Abstract: An oscillator formed from low cost discrete semiconductors and passive devices creates a linear periodic ramp of constant frequency with ramp slope based on an external voltage signal. Parameters are stable over a wide range of temperatures and variations of transistor parameters that normally degrade in extreme environments. The oscillator period can be phase and frequency synchronized to an external clock source over a wide range of frequencies. The oscillator ramp generator phase can be synchronized on a cycle by cycle basis for incorporation in power converters employing spread spectral EMI reduction techniques, multi-converter systems employing clock interleaving for distribution bus filter optimization, and resonant mode converters employing zero voltage switching techniques. Oscillator ramp rate is independent of frequency and can be synchronized to DC (inhibit) for use in ultra low power burst mode power conversion.

Abstract: Disclosed is a method for generating an oscillating signal and an oscillator circuit.

Abstract: In one embodiment, an oscillator circuit is configured to oscillate at a base frequency. The oscillator is configured to receive a synchronization signal and restart a period of the oscillator signal responsively to the synchronization signal.

Abstract: An oscillator structure has a sync signal processor with an input interface for an external clock based sync signal and an output interface for a duty cycle indication signal depending on a signal property of the sync signal and an oscillator with an input interface for the duty cycle indication signal and the sync signal and an output interface for an oscillation signal synchronized with the external clock and having a duty cycle adjusted according to the duty cycle indication signal.

Abstract: An oscillator operated with an external power source or an external save power source is provided comprising: a clock signal generation unit for generating and outputting a clock signal; a power-on detection unit for detecting the power-on of the external power source; a power-off detection unit for detecting the power-off of the external power source; a running time count unit for counting the running time from a time of the power-on detection signal being input to a time of the power-off detection signal being input; storage means for storing accumulated running time up to a power-on time of the external power source; and a control unit for reading the running time at the time of the power-off detection signal being input, reading the accumulated running time from the storage means, adding the running time to the accumulated running time, and storing the addition result as a new accumulated running time in the storage means.

Abstract: A ring oscillator, such as a bipolar ring oscillator with enhanced, fast startup and shutdown includes a series of a plurality of inverting differential stages connected in a loop. The plurality of inverting differential stages includes a first multiplexer stage. The first multiplexer stage includes a first signal input, a second signal input and a select input. An oscillator feedback signal is applied to the first signal input of the first multiplexer stage. A startup circuit is coupled to the first multiplexer stage. The startup circuit includes a differential signal coupled to the second signal input of the first multiplexer stage for starting the bipolar ring oscillator. The startup circuit applies a full differential switching voltage signal to the second signal input of the first multiplexer stage to guarantee start of the bipolar ring oscillator after one delay of the series of the plurality of inverting differential stages connected in the loop.

Abstract: An oscillation circuit having multiple separately addressable oscillator stages for applying RF voltage across selected capacitive loads where each stage includes a power driver, a transformer and a quench/clamp circuit. The oscillation circuit includes one enablement circuit responsive to an externally applied enablement signal and address signal and a common feedback circuit connected between one end of all of the transformers and the enablement circuit. An externally applied address signal and an enable signal selects a particular oscillator stage and initiates action of a power/driver circuit to provide an initial pulse of AC current through the associated transformer for a preset period and the feedback circuit detects negative zero crossovers of the waveform of current through that transformer primary to maintain actuation of the driver circuit for as long as the external enable signal is present.

Abstract: A device for use as a self-oscillating Class D transmitter is disclosed which uses feedback to maintain the oscillation at the resonant frequency of the device, thereby optimizing the efficiency of operation and overcoming the frequency mismatching inherent in previously known transmitters. The device uses a series LC combination which is driven by a comparator and a tri-state logic driver, with a feedback loop using a differentiator used to switch the polarity of the square wave generator. The system thus self-oscillates at the resonant frequency of the capacitor and inductor, even when the inductance of the inductor is varied by the inductor coming into close proximity to another inductor.

Abstract: A Gaussian noise generator having a sample and hold circuit connected to the output thereof for providing random voltage samples, a voltage controlled oscillator controlled by the random voltage samples and providing a linear 10 sawtooth output having a frequency dependent upon the amplitude of the random voltage samples, and a second sample and hold circuit connected to the oscillator to provide random voltage output samples with substantially uniform distribution between predetermined limits.