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Special Multiple Analog Channel Design for the Liquid Optical Phase Array Driven

Author: ChengYunXiao
Tutor: ZhangJian
School: Harbin Institute of Technology
Course: Instrument Science and Technology
Keywords: CMOS integrated analog switch liquid crystal optical phased array beam steering
CLC: TN873.93
Type: Master's thesis
Year: 2008
Downloads: 23
Quote: 0
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Abstract


Beam steering, deflecting and controlling is one of the front-edge technologies, which has very important applications such as free-space optical communication, APT technology, optoelectronic countermeasure, optical interlink and so on. Optical phased array based accurate beam steering is an all electrical controlled non-mechanical scanning and tracking technology with such advantages as electrical addressing, no mechanism wearing, high control precision, low power consumption, small size and weight and high payload, which is regarded as a new important field in science and technology developed countries.Liquid crystal optical phased array is a novel device, with the same driving mechanism as liquid crystal display, the controlled patterned voltages forced on the liquid crystal layer makes the effective refractive index change of liquid crystal with a birefringence characteristics, results in liquid crystal molecule refractive index changes, and then we can control the beam deflection direction.The driving voltage of liquid crystal optical phased array is bipolar analog pulse voltage, and changes in voltage direct impact on the liquid crystal phase modulation. As the optical array is high-density array structure, so hundreds or thousands of control electrodes are needed, each control electrode needs for a drive voltage by analog switch, so a high-density multi-channel analog switch is a necessary electronic device in the drive circuit of liquid optical array. But there are only low integration analog switches, mostly 4 to 8 rails, in current market, which doesn’t fit the requirements of the integrated analog switches. And so we need to design and process a dedicated, high-density integrated analog switch. This paper aims to design an analog integrated switch for driving liquid optical array. This analog switch is designed to SPDT structures, and it makes use of external control port choose one of the two-rail analog voltages, it can also achieve programmable control of the analog voltage duty cycle loaded on the liquid crystal electrode. In the design of analog switches, we focus on CMOS transmission gate structure which make up the analog channel, consider the liquid crystal electrodes requirements of the analog switch-resistance, calculate the appropriate ratio of the width with the length of MOS, optimize design as far as possible, and achieve the minimum cost. In the end, all the design parameters have passed circuit simulation by Hspice, the layout of the analog switches circuits were drawn by Cadence EDA Tools Virtuoso, compare the schematic with layout, and the Extraction of the parameters pass through the post-simulation. The results show the designed analog switch meets the parameters of driving liquid crystal array. Finally, the designed analog switch chip consists of 56-pin, 26 analog output terminals, 26 control terminals, one normal-open and one normal-closed terminal, together with the power and ground. The package size is of 16 mm×22mm, and wafer efficiency has greatly improved compared with MAX4533.

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