一款具有快速上升时间的可均衡激光发射机

王悦; 杨涛; 祁楠; 石泾波; 陈铖颖

doi:10.19304/J.ISSN1000-7180.2021.1107

一款具有快速上升时间的可均衡激光发射机

doi: 10.19304/J.ISSN1000-7180.2021.1107

王悦¹,
杨涛²,
祁楠³,
石泾波^4, ,,
陈铖颖^1, ,

基金项目:

国家重点研发计划 44-01

国家自然科学基金 61704143

厦门市青年创新基金 3502Z20206074

详细信息

作者简介:
王悦女，(1996-)，硕士研究生.研究方向为高速模拟集成电路设计

通讯作者:
石泾波(通讯作者) 男，(1982-)，博士，副研究员.研究方向为面向光互连/光通信的高速集成电路设计、低功耗高集成度的光学传感芯片的设计.E-mail: jingboshi@pku.edu.cn

陈铖颖(通讯作者) 男，(1982-)，博士，副教授.研究方向为混合信号集成电路设计. E-mail: chenchengying@xmut.edu.cn

中图分类号: TN432
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- 文章访问数: 11
- HTML全文浏览量: 10
- PDF下载量: 5
- 被引次数: 0
出版历程
- 收稿日期: 2021-09-19
- 修回日期: 2021-10-19
- 网络出版日期: 2022-05-12

A transmitter with fast rise time and equalization

WANG Yue¹,
YANG Tao²,
QI Nan³,
SHI Jingbo^{4
, ,},
CHEN Chengying^{1
, ,}

摘要

摘要:
面向直接飞行时间测量的3D图像传感器应用，设计了一种具有快速上升/下降时间，输出电流脉冲可配置的阵列型VCSEL(Vertical Cavity Surface Emitting Laser)激光发射机.输出级采用直流耦合驱动电路结构，无需额外的偏置电压和分立元件；4 bit可编程均衡脉冲电路实现了不同高度或宽度的均衡电流，改善了激光驱动器输出电流的上升时间，提高了脉冲信号的完整性和飞行时间的计算精度；同时采用4 bit电流型数模转换器控制不同的输出电流，以实现不同的输出光功率；脉冲产生电路由多个延时单元、选择器和触发器构成，输出不同宽度的脉冲信号，实现了不同大小的平均电流.该电路基于CMOS 65nm工艺实现，电源电压为3.3V，后仿结果表明此发射机可以输出100~500 mA电流，在10 MHz脉冲频率时，脉冲信号实现1.09~17.38 ns可调，其上升时间为270 ps，下降时间为90 ps.均衡电路脉冲信号实现220ps~3.48ns可调，输出级最大输出电流的平均功率为0.15 W.
- 直接飞行时间 /
- 激光发射机 /
- 均衡脉冲电路 /
- 电流型数模转换器
Abstract:
For the application of 3D image sensor, a transmitter with fast rise/fall time and configurable output current pulse is proposed for array VCSEL (Vertical Cavity Surface Emitting Laser). Without extra bias voltage and discrete components, the output stage is DC coupled. A 4bit programmable equalization circuit implements a different pulse height or width of the equalizing current, improving the rise time of the current, the integrity of the signal and accuracy of the time of flight; a 4bit current digital-to-analog converter controls output currents to achieve different output optical power. The pulse generator is composed of delay units, selectors and triggers, outputting pulse signals of different widths, realizing different average current. The transmitter is realized with CMOS 65 nm process, and the power supply voltage is 3.3 V. The post-simulation results show that the output current can reach 100~500 mA. When the pulse frequency is 10 MHz, the pulse signal is adjustable from 1.09 to 17.38 ns whose rise time is 270 ps and fall time is 90 ps. The pulse signal of the equalization circuit can be adjusted from 220ps~3.48ns, and the average power of the maximum output current is 0.15W.
- Time-of-fly /
- Laser diode driver /
- Equalizing pulse circuit /
- Current digital-to-analog converter

HTML全文

图 1 激光器阵列发射机整体结构框图

Figure 1. Laser array transmitter Block diagram

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图 2 电感两端电压变化曲线

Figure 2. The voltage across the inductor variation curve

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图 3 脉冲产生电路图

Figure 3. Pulse generation circuit diagram

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图 4 触发器原理图

Figure 4. Trigger schematic

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图 5 电流型数模转换器原理图

Figure 5. IDAC schematic

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图 6 IDAC输出电流变化曲线

Figure 6. IDAC output current change curve

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图 7 时间误差原理图

Figure 7. Time error schematics

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图 8 均衡脉冲电路原理图

Figure 8. Equalizing pulse circuit schematic

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图 9 发射机版图

Figure 9. The layout of the transmitter

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图 10 VB未接电容输出电流与输出节点电压曲线

Figure 10. VB unconnected capacitor output current and output node voltage curve

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图 11 VB接电容输出电流与输出节点电压曲线

Figure 11. VB connected capacitor output current and output node voltage curve

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图 12 均衡电流曲线

Figure 12. Equalizing current curve

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图 13 不同工艺角下脉宽变化图

Figure 13. Different process angle pulse width graph

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图 14 脉宽变化图

Figure 14. Pulse width change graph

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图 15 均衡脉变化图

Figure 15. Equalizing pulse change graph

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表 1 发射机性能对比表

Table 1. Transmitter performance comparison table

参考文献	[9]	[10]	[11]	[12]	本文
工艺(μm)	0.35	0.16	0.18	0.18	0.065
耦合方式	AC	AC	DC	/	DC
电源电压(V)	50	/	3.3	5	3.3
输出电流(A)	2	20	/	5	0.5
电流上升时间(ns)	/	0.58	1.5	0.9	0.2
脉冲宽度(ns)	0.1	0.85	5	5	1-15
脉冲频率(MHz)	0.5	0.4	100	2.5	10
均衡电流(mA)	/	/	/	/	0.1
平均功率(W)	/	/	0.92	/	0.15

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参考文献(12)

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