Samsung Electronics Co., Ltd.

Dong Jin Keum

Hyun Seok Shin

Hoang Quoc Duong

Byung Chul Jeon

Kudo Ryotaro

Jin Sub Choi

Yus Ko

Hwa Yeal Yu

Sung Woo Moon

Ji Soo Jang

Ju Young Han

A fuel gauge system for measuring the amount of current in a battery is provided. The fuel gauge system includes a first resistive element connected in series to the battery, a second resistive element connected in series to the first resistive element, a first switch connected in parallel to the second resistive element to control a current flowing in the second resistive element, a second switch connected in series to the second resistive element to control the current flowing in the second resistive element, a controller configured to output a first switching signal to the first switch and output a second switching signal to the second switch, and a fuel gauge circuit configured to measure a battery current flowing in the first resistive element and the second resistive element.

Fuel gauge system for measuring the amount of current in battery and portable electronic device including the same

A voltage regulator may include an error amplifier configured to amplify a difference between a reference voltage and a feedback voltage and generate a first amplified voltage based thereon; a power transistor between a second voltage supply node and an output node of the voltage regulator, the power transistor including a gate configured to receive a gate voltage; a buffer between a first voltage supply node and a ground, the buffer configured to generate the gate voltage based on the first amplified voltage; a voltage divider between the output node and the ground, the voltage divider configured to generate the feedback voltage based on the output voltage; and a control circuit configured to connect the output node to the ground through the gate of the power transistor based on the output voltage and the gate voltage.

Voltage regulator for suppressing overshoot and undershoot and devices including the same

A voltage regulator is provided that includes an error amplifier circuit having a reference voltage input port that receives a reference voltage, N input ports, N output ports, and N power transistors, where N is a positive integer that is greater than or equal to 2. Each of the power transistors has a gate that is connected to one of the N output ports. The error amplifier amplifies a difference between the reference voltage and each of N respective feedback voltages input to the N input ports, respectively, and outputs amplified voltages to the respective N output ports.

Voltage regulator and integrated circuit including the same

The switching regulator includes a voltage-to-current converter to convert a noise voltage into a noise current and output the noise current; and a sawtooth generator to output a sawtooth voltage signal having a frequency that varies in response to the noise current output from the voltage-to-current converter.

Switching regulator with reduced EMI

A DC offset correction circuit includes a DC offset detector generating a detection voltage based on a result of a comparison of a first reference voltage and a voltage difference between signals input to the DC offset detector, a comparator comparing a second reference voltage and the detection voltage and a third reference voltage and the detection voltage and outputting first and second comparison signals, respectively, as a result of the comparisons, and an up/down counter performing an up or a down count operation in response to one of the first or second comparison signals and, as a result of the up or down count operation, outputting a signal that causes at least one control signal for canceling a DC offset in a signal input to a receiver to be generated.

DC offset correction circuit for canceling a DC offset in a real time and a receiving system having the same

A PLL circuit for two point modulation includes a first loop filter, a second loop filter, a plurality of switching devices, and a calibration module. The first loop filter filters an output voltage of a charge pump during a gain calibration operation. The second loop filter filters the output voltage of the charge pump during a normal operation. The first loop filter has a bandwidth wider than that of the second loop filter to perform a fast calibration by reducing a lock time. The operation of the first loop filter, the operation of the second loop filter, and the opening of the first loop filter are determined by the switching operations of the switching devices. The calibration module adjusts a gain of analog modulation data based on a frequency error accumulated in the first loop filter after the first loop filter is open during the gain calibration operation.

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Suwon-si, South Korea

Dong Jin Keum