Samsung Electro-mechanics Co., Ltd.

Jun Kyung Na

Sang Hoon Ha

Shinichi Iizuka

Youn Suk Kim

Sang Hee Kim

Chang Hyun Kim

Sung Tae Kim

Sang Wook Park

Jae Hyouck Choi

Seung Seoup Lee

Chul Hwan Yoon

Seung Chul Pyo

Iizuka Shinichi

Il Kwon Chung

Young Kil Choi

Disclosed herein is an apparatus for driving a gyro sensor including a driving displacement signal processing unit, a sensing signal processing unit and an automatic quadrature signal controller configured to control the variable resistor through digital correction when a quadrature signal exists, and minimize an amplitude of the quadrature signal.

Apparatus for driving gyro sensor and control method thereof

Disclosed herein is a power amplifier system including: a power amplifier; a power controlling unit providing driving voltage and driving current corresponding to a preset reference voltage to the power amplifier; a current controlling unit performing a control so that control current corresponding to applied control voltage flows; a bias controlling unit detecting current and voltage corresponding to the driving current of the power controlling unit and controlling bias current of the power amplifier according to the detected voltage; and a current adjusting unit detecting bias voltage corresponding to the bias current of the power amplifier and adjusting the driving current of the power controlling unit according to the detected bias voltage. Even though applied control voltage increases, current applied to the power amplifier is appropriately adjusted, thereby making it possible to improve characteristics of the power amplifier.

Power amplifier system

There is provided a power amplifier. The power amplifier includes an amplification unit including at least one amplification device; a power generation unit generating an input signal supplied to the amplification unit; and a bias circuit unit controlling bias of the at least one amplification device according to the input signal, wherein the bias circuit unit supplies a predetermined bias voltage to the amplification unit before the input signal is applied to the amplification unit. According to the embodiments of the present invention, a delay phenomenon occurring at an initial driving time or a low power mode may be significantly reduced by supplying a predetermined bias signal to an amplification unit in a standby circuit before the bias circuit unit of the power amplifier normally outputs the bias signal to the amplification unit.

Power amplifier

There is provided a fingerprint detection sensor and a method of detecting a fingerprint. The fingerprint detection sensor according to embodiments of the present invention includes a plurality of piezoelectric sensors arranged on a two-dimensional plane; and a fingerprint detection unit detecting a fingerprint by using ultrasonic signals discharged from the plurality of respective piezoelectric sensors, wherein the fingerprint detection unit determines whether the fingerprint is a forged fingerprint by detecting bloodstreams within a first region on the two-dimensional plane in which the ultrasonic signals discharged from the plurality of respective piezoelectric sensors overlap one another.

Fingerprint detection sensor and method of detecting fingerprint

A level shifter includes: a first buffer amplifier transferring a preset reference voltage to a first output terminal; a second buffer amplifier connected in parallel to the first buffer amplifier and transferring an input voltage to a second output terminal; a positive feedback amplifier connected in parallel to the first buffer amplifier and the second buffer amplifier, and amplifying the input voltage by a preset gain to transfer the amplified input voltage to a third output terminal; and a level regulation unit regulating levels of output signals of the first buffer amplifier, the second buffer amplifier, and the positive feedback amplifier and providing the regulated output signals to a common output node.

Level shifter

There is provided a power amplifying apparatus with dual-current control mode, including: a transistor mirror circuit adjusting currents respectively flowing through a main path and a mirror path connected in parallel to a power source terminal; a resistor mirror circuit adjusting the respective currents of the main path and the mirror path; a current controlling unit controlling a control current flowing through the main path with a pre-set constant current; a voltage adjusting unit providing a bias adjustment signal that corresponds to a difference voltage between a first voltage of a first node on the main path to which a current is output from the resistor mirror circuit and a second voltage of a second node on the mirror path to which a current is output from the resistor mirror circuit; and a bias circuit unit adjusting a bias of a power amplifying unit.

Power amplifying apparatus with dual-current control mode

A power control system includes a power regulator having a plurality of power PMOS transistors connected to a power source in parallel and configured to supply current and voltage controlled according to an input lamp voltage, a current sensing unit connected to the power source and configured to sense currents flowing through a plurality of target PMOS transistors located at predetermined positions among the PMOS transistors, a current mirror unit connected to a first regulated voltage terminal and configured to generate a plurality of currents equal to the sensed currents, a comparator unit configured to total the generated currents to convert the totaled currents into a voltage, and to generate a voltage difference between the voltage and a predetermined reference voltage, and a current bias circuit unit connected to a second regulated voltage terminal and configured to control a bias current according to the generated voltage difference.

Power control system and power amplification system using the same

Provided is a voltage level shifter changing an input voltage level and outputting the input voltage. There is provided the voltage level shifter, including: an operational amplifier having a first input having an applied input voltage thereto; a first MOSFET having a gate connected to an output of the operational amplifier, a source having an applied power thereto, and a drain outputting an output voltage; a voltage dividing resistor unit including a plurality of voltage dividing resistors sequentially connected to the drain of the first MOSFET in series, one connection node between the plurality of voltage dividing resistors being connected to the second input of the operational amplifier; and a second MOSFET having a source and a drain, respectively connected to both ends of at least one of the voltage dividing resistors, and a gate connected to the gate of the first MOSFET.

Voltage level shifter

There is provided a power amplifying apparatus including: a power amplifier; a power regulator providing a driving voltage and a driving current corresponding to a control voltage to the power amplifier; a current sensing unit sensing a current and a voltage corresponding to the driving current and controlling the driving voltage according to the sensed current; a current control unit controlling a current bias according to the sensed voltage of the current sensing unit; and a current bias circuit unit controlling a bias current of the power amplifier according to the controlling of the current control unit.

Power amplifying apparatus

There is provided an analog circuit having improved response time. An analog circuit having improved response time may include: a low level limiter converting a signal having a lower level than a predetermined reference level into a signal having a predetermined non-low level higher than the predetermined reference level; and an analog circuit section amplifying the signal from the low level limiter into a signal having a predetermined level.

Analog circuit having improved response time

A low-dropout regulator includes: a first operational amplifier having a first input receiving an input voltage; a first P-channel MOSFET having a gate connected to an output of the first operational amplifier, a source connected to a power source terminal, and a drain connected to an output terminal; a feedback circuit providing at least portion of a voltage of the output terminal as a feedback to a second input of the first operational amplifier; and a triode limiter circuit receiving voltages at the source and the gate of the first P-channel MOSFET comparing a voltage difference therebetween with a predetermined reference voltage, and increasing a voltage of the second input of the first operational amplifier when the voltage difference is the same as the reference voltage.

Growing community of inventors

Gyunggi-do, South Korea

Jun Kyung Na