Title :
The OP-amplifier with offset cancellation circuit
Author :
Lim, Kyu-Tae ; Kim, Seong-Joong ; Kwon, Oh-Kyong
Author_Institution :
Div. of Electr. & Comput. Eng., Hanyang Univ., Seoul, South Korea
Abstract :
For the data drivers of TFT-LCDs with high gray-scale above 8-bit, OP-Amps with high voltage accuracy less than 1 mV, is needed. Accordingly, the offsets voltages of the OP-Amps should be compensated in order to achieve the accuracy. In this paper, we present an asymmetrical differential input circuit with common mode feedback (CMFB) circuit, which reduces the offsets. The OP-Amp with the proposed circuit shows the systematic offset voltages less than 100 μV in whole operating ranges. Furthermore, the random offsets also can be compensated by the proposed circuit.
Keywords :
circuit feedback; differential amplifiers; driver circuits; liquid crystal displays; operational amplifiers; thin film transistors; OP-amplifier; TFT-LCD; asymmetrical differential input circuit; common mode feedback; data drivers; offset cancellation circuit; systematic offset voltages; Driver circuits; Feedback circuits; Gray-scale; Operational amplifiers; Output feedback; Switches; Switching circuits; Tail; Thin film transistors; Voltage;
Conference_Titel :
Electron Devices and Solid-State Circuits, 2003 IEEE Conference on
Print_ISBN :
0-7803-7749-4
DOI :
10.1109/EDSSC.2003.1283569
