Shanghai Awinic Technology Co., Ltd

Chiphomer Technology Limited

Hongjun Sun

Wei Yao

Ke Wu

Jiantao Cheng

Liming Du

Haijun Zhang

Zhifei Yang

Tao Cheng

Zhong Zhang

Jianing Zhou

Yongqing Qiao

Disclosed are a digital audio power amplifier and a power amplifier loop. The power amplifier loop comprises an operational amplifier U, a capacitor C, a power amplifier output stage, a resistor R, a resistor Rand a noise control unit, wherein an inverting input end of the operational amplifier Uis respectively connected to one end of the capacitor C, one end of the noise control unit and an output end of a preceding DAC current source; an output end of the operational amplifier Uis respectively connected to a control end of the power amplifier output stage and the other end of the capacitor C; an output end of the power amplifier output stage is successively grounded by means of the resistors R, R; the other end of the noise control unit is connected to a connection point between the resistors R, R; the resistance values of the resistors R, Rare set to satisfy R/R=(N−2)/2, where N>2; the reference voltage of the operational amplifier Uis equal to PVDD/N, with PVDD being a power supply voltage of the power amplifier output stage; and the noise control unit is a resistor module. The present application ensures the normal operation of the digital audio power amplifier.

Digital audio power amplifier and power amplifier loop

A current detection circuit and method for protecting a speaker, and a chip are provided. The current detection circuit includes a current detection module and an analog-to-digital converter. The current detection module samples a current flowing through the speaker based on current mirror technology, and converts the current into a voltage to output a first voltage signal and a second voltage signal. The analog-to-digital converter converts the first voltage signal and the second voltage signal into a PDM code, to calculate a current parameter of the speaker.

Current detection circuit, chip, and current detection method used for speaker protection

A terminal control system and method, and a terminal device are provided. The terminal control system includes: a detection chip and at least one terminal key arranged on a side surface of a terminal device. The detection chip is connected to the terminal key. The terminal key is configured to generate an inductive capacitance and an interelectrode capacitance corresponding to an external control instruction, in response to a reception of the external control instruction. The detection chip is configured to detect the inductive capacitance and the interelectrode capacitance; determine inductive capacitance variation corresponding to the inductive capacitance and interelectrode capacitance variation corresponding to the interelectrode capacitance; determine a control type corresponding to the control instruction according to the inductive capacitance variation and the interelectrode capacitance variation; and trigger the terminal device to perform a control operation corresponding to the control type.

Terminal control system and method, and terminal device

A bootstrap circuit supporting fast charging and discharging and a chip. A voltage measurement module () and a switch module () are arranged, and the voltage measurement module () controls an operating state of the switch module (); during charging, under a specific condition, the switch module () is enabled to be in an on state so as to achieve fast charging of a voltage output end; and during discharging, the purpose of fast discharging is achieved by means of a second field effect transistor (MP) arranged in the bootstrap circuit.

Bootstrap circuit supporting fast charging and discharging and chip

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Shanghai, China

Hongjun Sun