Realtek Semiconductor Inc.

Po-Chiang Wu

Sheng-Nan Chiu

Shu-Yeh Chiu

Chung-Ting Yang

Sen-Huang Tang

Chia-Liang Chiang

Ying-Chuan Peng

Ching-Hsian Liao

A bidirectional data transmission system and the transmitting method thereof are disclosed. A video graphics array interface or an interface including a display data channel is utilized in the bidirectional data transmission to transmit data in bi-direction.

Bi-directional data transmission system and method

An audio processing chip includes a connecting port, an audio amplifier module and a pulse width modulation (PWM) control circuit. The connecting port receives a pulse width modulation (PWM) signal; the audio amplifier module amplifies an audio signal according to a control signal to thereby output an audio output signal; and the pulse width modulation (PWM) control circuit is coupled between the connecting port and the audio amplifier module, and outputs the control signal to the audio amplifier module according to the PWM signal to thereby control an operation of the audio amplifier module.

Audio processing chip and audio signal processing method thereof

A gain adjustment device and a method thereof are provided. The device includes a first processing module, a gain adjustment circuit, a second processing module, and a gain control module. The first processing module receives an input signal and generates a first signal. An operating voltage of the first processing module is a first voltage. The gain adjustment circuit receives the first signal and adjusts a gain of the first signal according to a gain control signal to output a third signal. The second processing module receives the third signal and generates a second signal. An operating voltage of the second processing module is a second voltage. The gain control module generates the gain control signal according to the first voltage and the second voltage.

Gain adjustment device and method thereof

The signal generating apparatus includes a signal modulating unit, a selection signal generating unit, and a phase adjusting unit. The signal modulating unit is utilized for processing a modulation upon an input signal to generate a modulated signal. The selection signal generating unit is utilized for generating at least a first selection signal. The phase adjusting unit is coupled to the signal modulating unit and the selection signal generating unit, and is utilized for receiving the modulated signal and adjusting a pulse width of the modulated signal to generate an output signal according to the first selection signal.

Signal generating apparatus and related method

A test circuit, for checking whether at least one programmable gain amplifier (PGA) operates correctly, includes a signal generator, a gain controller, a test level output circuit, a comparison circuit and an identifying circuit. The signal generator is utilized for outputting a test input signal to a PGA to generate a test output signal. The gain controller is utilized for outputting a gain control signal to the PGA to adjust a gain of the PGA. The test level output circuit is utilized for referring to the test output signal to output a first test level and a second test level. The comparison circuit is utilized for comparing the first and second test levels to generate a result signal. The identifying circuit is utilized for identifying whether the PGA operates correctly according to the result signal.

Test circuit for programmable gain amplifier

A controller of a power amplifier includes an oversampler for oversampling an incoming digital signal to generate an oversampled signal, a controlling module for generating a first control signal and a second control signal according to the oversampled signal, a PWM circuit for generating a first PWM signal according to the first control signal, and a pulse width adjuster for adjusting a pulse width of the first PWM signal according to the second control signal to generate a second PWM signal for controlling a power stage of the power amplifier.

Growing community of inventors

Hsinchu County, Taiwan

Po-Chiang Wu