Liangqiong Shi

Jinghu Li

Zhang Fan

Hanghui Tu

Weitan Yao

Weiyin Zheng

Fujie Chen

Yuanyuan Zhou

A high-speed TIA anti-5G WIFI electromagnetic interference method includes the steps of: stacking a high-voltage capacitor Cand a resistor Rfor constructing a filter circuit on a bare DIE chip of TIA; splitting Cinto two parallel filter capacitors Cand C, which satisfy C=C+C, C=C; constructing differential output to cancel signal interference; constructing electromagnetic interference that cancels out lens leakage by stacking avalanche photodiode APD, Cand gold-plated pad on the vertical axis close to the bare DIE chip, and connecting to the pads through gold wires; stacking Rand Con the vertical axis between pins VDD and VAPD, connecting Rto Cthrough gold wire No. 1, connecting Cto pin VAPD through gold wire No. 2, the gold wire No. 1 and the gold wire No. 2 form a 90° angle to offset the electromagnetic interference leaked by the lens.

High-speed TIA anti-5G WIFI electromagnetic interference method

A DFB laser DC-coupled output power configuration scheme with adjustable voltage difference. utilizes an external or internal power configuration unit to provide two electric DC power supplies with a fixed voltage difference for the transmitting unit TX of the DFB laser and the optical transceiver integrated chip, and at the same time optimizes the transmitting unit TX. The optimization scheme is that: the transistors in the transmitting unit TX are all low-voltage high-speed tubes, the transmitting unit TX includes a negative capacitance structure composed of capacitors Cand C, serving as an auxiliary structure for improving bandwidth. After optimization, the minimum voltage of the power supply voltage port TVCC of the transmitting unit TX is 2.7V and the problems that the output eye diagram is severely cracked and cannot be used when the traditional DFB laser configuration scheme with an external 3.3V power supply is tested at high temperature are solved.

DFB laser DC-coupled output power configuration scheme with adjustable voltage difference

A DFB laser DC-coupled output power configuration scheme belongs to the field of laser drivers in optical communication integrated circuits. The present invention solves the existing problems in the conventional DFB laser power supply configuration scheme. The power configuration scheme of the present invention utilizes an external or internal power configuration unit to provide two electric DC power supplies with a fixed voltage difference for the transmitting unit TX of the DFB laser and the optical transceiver integrated chip, and at the same time optimizes the transmitting unit TX. The optimization scheme is that: the transistors in the transmitting unit TX are all low-voltage high-speed tubes, the transmitting unit TX includes a negative capacitance structure composed of capacitors Cand C, serving as an auxiliary structure for improving bandwidth. After optimization, the minimum voltage of the power supply voltage port TVCC of the transmitting unit TX is 2.7V.

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Xiamen, China

Liangqiong Shi