Shanghai Awinic Technology Co., Ltd

Haijun Zhang

Liming Du

Jiantao Cheng

Zhifei Yang

Wei Yao

Hongjun Sun

Jianing Zhou

Yongqing Qiao

Shaojun Guan

Ziqing Lu

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 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

The present disclosure provides a current detection circuit for a loudspeaker, comprising a first detection resistor RSP, a second detection resistor RSN, a sampling selection circuit, an input selection circuit, and a processing circuit. By adding the sampling selection circuitand the input selection circuit, voltages on two ends of the corresponding detection resistors (RSP, RSN) are sampled according to the fact that potential differences of an output stage VOP and an output stage VON of a class-D audio power amplifierare in different semi-periods, and the current of the loudspeakeris obtained through processing, thereby detecting the current of the loudspeakerwithout adding an anti-clipping distortion function to the class-D audio power amplifier

Current detection circuit for loudspeaker

A detection circuit and an electronic device using the detection circuit are provided. The detection circuit includes a fourth branch, a fifth branch and a third energy storage unit. The fourth branch includes multiple fourth switches, and the fifth branch includes multiple fifth switches. A preset electrical signal threshold is sampled and applied to the third energy storage unit by controlling the multiple fourth switches in the fourth branch, and a voltage difference between two detection terminals of a first energy storage unit is sampled and applied to the third energy storage unit by controlling the multiple fifth switches in the fifth branch, to compare the voltage difference between the two detection terminals with the preset electrical signal threshold.

Detection circuit and electronic device using the same

An open-loop charge pump is provided. In the open-loop charge pump, a peak current limiting control circuit is arranged between a control circuit and a boost circuit. The control circuit drives the peak current limiting control circuit based on an over-voltage protection signal to control the boost circuit to be in a charging phase continuously or in a normal operation mode. In a case that the output voltage is higher than an upper threshold voltage, the boost circuit is continuously in the charging phase and does not supply power to an output load, and an output capacitor is discharged to supply power to the output load. In a case that the output voltage is lower than a lower threshold voltage, the boost circuit is in the normal operation mode.

Growing community of inventors

Shanghai, China

Haijun Zhang