Apexone Microelectronics Ltd.

Yongqing Ren

Qingjiang Ma

Hao Zhu

Haibin Huang

James Y Gao

A system () for clock signal synchronization includes a data analyzer () and a synchronized clock signal generator () coupled to an RC oscillator (). The data analyzer () generates a digital control signal representing the number of cycles of a reference signal of the RC oscillator () during an eight-bit period of an incoming token packet. The synchronized signal clock generator () uses the digital control signal to lock a clock signal to packets that have the same bit rate as the token packet.

System and method for clock signal synchronization

A class-D amplifier () includes a logic circuit () for controlling the operation of a switching bridge (). The logic circuit () transmits the differential mode of a differential pulse width modulation input signal and deletes a central portion of the common mode of input signal, while preserving pulses of a minimum pulse width following a rising edge and preceding a falling edge in common mode of the input signal. Deleting the central portion of the common mode signal improves the efficiency and reduces the electromagnetic interference radiation of the class-D amplifier (). Preserving the pulses of the minimum pulse width ensures the proper operation of the switching elements () in the switching bridge (), thereby reducing the distortion in the signal amplification.

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Shanghai, China

Yongqing Ren