Title :
High-Temperature Operation of AlGaN/GaN HEMTs Direct-Coupled FET Logic (DCFL) Integrated Circuits
Author :
Cai, Yong ; Cheng, Zhiqun ; Yang, Zhenchuan ; Tang, Chak Wah ; Lau, Kei May ; Chen, Kevin J.
Author_Institution :
Dept. of Electron. & Comput. Eng., Hong Kong Univ. of Sci. & Technol., Kowloon
fDate :
5/1/2007 12:00:00 AM
Abstract :
This letter presents the high-temperature performance of AlGaN/GaN HEMT direct-coupled FET logic (DCFL) integrated circuits. At 375 degC, enhancement-mode (E-mode) AlGaN/GaN HEMTs which are used as drivers in DCFL circuits exhibit proper E-mode operation with a threshold voltage (VTH) of 0.24 V and a peak current density of 56 mA/mm. The monolithically integrated E/D-mode AlGaN/GaN HEMTs DCFL circuits deliver stable operations at 375 degC: An E/D-HEMT inverter with a drive/load ratio of 10 exhibits 0.1 V for logic-low noise margin (NML) and 0.3 V for logic-high-noise margin (NMH) at a supply voltage (VDD) of 3.0 V; a 17-stage ring oscillator exhibits a maximum oscillation frequency of 66 MHz, corresponding to a minimum propagation delay ( taupd) of 446 ps/stage at VDD of 3.0 V
Keywords :
HEMT integrated circuits; III-V semiconductors; aluminium compounds; field effect transistors; gallium compounds; invertors; logic circuits; oscillators; wide band gap semiconductors; 0.1 V; 0.24 V; 0.3 V; 3.0 V; 375 C; 66 MHz; AlGaN-GaN; E/D-HEMT inverter; direct-coupled FET logic integrated circuits; logic-high-noise margin; logic-low noise margin; monolithically integrated E/D-mode circuits; oscillation frequency; stage ring oscillator; supply voltage; threshold voltage; Aluminum gallium nitride; Current density; Driver circuits; FET integrated circuits; Gallium nitride; HEMTs; Inverters; Logic circuits; MODFETs; Threshold voltage; $hbox{CF}_{4}$ plasma treatment; AlGaN/GaN; IC; direct-coupled FET logic (DCFL); enhancement mode (E-mode); high electron mobility transistor (HEMT); high-temperature electronics; threshold voltage;
Journal_Title :
Electron Device Letters, IEEE
DOI :
10.1109/LED.2007.895391
