Low-frequency noise properties of dynamic-threshold (DT) MOSFET's |
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Authors: | Tsun-Lai Hsu Denny Duan-Lee Tang Jeng Gong |
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Institution: | Ind. Technol. Res. Inst., Electron. Res. & Service Organ., Hsinchu; |
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Abstract: | This paper shows that MOSFET operated in dynamic-threshold (DT) mode (Vbody=Vgate) is more suitable for low-noise RF/analog applications than those operated in conventional mode (Vbody=Vsource). Detailed low-frequency noise properties of these two modes of device operation were compared for 0.31-μm gate MOSFET's, in which NMOS's are surface-channel devices (S.C.) and PMOS's are buried-channel (B.C.) devices. Experimental data show that when the devices are biased at same transconductance, the low-frequency noise in DT mode is 30 times lower (at gm=2.2×10-3 S) than that in the conventional mode for the B.C. devices and ten times (at gm=2.0×10 -3 S) lower for the S.C. devices |
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