摘要:
The present invention discloses an on-time control module for compensating a switching frequency in a switching regulator. The on-time control module includes an average voltage generating circuit, for generating an average voltage related to a duty according to an input voltage and the duty, and an on-time controller, for generating a control signal of an on-time related to the duty according to the input voltage and the duty voltage.
摘要:
The present invention discloses an on-time control module for compensating a switching frequency in a switching regulator. The on-time control module includes an average voltage generating circuit, for generating an average voltage related to a duty according to an input voltage and the duty, and an on-time controller, for generating a control signal of an on-time related to the duty according to the input voltage and the duty voltage.
摘要:
A duty cycle generator for generating a duty cycle signal to a power converter is disclosed. The duty cycle generator includes a first inverter, a second inverter, a signal protection unit including an input terminal coupled to the duty cycle signal for generating a break pulse to generate a protected duty cycle signal, a comparator for comparing a triangle-wave signal with a comparison signal to generate a comparison result, a NOR gate for generating a reset signal according to the comparison result and the protected duty cycle signal, an SR-latch for outputting a turn-on signal according to the clock signal and the reset signal, and an AND gate for generating the duty cycle signal according to the inverted clock signal and the turn-on signal.
摘要:
Constant on-time control circuit includes a comparing circuit including a comparator including a positive input end for receiving a control voltage; a negative input end for receiving a feedback voltage from the output voltage of the DC/DC converter; and an output end for outputting a comparing signal; and a voltage adjusting circuit coupled to the output end of the comparator for adjusting the control voltage; and a pulse generator coupled to the output end of the comparator for generating a pulse signal to control a switch set of the DC/DC converter according to the comparing signal.
摘要:
A dynamic random access memory cell having vertical channel transistor includes a semiconductor pillar, a drain layer, an assisted gate, a control gate, a source layer, and a capacitor. The vertical channel transistor has an active region formed by the semiconductor pillar. The drain layer is formed at the bottom of the semiconductor pillar. The assisted gate is formed beside the drain layer, and separated from the drain layer by a first gate dielectric layer. The control gate is formed beside the semiconductor pillar, and separated from the active region by a second gate dielectric layer. The source layer is formed at the top of the semiconductor pillar. The capacitor is formed to electrical connect to the source layer.
摘要:
Constant on-time control circuit includes a comparing circuit including a comparator including a positive input end for receiving a control voltage; a negative input end for receiving a feedback voltage from the output voltage of the DC/DC converter; and an output end for outputting a comparing signal; and a voltage adjusting circuit coupled to the output end of the comparator for adjusting the control voltage; and a pulse generator coupled to the output end of the comparator for generating a pulse signal to control a switch set of the DC/DC converter according to the comparing signal.
摘要:
A method and an apparatus for deciding a spherical aberration compensation (SAC) value for an optical storage medium are provided. The optical storage medium comprises at least one recording layer and a cover layer. The SAC value is suitable for a selected one of the at least one recording layer. First, a focus search on the optical storage medium is performed to derive a focus error (FE) signal in response to a testing SAC value. Then, a center level and a center basis corresponding to the testing SAC value according to the FE signal is determined. The SAC value according to the center level, the center basis, and the testing SAC value is also determined. When the center level and the center basis are equal, the SAC value is determined to be the testing SAC value.
摘要:
The present invention discloses a sigma-delta modulator architecture capable of automatically improving dynamic range and a method for the same. Based on the concept that different dynamic ranges of a sigma-delta modulator can be obtained via adjusting the signal power gain thereof, the present invention provides a novel algorithm to implement an automation program. The present invention finds out several sets of dynamic-range curves to improve the overall dynamic range. Via a high-level sigma-delta modulator architecture, the present invention can calculate the required feedforward coefficients. Further, the present invention install in the sigma-delta modulator architecture with four additional components, including a peak detection unit, a comparator unit, a digital coefficient control unit and a switch unit, to dynamically detect the output of the sigma-delta modulator and dynamically modify the feedforward coefficient of the sigma-delta modulator. Thus is extended the dynamic range of the sigma-delta modulator.
摘要:
An optical storage system modulates a laser beam based on a high frequency modulation (HFM) signal and a pattern to be recorded on an optical storage medium. At least one of an amplitude and a frequency of the HFM signal is adjusted when using the light beam to record the pattern on the optical storage medium or read data from the medium.
摘要:
An enhanced wavelength-converting structure is disclosed. The enhanced wavelength-converting structure includes a substrate, a wavelength-converting layer arranged next to the substrate, and a wavelength-selective reflecting layer arranged next to the wavelength-converting layer. The wavelength-converting layer converts the first light into the second light. A part of the second light radiating backward to the light source is further reflected toward the substrate by the wavelength-selective reflecting layer to form the enhanced second light by combining with another part of the second light radiating toward the substrate.