Abstract: A pulse-width modulation circuit includes an oscillator stage. The oscillator stage includes a first voltage comparator having a first input terminal, a second input terminal and an output terminal. A first capacitor is coupled to the first input terminal of the first voltage comparator. A charging path for the first capacitor is coupled between the first capacitor and the output terminal of the first voltage comparator, the charging path having a first resistance. A discharging path for the first capacitor is coupled between the first capacitor and the output terminal of the first voltage comparator, the discharging path having a second resistance that is different from the first resistance. A duty cycle of a clock signal generated by the oscillator stage is determined based on a first RC time constant for charging the first capacitor and a second RC time constant for discharging the first capacitor.

Abstract: Systems and methods for providing peak current mode control (PCMC) for power converters. Noise immunity is improved by enhancing the signal-to-noise ratio of an inductor (or switch) current to achieve minimum duty cycle resolution and eliminate subharmonic operation that causes high input and output ripples. Current is sensed and translated to a voltage by a current sense resistor for peak current mode control scheme. A direct current (DC) offset voltage is added only during an on-time of the main switch to increase the signal-to-noise ratio. A leading-edge spike caused by turn-on of the main switch is removed by resetting a filter capacitor of a current sense circuit to zero volts after each switching cycle.

Abstract: Systems and methods for providing peak current mode control (PCMC) for power converters. Noise immunity is improved by enhancing the signal-to-noise ratio of an inductor (or switch) current to achieve minimum duty cycle resolution and eliminate subharmonic operation that causes high input and output ripples. Current is sensed and translated to a voltage by a current sense resistor for peak current mode control scheme. A direct current (DC) offset voltage is added only during an on-time of the main switch to increase the signal-to-noise ratio. A leading-edge spike caused by turn-on of the main switch is removed by resetting a filter capacitor of a current sense circuit to zero volts after each switching cycle.

Abstract: The present invention discloses systems and methods for facilitating candidate and subject participation in clinical trial studies. Medical professionals participating in the study at satellite sites assist in recruitment of their pre-existing patients as subjects in the study. Clinical trial data collected from the subjects is communicated over a computer network from the satellite sites to core sites. Study coordination is performed at the core sites. The collected clinical trial data is analyzed in accordance with the study at an interested party site.

Abstract: The present invention discloses systems and methods for facilitating candidate and subject participation in clinical trial studies. Medical professionals participating in the study at satellite sites assist in recruitment of their pre-existing patients as subjects in the study. Clinical trial data collected from the subjects is communicated over a computer network from the satellite sites to core sites. Study coordination is performed at the core sites. The collected clinical trial data is analyzed in accordance with the study at an interested party site.

Abstract: The present invention discloses systems and methods for facilitating candidate and subject participation in clinical trial studies. Medical professionals participating in the study at satellite sites assist in recruitment of their pre-existing patients as subjects in the study. Clinical trial data collected from the subjects is communicated over a computer network from the satellite sites to core sites. Study coordination is performed at the core sites. The collected clinical trial data is analyzed in accordance with the study at an interested party site.