Abstract: An abnormal current protection device includes an overcurrent protector and a controller, and the overcurrent protector includes a short-circuit detection unit and an overcurrent detection unit. The short-circuit detection unit is configured to detect whether there is a short-circuit event within a period of debounce time of a protection cycle. The overcurrent detection unit is configured to detect whether there is an overcurrent event after the period of debounce time within the protection cycle. The controller is configured to disable a converter when the short-circuit event is detected, and disable a power stage when the overcurrent event is detected.

Abstract: An electronic device includes a sampling circuit and a summing circuit coupled with the sampling circuit. The sampling circuit samples a pulse width of a first input pulse of a PWM input signal since a first time point on a rising edge of a clock pulse of a clock signal. The summing circuit generates a first output pulse of a PWM output signal since a second time point on a falling edge of the clock pulse. A pulse width of the first output pulse is a summation of the pulse width of the first input pulse and a pulse width of a second input pulse of the PWM input signal, and the second input pulse is the next pulse after the first input pulse.

Abstract: An electronic device and a method for overcurrent detection are disclosed herein. The electronic device causes a high-side offsetting voltage drop and converts a voltage difference between a first voltage at an input terminal of an upper-bridge power component of a power stage and a sum of a first balancing voltage drop and the high-side offsetting voltage drop into a first current. The electronic device further converts a voltage difference between a second voltage of an output terminal of the upper-bridge power component and a second balancing voltage drop into a second current, compares the first current and the second current, and generates a high-side overcurrent protection (OCP) signal with logic high for a driver of the power stage when the first current is stronger than the second current, such that the driver turns off the upper-bridge power component accordingly.

Abstract: A capacitance measurement circuit includes a charge to voltage converter (CVC) that includes at least one first variable capacitor, an excitation signal generation circuit, a differential amplifier, a first switch circuit, and at least one second variable capacitor, wherein a parasitic capacitance from a sensing capacitance sensed by a capacitance sensor is reduced by the at least one first variable capacitor. The excitation signal generation circuit is arranged to generate and connect a first excitation signal to the capacitance sensor, and generate and connect a second excitation signal to the at least one first variable capacitor, wherein the first excitation signal and the second excitation signal are out-of-phase, and a voltage amplitude of the first excitation signal is different from a voltage amplitude of the second excitation signal. The inverting input terminal of the differential amplifier is arranged to receive the sensing capacitance from the capacitance sensor.

Abstract: An inductor driving device includes multiple switching elements and a control circuit, wherein an inductor is driven according to switching of the multiple switching elements. The control circuit is arranged to generate a control signal for controlling the multiple switching elements. In a first mode, the control signal has a constant frequency. In a second mode, the control circuit adjusts a frequency of the control signal and continuously changes a current direction of the inductor, to generate one of multiple audio signals through the inductor.

Abstract: A voltage mode controlled linear frequency modulation oscillator comprises a voltage modulation circuit, a reference current generating circuit, and an oscillating circuit. The voltage modulation circuit is configured to generate a modulation voltage according to a feedback voltage and a first reference voltage. The reference current generating circuit, coupled to the voltage modulation circuit, is configured to generate a first reference current according to the modulation voltage and a second reference voltage. The oscillating circuit, coupled to the reference current generating circuit, is configured to generate an oscillating signal with an oscillating frequency according to the first reference current, wherein the oscillating frequency varies with the modulation voltage.

Abstract: A driving circuit of a loudspeaker includes a periodic signal generation circuit, a signal processing circuit, a class-D amplifier circuit, a current sensing circuit, and a sample and hold circuit. The periodic signal generation circuit is arranged to generate a periodic signal and a control signal. The signal processing circuit is coupled to the periodic signal generation circuit, and is arranged to generate a pre-driving signal. The class-D amplifier circuit is coupled to the signal processing circuit, and is arranged to drive the loudspeaker according to the pre-driving signal. The current sensing circuit is coupled to the class-D amplifier circuit, and is arranged to generate a current sensing signal. The sample and hold circuit is coupled to the periodic signal generation circuit and the current sensing circuit, and is arranged to sample and hold the current sensing signal according to the control signal, to generate a current sampling signal.

