Title :
Some analog building blocks for TFT circuits
Author :
Itou, Rui ; Kayama, Masanori ; Shima, Takeshi
Author_Institution :
Dept. of Electr. Eng., Kanagawa Univ., Yokohama, Japan
Abstract :
The analog circuits fabricated by the amorphous and/or polycrystalline silicon TFT suffer from very wide deviation effects of the threshold voltage Vth and the current gain β. This paper proposes some analog building blocks for TFT circuits, in which the techniques to reduce the effects caused by the threshold voltage and the current gain β mismatch of the transistors are used. First, Vth and β deviation-free differential amplifier is discussed. Second, Vth deviation-free current source is proposed. Finally, Vth and β deviation-free class A amplifier is presented. The test chip to verify the proposed idea has been simulated and designed using VDEC design environment
Keywords :
MOS analogue integrated circuits; circuit CAD; constant current sources; differential amplifiers; integrated circuit design; thin film transistors; Si; TFT circuits; VDEC design environment; analog building blocks; class A amplifier; current gain; deviation effects; deviation-free current source; deviation-free differential amplifier; gain mismatch; threshold voltage; Calibration; Capacitors; Differential amplifiers; Diodes; Equations; Monitoring; Switches; Switching circuits; Thin film transistors; Threshold voltage;
Conference_Titel :
Circuits and Systems, 2001. MWSCAS 2001. Proceedings of the 44th IEEE 2001 Midwest Symposium on
Conference_Location :
Dayton, OH
Print_ISBN :
0-7803-7150-X
DOI :
10.1109/MWSCAS.2001.986201
