encompasses an amplifier system comprising: an input signal port for providing an input signal; a modulating signal source for providing a modulating signal; a first feed forward loop coupled to the input signal port and the modulating signal source, the first feed forward loop modulating the input signal with the modulating signal, amplifying a first modulated input signal, outputting a first amplified modulated signal including distortion signals, and outputting a first difference signal; a first synchronous detection circuit coupled to the first feed forward loop and the modulating signal source, the first synchronous detection circuit outputting a first control signal in response to the first difference signal and the modulating signal, wherein the first control signal controls modulation of the input signal by the modulating signal such that the first difference signal consists of only distortion signals; a second feed forward loop coupled to the first feed forward loop, the second