TY - JOUR
T1 - Emitter-induced gain effects on dual-emitter phototransistor as an electrooptical switch
AU - Chen, Wei Tien
AU - Chen, Hon Rung
AU - Chiu, Shao Yen
AU - Hsu, Meng Kai
AU - Liu, Wen Chau
AU - Lour, Wen Shiung
N1 - Funding Information:
Manuscript received March 15, 2007; revised June 7, 2007. This work was supported in part by the National Science Council under Contracts NSC 95-2221-E-019-059-my3 and NSC 95-2221-E-390-027. The review of this paper was arranged by Editor L. Lunardi. W.-T. Chen, S.-Y. Chiu, M.-K. Hsu, and W.-S. Lour are with the Department of Electrical Engineering, National Taiwan-Ocean University, Keelung 20224, Taiwan, R.O.C. (e-mail: [email protected]). H.-R. Chen is with the Department of Electrical Engineering, National University of Kaohsiung, Kaohsiung 824, Taiwan, R.O.C. W.-C. Liu is with the Institute of Microelectronics, Department of Electrical Engineering, National Cheng-Kung University, Tainan 701, Taiwan, R.O.C. Digital Object Identifier 10.1109/TED.2007.902667
PY - 2007/9
Y1 - 2007/9
N2 - In this paper, an investigation of the static/dynamic performance of dual-emitter phototransistors (DEPTs) as an electrooptical switch was made. In the static case, the measured optical gains (the collector photocurrents) of DEPTs operated at a 12.5-μW optical power have been enhanced from 13.7 to 20.2 (88 to 129 μA) due to an emitter-induced gain high (EIGH) from photocurrent modulation. For DEPTs as an electrooptical switch, the EIGH from photocurrent modulation and the emitter-induced gain effect from junction-voltage modulation dominate the dynamic operation. In the case of continuous light input, good bistable-state output characteristics can be realized with an electrical clock signal. When the switch is operated with a 2-V supply voltage and a 10-kOmega load resistance, the stable electrical-logic swing (ELS) is 0.41 V for a 1-V/1-kHz clock signal. Electrical inputs of 5-, 10-, and 50-kHz clock signals are also employed to achieve outputs with increased ELSs of 1.18, 1.19, and 1.3 V, respectively. An optical inverter is realized. When two clock signals, an electrical input and an optical input, are employed, DEPTs are operated as a tristable-state switch.
AB - In this paper, an investigation of the static/dynamic performance of dual-emitter phototransistors (DEPTs) as an electrooptical switch was made. In the static case, the measured optical gains (the collector photocurrents) of DEPTs operated at a 12.5-μW optical power have been enhanced from 13.7 to 20.2 (88 to 129 μA) due to an emitter-induced gain high (EIGH) from photocurrent modulation. For DEPTs as an electrooptical switch, the EIGH from photocurrent modulation and the emitter-induced gain effect from junction-voltage modulation dominate the dynamic operation. In the case of continuous light input, good bistable-state output characteristics can be realized with an electrical clock signal. When the switch is operated with a 2-V supply voltage and a 10-kOmega load resistance, the stable electrical-logic swing (ELS) is 0.41 V for a 1-V/1-kHz clock signal. Electrical inputs of 5-, 10-, and 50-kHz clock signals are also employed to achieve outputs with increased ELSs of 1.18, 1.19, and 1.3 V, respectively. An optical inverter is realized. When two clock signals, an electrical input and an optical input, are employed, DEPTs are operated as a tristable-state switch.
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U2 - 10.1109/TED.2007.902667
DO - 10.1109/TED.2007.902667
M3 - Article
AN - SCOPUS:41749104891
SN - 0018-9383
VL - 54
SP - 2411
EP - 2417
JO - IEEE Transactions on Electron Devices
JF - IEEE Transactions on Electron Devices
IS - 9
ER -