Integrated Device Technology, Inc.

Xiamen Fourier Electronics Co., Ltd.

Montage Electronics (shanghai) Co., Ltd.

Montage Technology Inc.

Shanghai Foursemi Semiconductor Co., Ltd.

Xuexin Ding

Lin Zhang

Jian Xu

Zhongyuan Chang

Hongquan Wang

Fangkang Shen

Weiji Liu

Xiaolei Liu

Yingshun Jiang

Liang Zhang

Gang Yan

Lixin Jiang

Yanbo Wang

YuFei Gu

Zongjie Hu

Jiandong Jiang

Weifeng Zhang

Li Quan

A zero-crossing detection circuit includes a variable resistor, a first switch, a first capacitor, a first selector, a second selector, a first transistor, and a comparator. Variable resistor is connected to power supply voltage via reference resistor. First switch has first terminal coupled to first terminal of variable resistor. First capacitor has first terminal coupled to second terminal of first switch. First selector makes second terminal of first capacitor receive switching voltage or reference ground voltage according to first control signal. First transistor has first terminal coupled to second terminal of variable resistor. Second terminal of first transistor receives reference ground voltage. Second selector couples control terminal of first transistor to first terminal of first transistor or to first terminal of first capacitor according to first control signal. Comparator compares voltage on second terminal of variable resistor with reference voltage to generate final zero-crossing detection output signal.

Zero-crossing detection circuit

The disclosure provides a glitch removal circuit with low latency. The glitch removal circuit includes a first signal edge detector, a second signal edge detector, a latch, and a control signal generator. The first signal edge detector is activated according to the first control signal to detect the rising edge of the input signal to generate the first detection result. The second signal edge detector is activated according to the second control signal to detect the falling edge of the input signal to generate the second detection result. The latch sets the generated output signal according to the first detection result, and clears the generated output signal according to the second detection result. The control signal generator shields the glitch on the input signal to generate a processed signal, and generates a first control signal and a second control signal according to the processed signal.

Glitch removal circuit

A temperature detecting and controlling integration device for the micro speaker is provided. After the filter receives an input signal, the power amplifier adjusts the power amplification, and the multi-frequency detection signal is generated with the waveform generator. The extracted signal is generated to drive the micro speaker to emit a sound signal. Afterwards, the voltage signals are extracted at two ends of the coil and the temperature signal is obtained by converting, capturing, and integrating to pass the temperature value to the external device, and the temperature value of the non-linear temperature-controlling unit is analyzed to adjust the compensation gain in real time. The smoothly control of speaker temperature and stable playback of the sound signals is played that can be achieved.

Temperature detecting and controlling integration device and the temperature controlling method applied for micro speaker

A voltage-mode line driving circuit is provided. The voltage-mode line driving circuit includes a driving circuit, the driving circuit receiving, as an input signal, a feedback signal, and outputting an output signal. The voltage-mode line driving signal also includes an adaptive tuning circuit coupled to the driving circuit, the adaptive tuning circuit receiving as input signals the feedback signal and the output signal and adaptively outputting a modifying signal to the driving circuit which modifies the feedback signal.

Voltage-mode line driving circuit having adaptive impedance matching

The methods and systems presented herein provide an improved means of correcting the variation of Voltage Output Differential (VOD) in differential drivers. In some embodiments, a high-precision reference voltage is generated not only based on a desired VOD, but also by monitoring the Voltage Common Mode (VCM) in a differential driver. In some embodiments, the VOD is then compared with the high-precision reference voltage to correct the output current. The result is a low-variation output voltage.

Low variation voltage output differential for differential drivers

An input termination circuit includes a first and a second resistor each having a terminal respectively coupled to a first and a second input terminal of the input termination circuit, a first and a second transistor coupled in series between the first resistor and the second resistor, and a third transistor having two terminals respectively coupled to the control circuit and a node between the first and the second transistor. The gate of the third transistor is coupled to ground. The gates of the first and the second transistor are coupled to a control circuit that is adapted to provide a control signal to turn the first and the second transistor on or off.

Input termination circuitry with high impedance at power off

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Xuexin Ding