Abstract: An on-timing circuit includes a current generation module, an inversion delay counteracting module, a capacitor, and a comparator, wherein the current generation module is configured to generate a charging current in direct proportion to a voltage of a switch node after an upper power transistor is turned on; the inversion delay counteracting module is configured to generate a first delay for counteracting an inversion delay of the comparator according to a variable resistance unit and the capacitor, and a resistance value of the variable resistance unit is controlled by an input voltage; the capacitor is configured to be charged by the charging current after the upper power transistor is turned on; and the comparator is configured to compare a ramp voltage corresponding to a ramp voltage node with a first voltage and generate a turn-off signal, and the first voltage is a reference voltage in proportion to an output voltage.

Abstract: An oscillator circuit includes a frequency setting circuit, a first and a second clock signal generating circuit, a clock synchronization circuit, a control circuit, and an output circuit. The first and second clock signal generating circuits generate first and second clock signals respectively. The control circuit outputs a frequency setting signal via a second node, outputs the first clock signal via a sixth node, and outputs the second clock signal via a seventh node when the first frequency selecting signal is at an effective voltage level; otherwise, outputs a second synchronization control signal via the second node, outputs an external synchronization clock signal via the sixth node, and outputs a first clock signal via the seventh node. The clock synchronization circuit generates the first and second synchronization control signals. The output circuit outputs the first or second clock signal.

Abstract: An oscillator circuit includes a frequency setting circuit, a first and a second clock signal generating circuit, a clock synchronization circuit, a control circuit, and an output circuit. The first and second clock signal generating circuits generate first and second clock signals respectively. The control circuit outputs a frequency setting signal via a second node, outputs the first clock signal via a sixth node, and outputs the second clock signal via a seventh node when the first frequency selecting signal is at an effective voltage level; otherwise, outputs a second synchronization control signal via the second node, outputs an external synchronization clock signal via the sixth node, and outputs a first clock signal via the seventh node. The clock synchronization circuit generates the first and second synchronization control signals. The output circuit outputs the first or second clock signal.

Abstract: A cross-modal retrieval method includes extracting a text label and a text feature of a retrieval text; determining, based on the text label and a visual label of retrieved visual data, whether at least one piece of first visual data whose visual label matches the text label exists in the retrieved visual data, where the retrieved visual data includes an image and/or a video; determining, based on the text feature and a visual feature of the retrieved visual data, whether at least one piece of second visual data whose visual feature matches the text feature exists in the retrieved visual data; and determining a retrieval result when the at least one piece of first visual data and the at least one piece of second visual data exist in the retrieved visual data.