Abstract: A linear charger includes a constant current charging circuit and a thermal regulation circuit. The constant current charging circuit is arranged to generate a charging current, and includes a first transconductance amplifier, wherein the first transconductance amplifier has a positive terminal, a negative terminal, and an output terminal. The thermal regulation circuit is coupled to the output terminal and the negative terminal of the first transconductance amplifier, and is arranged to generate and modulate a thermal regulation current and an amplifier reference voltage with temperature, and transmit the thermal regulation current and the amplifier reference voltage to the output terminal and the negative terminal of the first transconductance amplifier, respectively.

Abstract: A method for estimating a rotor angle and a rotor speed of a permanent magnet synchronous motor (PMSM) includes: receiving a d-axis voltage driving signal of the PMSM, and obtaining a first estimated rotor speed of the PMSM according to the d-axis voltage driving signal; receiving a speed command, and obtaining a second estimated rotor speed of the PMSM according to the speed command; performing a weighting adjustment operation upon the first estimated rotor speed and the second estimated rotor speed to obtain a third estimated rotor speed for estimating the rotor speed of the PMSM; and performing an integration operation upon the third estimated rotor speed to obtain an estimated rotor angle for estimating the rotor angle of the PMSM.

Abstract: A capacitance measure circuit includes a charge to voltage converter (CVC), and the CVC includes an excitation signal generation circuit that is arranged to generate and connect an excitation signal to a first terminal of a capacitance sensor, a differential amplifier, a first switch circuit, and at least one first variable capacitor. The inverting input terminal of the differential amplifier is arranged to receive a sensing capacitance value from a second terminal of the capacitance sensor. The first switch circuit is coupled between the inverting input terminal and the non-inverting output terminal of the differential amplifier, and is connected in parallel with the at least one first variable capacitor at the inverting input terminal and the non-inverting output terminal of the differential amplifier.

Abstract: An audio amplifier with duty ratio control is provided. The audio amplifier comprises a pulse width modulation modulator, a power stage, and a voltage converter. The pulse width modulation modulator is configured to receive an input signal for generating a pulse width modulation signal. The power stage is configured to output an output signal according to a supply voltage and the pulse width modulation signal. The voltage converter is configured to adjust voltage level of the supply voltage according to the pulse width modulation signal. The audio amplifier is configured to adjust the voltage level of the supply voltage when duty ratio of the pulse width modulation signal is greater than a duty ratio threshold.

Abstract: A control method applied to a servomotor, wherein the servomotor includes a motor, and the control method includes: setting a mode of the servomotor as a predetermined mode corresponding to a predetermined communication protocol; receiving an input signal from a controller for controlling the motor, wherein the controller is coupled to the servomotor; and switching the mode of the servomotor from the predetermined mode to one of a plurality of candidate modes according to a frequency of the input signal.

Abstract: A control circuit for controlling a DC-DC converter is provided. The control circuit comprises a first sensor, second sensor, error amplifier, signal conditioning circuit, first comparison circuit, second comparison circuit, and driver circuit. The error amplifier is configured to receive a feedback voltage and a reference voltage for generating a first voltage. The signal conditioning circuit is configured to receive the first voltage for generating a second voltage and a third voltage. The first comparison circuit is configured to make a comparison based on a first sensing signal from the first sensor and the second voltage for generating a first comparison signal. The second comparison circuit is configured to make a comparison based on a second sensing signal from the second sensor and the third voltage for generating a second comparison signal. The driver circuit is for driving a power stage according to the first and second comparison signals.

