Samsung Electronics Co., Ltd.

Yun-Cheol Han

Ji-hyun Kim

Seoung Jae Yoo

Long Yan

Woo-Kang Jin

Sung Jin Jung

A photoplethysmography sensor that includes a photoelectric conversion element including a first terminal and a second terminal, and that receives light reflected from a blood vessel and generates a current corresponding to the received light, a current-to-voltage converter that receives the generated current through a first input terminal and a second input terminal, and generates an output voltage corresponding to the received current, and a switch that, in response to a control signal of a first level, connects the first and second terminals of the photoelectric conversion element respectively to the first and second input terminals of the current-to-voltage converter and in response to the control signal of a second level different from the first level, connects the first and second terminals of the photoelectric conversion element respectively to the second and first input terminals of the current-to-voltage converter.

Photoplethysmography sensor and semiconductor device including the same

A system and method that generate a vibration motor driving signal includes; a first control unit that receives a first input signal and gain-adjusts the first input signal in response to a reference voltage to generate a first output signal, and a second control unit that receives the first output signal and gain-adjusts the first output signal in response to the reference voltage to generate a second output signal, wherein the second output signal is applied to a vibration motor as the vibration control signal.

System and method generating motor driving signal and method controlling vibration

A method of calibrating the frequency of a g-C filter is provided. The method includes generating, by a frequency calibration circuit, a calibration code capable of tuning a cut-off frequency of the g-C filter according to a frequency of an oscillation signal that is output from a g-C oscillator and indicates a process distribution and a reference code, determining, by the frequency calibration circuit, whether the calibration code exists within a range of a reference code, and outputting, by the frequency calibration circuit, the calibration code to the g-C filter or generating a variable current to simultaneously tune transconductance of the g-C oscillator and transconductance of the g-C filter, according to a result of the determination.

[object Object]

An equalizer, group delay compensation circuit for the equalizer and method of compensating for group delay may improve group delay characteristics in the equalizer. The equalizer circuit may include a first low pass filter configured to filter a received input signal to output a filtered input signal, and a gain control circuit connected to an output terminal of the first low pass filter, and configured to modulate a gain of a transfer function for the equalizer. The equalizer may include a group delay compensation circuit connected to the output terminal of the first low pass filter and configured to compensate for a group delay of the input signal, and a second low pass filter connected to the output terminal of the first low pass filter.

Equalizer, group delay compensation circuit for the equalizer and method of compensating for group delay in the equalizer

Provided is a filter used for an equalizer, the filter including: a first low-pass filter unit receives an input signal and performs low frequency band filtering on the input signal; and an equalization unit that receives an output signal from the first low-pass filter unit. The equalization unit may comprise a plurality of serially connected biquad low-pass filter units, and may control a value of a capacitor that is used to control a group delay value that is generated during equalization. Thus, the filter can compensate for group delay without including a separate all pass filter, thereby reducing surface area and power consumption.

Equalizer filters including a low-pass filter unit and an equalizer having a group delay control unit and related methods

Provided are a frequency synthesizer and a frequency synthesizing method. The frequency synthesizer includes a ring oscillator, duty buffers, half adders, and a switch. The ring oscillator receives a pair of input signals and generates a pair of oscillating signals. The duty buffers receive the pair of oscillating signals of the ring oscillator and generates output signals with predetermined duty cycles. The half adders receive output signals of the duty buffers and generate an output signal as a result of an Exclusive-OR operation on the output signals of the duty buffers and an output signal as a result of an AND operation on the output signals of the duty buffers. The switch selects one of the oscillating signals of the ring oscillator, the output signals as results of the Exclusive-OR operation, and the output signals as results of the AND operation. By using the frequency synthesizer, it is possible to select one of an oscillating-frequency output signal of a high-frequency ring oscillator, an output signal of a high-frequency that is two times higher than that of the oscillating frequency of the ring oscillator bock, and an output signal of a frequency that is the same as that of an input signal.

Growing community of inventors

Yongin-si, South Korea

Yun-Cheol Han