Patent application number | Description | Published |
20090184699 | POWER SUPPLY APPARATUS AND POWER SUPPLY METHOD - A power supply apparatus is described that includes a first switch, a second switch, a first comparator, a signal generator and a controller. The first switch is provided between an inductor and a terminal having a reference voltage. The second switch is provided between the inductor and an output terminal. The first comparator compares an input voltage and a first comparison voltage. The signal generator outputs a frequency signal based on an output of the first comparator. The first controller controls current flowing into the inductor by controlling the first switch and the second switch based on the output of the signal generator. | 07-23-2009 |
20090201618 | POWER SUPPLY CIRCUIT, OVERCURRENT PROTECTION CIRCUIT FOR THE SAME, AND ELECTRONIC DEVICE - A power supply circuit includes an output transistor including a source coupled to power supply voltage, and a drain from which output voltage is outputted; a first error amplifier powered by the power supply voltage and outputting a signal based on a potential difference between the output voltage and a reference voltage; a buffer transistor including a gate coupled to the output of the first error amplifier, and a source coupled via a constant current source to the power supply voltage and coupled to a gate of the output transistor; a current detection transistor coupled to the output transistor such that a gate and source are shared; and an overcurrent protection circuit configured to limit the drain current of the buffer transistor based on the increase of the drain current of the current detection transistor and thereby control the output current of the output transistor. | 08-13-2009 |
20100090673 | POWER SUPPLY APPARATUS AND POWER SUPPLY METHOD - A power supply apparatus is provided which includes: a first switch provided between an inductor and a terminal to which a reference voltage is applied; a second switch provided between the inductor and an output terminal; a first comparator circuit that compares an input voltage with a first comparison voltage; a signal generating circuit that outputs a frequency signal according to an output from the first comparator circuit; and a first control circuit that controls the first and second switches based on an output from the signal generating circuit to control an electrical current flowing into the inductor. | 04-15-2010 |
Patent application number | Description | Published |
20100046339 | OPTICAL DISC RECORDING/REPRODUCTION APPARATUS - The present invention solves the problems that, in a detection circuit which is mostly configured by analog circuits, the chip size cannot be reduced even using a highly-precise processing, there are many external capacitors and terminals thereof, a plurality of high-speed and large-scale AD converters are required for digitization, the detection precision of a small amplitude signal superimposed on an RF signal is deteriorated, and high-speed sample/hold is required. | 02-25-2010 |
20100195456 | OPTICAL DISC CONTROL DEVICE - There is provided an optical disc control device which can perform stable repetitive control without deteriorating the followability of a target value when performing jumping, retry, and long seek. The optical disc control device comprises an adder which receives a compensation target signal having a periodic frequency component, which is read out from an optical disc; a filter which outputs a signal component included in an arbitrarily determined learning frequency band in the output signal of the adder; a memory which successively updates and stores the output signal of the filter; a gain element which multiplies signal information outputted from the memory by a gain which is not less than 0 and not larger than 1, and inputs the product to the adder; a rotation speed detector which detects the rotation speed of the optical disc; a disc position detector which detects the position of the pickup on the optical disc; a circumferential direction move amount calculator which calculates the move amount of the pickup in the circumferential direction on the optical disc; and a memory controller which control the addresses for reading out the signal information stored in the memory on the basis of the circumferential direction move amount which is calculated by the circumferential direction move amount calculator. | 08-05-2010 |
20110215795 | DETECTOR AND DETECTION METHOD - A detector obtains an output signal from an input signal containing a target signal and outputs the output signal. The detector includes an amplifier configured to receive the input signal and the output signal, compare the input signal to the output signal to output a comparison result; an envelope generator configured to weight a first value and a second value having a sign opposite to that of the first value in accordance with the comparison result, integrate the weighted first value and the weighted second value, and output an integration result as the output signal; and a controller configured to control the envelope generator in accordance with the input signal. The controller controls the envelope generator to mitigate an increase in an absolute value of the integration result when the input signal contains a frequency component other than a frequency component of the target signal. | 09-08-2011 |
20110216639 | DETECTOR AND DETECTION METHOD - The present disclosure improves tracking characteristics of an envelope detected from an input signal to the input signal. A detector, which obtains an output signal from an input signal containing a target signal, and outputs the output signal, includes: a comparator configured to compare the input signal to the output signal, and output an obtained comparison result; and an envelope generator configured to weight a first value and a second value having a sign opposite to that of the first value in accordance with the comparison result, integrate the weighted first value and the weighted second value, and output an integral value as the output signal. The envelope generator includes a first gain generator configured to output the first value in accordance with an amplitude of the input signal. | 09-08-2011 |