Beken Corporation

Beken Corp Shenzhen

Donghui Gao

Jiazhou Liu

Dawei Guo

Desheng Hu

Weifeng Wang

Lianxue Liu

A bias circuit includes a digital-to-analog converter configured to receive a digital input and output an analog signal; an integrator coupled to a first node that is coupled to the digital-to-analog converter and an amplifier, and coupled to a second node that is coupled to a positive input port of a first comparator and a negative input port of a second comparator; the digital signal processor coupled to an output port of the first comparator and an output port of the second comparator, and coupled to an input port of the digital-to-analog converter.

Signal processing bias circuit for microphone

A power amplifier includes a digital-to-analog converter, a loop filter, a driver circuit, a first adjustable reference resistor and a second adjustable reference resistor. A circuit includes an overcurrent protection circuit and a power amplifier, wherein the overcurrent protection circuit is communicatively coupled to the power amplifier. The digital-to-analog converter is configured to receive a digital signal and to output an analog signal, the driver circuit communicatively coupled to the loop filter and at least one of a first output port and a second output port of the power amplifier.

Power amplifier and overcurrent protection circuit

A method and a system of calibrating a DC offset voltage on a resistor load are provided. The system may include a first operational amplifier, a second operational amplifier, a comparator, a digital signal processor, and a digital to analog convertor. At a calibration mode, under control of the digital signal processor, the system may utilize open-loop high gain characteristics of the first operational amplifier and the comparator to automatically detect and calibrate the DC offset voltage. At an operation mode, the system may automatically compensate the DC offset voltage based on the calibration of the DC offset voltage. In this way, the system and the method can automatically detect, calibrate, and compensate the DC offset voltage with reduced cost and technical complexity.

Calibration of audio power amplifier DC offset

A power amplifier includes an operational amplifier, a ramp generator communicatively coupled to both a first comparator and a second comparator; the first comparator further communicatively coupled to a negative output port of the operational amplifier; the second comparator further communicatively coupled to a positive output port of the operational amplifier; a first inverter communicatively coupled to the first comparator; a second inverter communicatively coupled to the second comparator; wherein the first inverter is communicatively coupled to both a positive input port of the operational amplifier via a first resistor and coupled to a negative input port of the operational amplifier via a fourth resistor; and the second inverter is communicatively coupled to both the positive input port of the operational amplifier via a second resistor and connected to the negative input port of the operational amplifier via a third resistor.

Power amplifier and method of operating the power amplifier

A switch for controlling a gain of an amplifier comprises a first NMOS transistor, a second NMOS transistor, a third PMOS transistor, a fourth NMOS transistor, a fifth PMOS transistor, a first resistor, and an inverter. A source of the first NMOS transistor is connected to a first terminal of the first resistor, a drain of the first NMOS transistor is connected to a drain of the third PMOS transistor, a source of the fourth NMOS transistor and a source of the second NMOS transistor, a gate of the first NMOS transistor is connected to a source of the third PMOS transistor, a drain of the fifth PMOS transistor, a drain of the fourth NMOS transistor, and a gate of the second NMOS transistor; a gate of the third PMOS transistor receives a switch voltage (Vs); a gate of the fourth PMOS transistor receives a negative switch voltage (Vsn).

Switch for controlling a gain of an amplifier and method thereof

A method for suppressing POP noise in an audio operation amplifier, comprising: connecting a first resistor and a second resistor in series at an output stage of the audio operation amplifier by turning on a first switch and a second switch; generating, with a ramp generator, a ramp voltage after an audio signal is input into the audio operation amplifier, wherein the ramp voltage varies from zero to a first value; generating, with an voltage generator, a second voltage, wherein a third switch is turned on and a fourth switch is turned off when the ramp voltage reaches the second value; short-circuiting the first and second resistors by turning off the first and second switches; and outputting, with the audio operation amplifier, an amplified audio signal.

Method and circuit for suppressing pop noise in an audio operation amplifier

A method of error decision, comprising: for each of a plurality of demodulated decision information in a codeword, identifying by a controller, a decoded bit for the demodulated decision as an erasable error bit if the demodulated decision information is larger than a first threshold and smaller than a second threshold; for all the identified erasable error bits, enumerating by a calculator, all possible combinations of the identified erasable error bits; for each combination of all enumerated possible combinations feeding by the calculator, each combination with all other decided decoded bits of the code word into a header correction checker; performing, by the header correction checker, header correction checking for each combination; and outputting, by a decision circuit connected to the header correction checker, a combination with a correct header correction check (HEC) result as an output sequence.

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Shanghai, China

Donghui Gao