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1. 发明公开

US20230291361A1 High-Speed Transimpedance Amplifier with Bandwidth Extension Feature over Full Temperature Range and Bandwidth Extension Method 审中-公开
公开(公告)号：US20230291361A1
公开(公告)日：2023-09-14
申请号：US18041203
申请日：2021-12-24
申请人： XIAMEN EOCHIP SEMICONDUCTOR CO., LTD
发明人： Zhicong LUO , Jinghu LI , Riqing CHEN , Haofan DING , Xin HONG , Jianhai YU , Hanghui TU
IPC分类号： H03F1/30 , H03F1/42 , H03F3/45
CPC分类号： H03F1/301 , H03F1/42 , H03F3/45179 , H03F2200/36 , H03F2200/447
摘要： A high-speed transimpedance amplifier with bandwidth extension feature over full temperature range and bandwidth extension method belong to the field of integrated circuit. The present invention solves the problem existed in boosting core amplifier bandwidth technology over full temperature range. The present invention includes a preamplifier TIA, a phase splitting stage PS, a pre-driver stage Pre-Drive, an output buffer BUFF and an offset cancelation circuit OC. The preamplifier TIA adopts the gate-drain voltage cancelation technology to expand the bandwidth, so that its −3 dB bandwidth is greater than twice the closed-loop bandwidth of the first-order TIA. The pre-driver stage Pre-Drive is used to drive the output buffer BUFF. By adjusting the source-level negative feedback capacitance value of the pre-driver stage Pre-Drive circuit to generate a high-frequency gain that varies with temperature, the preamplifier TIA bandwidth differences under different temperature conditions are compensated.

2. 发明申请

US20220399941A1 High-speed Optical Transceiver Integrated Chip Drive Circuit with Phase Delay Compensation Function 有权
公开(公告)号：US20220399941A1
公开(公告)日：2022-12-15
申请号：US17621209
申请日：2021-01-22
申请人： XIAMEN EOCHIP SEMICONDUCTOR CO., LTD
发明人： Zhicong LUO , Jinghu LI , Zhang FAN , Fujie CHEN , Qipeng LIN , An LIN , Jianhai YU , Hanghui TU
IPC分类号： H04B10/40 , H04B10/50 , H04B10/548 , H04B1/12 , H04L25/03
摘要： A high-speed optical transceiver integrated chip drive circuit with phase delay compensation function includes a transmitting end drive circuit to drive the laser to emit light to transmit signals and a receiving end drive circuit to optimize the signal degradation caused by the signal sent by the transmitting end drive circuit to the laser via the transmission backplane; a long code phase lead adjustment circuit is arranged on the main channel of the transmitting end drive circuit, and a long code phase lag adjustment circuit is set on the main channel of the receiving end drive circuit. The present invention is used to optimize high-speed signals and solve the problem that the CML drive circuit at the receiving end or the laser drive circuit at the transmitting end cannot compensate the difference between the group delay and phase delay for the high-speed signal after passing through the backplane (Laser device).

3. 发明申请

US20220360042A1 DC-coupled Laser Diode Driver Circuit with Large Modulation Current 有权
公开(公告)号：US20220360042A1
公开(公告)日：2022-11-10
申请号：US17621421
申请日：2021-06-18
申请人： XIAMEN EOCHIP SEMICONDUCTOR CO., LTD
发明人： Jinghu LI , Zhicong LUO , Hanghui TU
IPC分类号： H01S5/042
摘要： A DC-coupled laser driver circuit with large modulation current belongs to the optical field. The present invention solves the problem that the conventional laser driver circuit consumes too much voltage margin because the transistor is used as the tail current source, resulting in a small modulation current. The present invention includes a negative feedback unit, an adaptive drive unit, a mirrored tail current source, a resistor R11, a resistor R12, a bias current source IBIAS and a diode D2; The resistor R12, laser D1, resistor R11, and bias current source IBIAS are connected in series between the voltage VCC and the ground in sequence; the input terminal of the negative feedback unit is connected to the data signal input ports TINP and TINN, the output terminal of the negative feedback unit is connected to the input terminal of the adaptive drive unit, the output terminal of the adaptive drive unit is connected to the control signal input terminal of the mirrored tail current source, a drive signal output terminal of the mirrored tail current source is connected to the anode of the laser D1 through a diode D2, the other drive signal output terminal of the mirrored tail current source is connected to the cathode of the laser D1.

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