A Chopper Rail-to-Rail Operational Amplifier Design for LCD

• Main Authors: KAN, LI-WEI, 甘禮維
• Other Authors: LIN, KUO-JEN
• Format: Others
• Language: zh-TW
• Published: 2017
• Online Access: http://ndltd.ncl.edu.tw/handle/45256470828983801841

碩士 === 中華大學 === 電機工程學系 === 105 === This article describes the offsetting method for the output offset voltage of the opamp, and uses the flip-flop concept of the chopper as a circuit design to achieve the most efficient design to reduce the output offset voltage. In the traditional drive amplifier for liquid crystal display, it is desirable to have a better circuit design to overcome the drift of the output voltage level to avoid the discontinuity of the gray-scale output voltage, so the general designers are using switched capacitors to eliminate the output offset voltage, which results in an increase in the layout area, a decrease in the output potential settling time, and an increase in the output amplifier rise and fall time delays. In recent years, the design trend has been the use of the concept of the chopper skill for today's liquid crystal display drive amplifier, will only increase the number of a small number of transistors, while offset voltage to achieve the function, will not make a substantial increase in layout area, does not affect the output potential rise and fall time, nor cause the control signal is too complicated to deal with, this approach a lot of benefits, it is suitable for liquid crystal display.