Samsung Electronics Co., Ltd.

Sogang University Corporation

Eun-seok Shin

Kyung-Hoon Lee

Seung-hoon Lee

Michael Choi

Do-Hyung Kim

Seung-Hoon Lee

Young-Ju Kim

Jae-Jin Park

Hee-Cheol Choi

Young-Jae Cho

Kyung-hoon Lee

Kang-Jin Lee

Min-young Kang

Se-ra An

Yong-min Kim

Ho-jin Park

Kyoung-jun Moon

Se-won Lee

Beom-soo Park

A level shifter for outputting an output voltage having a voltage level range different from a voltage level range of a received input voltage is disclosed. The level shifter includes: a current mirror configured to copy a reference current flowing through a first mirror transistor to a second mirror transistor; a current mirror control circuit electrically connected to the current mirror by a sink node and including a plurality of control transistors configured to control the current mirror; and an output circuit configured to output an output voltage based on a voltage level of the sink node, wherein a first control transistor of the plurality of control transistors receives the output voltage fed back to a gate terminal of the first control transistor, and a second control transistor of the plurality of control transistors receives an inverted output voltage fed back to a gate terminal of the second control transistor.

Level shifter and semiconductor device including the same and operation method thereof

A resonator oscillator that may be included in a gas sensing system may include an oscillator that may be electrically connected to an external resonator through a conductive line. The oscillator may generate an oscillating signal having a frequency corresponding to a resonance frequency of the external resonator in an oscillating path. A spurious resonance removal circuit on the oscillating path may remove spurious resonance caused by the conductive line from the oscillating path. A gas sensing system may include the oscillator, a resonator that includes a sensor configured to sense a gas, and a frequency counting logic that receives the oscillating signal and a reference clock signal, performs a counting operation on the oscillating signal according to a logic state of the reference clock signal to generate a counted value, and generate a gas sensing output indicating a sensed gas based on the counted value.

Film bulk acoustic resonator oscillators and gas sensing systems using the same

A multistage amplifying circuit includes a first amplifying circuit that either samples a first analog voltage input or amplifies a difference between the first analog voltage and a first digital voltage converted from the first analog voltage, in response to a control signal. A second amplifying circuit either samples a second analog voltage input or amplifies a difference between the second analog voltage and a second digital voltage converted from the second analog voltage, in response to the control signal. A common amplifier receives output voltages of the first amplifying circuit and the second amplifying circuit and either resets the output voltage of the first amplifying circuit and determines an output voltage by using the second amplifying circuit, or resets the output voltage of the second amplifying circuit and determines an output voltage by using the first amplifying circuit, in response to the control signal.

Multistage amplifying circuit

A low-voltage operational amplifier includes a differential amplifying stage, an output amplifying stage and a compensation stage. The differential amplifying stage amplifies a difference between a first signal and a second signal that constitute a differential pair using an input pair of NMOS transistors, and outputs an amplified first signal and an amplified second signal. The output amplifying stage amplifies a difference between the amplified first signal and the amplified second signal using an input pair of PMOS transistors, and outputs a first output signal and a second output signal that constitute a differential pair. The compensation stage receives the amplified first signal, the amplified second signal, the first output signal, and the second output signal, and reduces a settling time of the first output signal and the second output signal.

Low-voltage operational amplifier and operational amplifying method

In a capacitor and a capacitor array configured for reducing an effect of parasitic capacitance, the capacitor array can have a matrix configuration that includes a plurality of unit capacitors. The unit capacitors include a lower electrode and an upper electrode that constitute a plate capacitor, as well as shielding structures which enclose the capacitor. The unit capacitors are connected by an upper electrode connecting line with a first direction to constitute a plurality of capacitor columns, wherein the unit capacitors are also arranged in rows, in a second direction perpendicular to the first direction, and wherein lower electrode lead lines are disposed between the capacitor columns, the lower electrode lead lines being connected to the respective lower electrodes of each of the unit capacitors.

Capacitor and capacitor array

Growing community of inventors

Seoul, South Korea

Eun-seok Shin