Abstract: A control circuit for adaptive noise margin control for a constant on time (COT) converter comprises an input reference terminal, amplifier, first switch device, voltage divider, trigger circuit, and output reference terminal. The amplifier has an input terminal coupled to the input reference terminal receiving a reference voltage signal. The first switch device has a control terminal coupled to an output of the amplifier, a first conduction terminal for receiving a voltage source signal, and a second conduction terminal. The voltage divider is coupled to the second conduction terminal and another input terminal of the amplifier. The trigger circuit, coupled to the voltage divider, is for triggering voltage change of a modified reference voltage signal selectively according to a high-side control signal of the COT converter. The output reference terminal coupled to the second conduction terminal outputs the modified reference voltage signal.

Abstract: An audio amplifier includes a plurality of power stages, a driving circuit, and a power stage control circuit. The driving circuit is arranged to drive the power stages. The power stage control circuit includes a feedback circuit and a control circuit. The feedback circuit is coupled to the power stages, and is arranged to generate a feedback signal according to at least one detection input, wherein the at least one detection input includes at least one of a power, a voltage signal corresponding to a switching time of the power stages, and a voltage signal corresponding to a switching frequency of the power stages. The control circuit is coupled between the feedback circuit and the power stages, and is arranged to generate a control signal according to the feedback signal, wherein the control signal is arranged to dynamically control a number of turned-on power stages in the power stages.

Abstract: A capacitance measure circuit includes a charge to voltage converter (CVC), and the CVC includes an excitation signal generation circuit that is arranged to generate and connect an excitation signal to a first terminal of a capacitance sensor, a differential amplifier, a first switch circuit, and at least one first variable capacitor. The inverting input terminal of the differential amplifier is arranged to receive a sensing capacitance value from a second terminal of the capacitance sensor. The first switch circuit is coupled between the inverting input terminal and the non-inverting output terminal of the differential amplifier, and is connected in parallel with the at least one first variable capacitor at the inverting input terminal and the non-inverting output terminal of the differential amplifier.

Abstract: Method and circuit for adaptive column-select line signal generation for a memory device are provided. The method comprises the following steps. A first signal is generated in response to a memory access command. A second signal is generated according to a candidate signal selected from a plurality of candidate signals including a first candidate signal and a second candidate signal, wherein after the first signal is asserted, the first candidate signal is asserted when a configurable time interval with respect to a parameter from a register set elapses and the second candidate signal is asserted when a specified time interval elapses, and the selected candidate signal is asserted before a remaining part of the candidate signals after the first signal is asserted. A column-select line signal is generated according to the first signal and the second signal.

Abstract: An input clock buffer, comprising: a first capacitor; a second capacitor; a first amplifier, configured to generate a first output signal, comprising input terminals coupled to the first capacitor and the second capacitor, wherein the first capacitor and the second capacitor receives a differential input signal; a second amplifier, configured to generate a second output signal according to the differential input signal; a frequency detection circuit, configured to generate a frequency detection signal according to a frequency of the differential input signal; and a switch, located between an output of the first amplifier and an output of the second amplifier, configured to turn on and turn off according to the frequency detection signal.

Abstract: A semiconductor device with contact check circuitry is provided. The semiconductor device includes a plurality of pads, an internal circuit, and a contact check circuit. The plurality of pads includes a first pad and a second pad. The internal circuit is coupled to the plurality of pads. The contact check circuit, at least coupled to the first pad and the second pad, is used for checking, when the semiconductor device is under test, contact connections to the first pad and the second pad to generate a check result signal according to comparison of a first test signal and a second test signal received from the first pad and the second pad with at least one reference signal.

Abstract: An input clock buffer, comprising: a first capacitor; a second capacitor; a first amplifier, configured to generate a first output signal, comprising input terminals coupled to the first capacitor and the second capacitor, wherein the first capacitor and the second capacitor receives a differential input signal; a second amplifier, configured to generate a second output signal according to the differential input signal; a frequency detection circuit, configured to generate a frequency detection signal according to a frequency of the differential input signal; and a switch, located between an output of the first amplifier and an output of the second amplifier, configured to turn on and turn off according to the frequency detection signal.