Shenzhen Goodix Technology Co., Ltd.

Si Herng Ng

Wen-Chi Wang

Chenyang Kong

The present application discloses a PPG circuit, a biological characteristics detection device and a biological characteristics detection method. The PPG circuit is configured to control a light source and N photoelectric converters to sense biological characteristics of an object under test; the PPG circuit includes: a transmitting channel, K receiving channels, wherein the N photoelectric converters are divided into K sets of photoelectric converter sets, and the K receiving channels respectively correspond to K sets of photoelectric converter sets; and a controller, configured to control the PPG circuit to operate in a partial sampling phase or an full sampling phase, so as to generates J or K biological characteristics sampling results during each of the pulse repetition cycles.

Photoplethysmogram circuit, biological characteristics detection device and biological characteristics detection method

Some embodiments of the present disclosure relate to electronic technologies, and provide a detection circuit. According to embodiments of the present disclosure, the detection circuit includes a first load module, a second load module, a third load module, a first detection module, a second detection module, and an obtaining module. A first end of the first detection module is connected to a junction between a first detection electrode and the first load module, a second end of the first detection module is connected to the obtaining module, a first end of the second detection module is connected to a junction between a second detection electrode and the second load module, and a second end of the second detection module is connected to the obtaining module.

Detection circuit, ECG detection apparatus, and wearable device

The present application discloses a data converter (). The data converter includes an input terminus (), a digital-to-analog (D/A) converter () and a mapping unit (). The input terminus is configured to receive an input signal. The D/A converter includes a plurality of D/A converter units configured to generate an output signal. The mapping unit is coupled between the input terminus and the D/A converter and is configured to cause the plurality of D/A conversion units to be equivalently arranged in a relative order in which the plurality of D/A conversion units are gated according to specific electrical characteristics of the plurality of D/A conversion units for digital-to-analog conversion. The present application further provides an A/D converter, a D/A converter and a related chip.

Data converter and related analog-to-digital converter, digital-to-analog converter and chip

The present application discloses an ADC (). The ADC has an A/D conversion operation mode and a measurement operation mode. The ADC includes an input terminal (), a DAC (), and an output terminal (). The input terminal is configured to receive an analog signal. The output terminal is configured to output a digital signal. The DAC includes a plurality of D/A conversion units. When the ADC operates in the A/D conversion operation mode, the ADC is configured to convert the analog signal into the digital signal, and when the ADC operates in the measurement operation mode, the digital signal related to a ratio of a capacitance of the D/A conversion unit to be measured to a total capacitance of the plurality of D/A conversion units.

Analog-to-digital converter and associated chip

An operational amplifier includes: a first amplifier stage, configured to generate first output voltages according to first input voltages; a second amplifier stage, configured to generate second output voltages according to the first output voltages; a second output stage circuit, configured to replicate an equivalent or a scaled-down version of the first output stage circuit; a first common-mode feedback circuit, configured to keep an output common-mode voltage of the second output stage circuit at a predetermined value; a logic loop circuit configured to, when the operational amplifier operates in a direct current calibration phase, adjust a difference between the first output voltages; a bias circuit, configured to generate a voltage close to a common-mode voltage of the first output voltages produced after the operational amplifier is turned on, the voltage serving as a reference voltage of a second common-mode feedback circuit.

Operational amplifier and control method thereof

The application provides a charge pump circuit, includes a digital control circuit, coupled to the switch module, configured to receive a up digital signal and a down digital signal, and adjust a first output voltage to a voltage level of an input voltage and adjust an second output voltage to a ground voltage level according to the up digital signal and the down digital signal; a digital-to-analog converter (DAC), configured to generate a corresponding up reference voltage and a corresponding down reference voltage according to the up digital signal and the down digital signal; and a voltage follower, comprising a plurality of operational amplifiers and a plurality of transistor switches, configured to lock the first output voltage and the second output voltage according to the up reference voltage and the down reference voltage; wherein the up digital signal and the down digital signal are varied with time.

Charge pump circuit and controlling method thereof

The application provides a charge pump circuit, including a switch module, including a plurality of switches and a soft ramp-up switch, configured to generate a first output voltage and a second output voltage according to an input voltage; and a digital control circuit, coupled to the switch module, configured to receive a up digital signal and a down digital signal, and adjust the first output voltage to a voltage level of the input voltage and adjust the second output voltage to a ground voltage level according to the up digital signal and the down digital signal. The charge pump circuit of application has advantages of minimizing inrush currents to avoid circumstances of distortions caused by the pop noises or clipping and optimizing the efficiency of the amplifier.

Growing community of inventors

Guangdong, China

Si Herng Ng