Widely tunable low-power high-linearity current-mode integrator built using DG-MOSFETs
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A novel tunable current-mode integrator for low-voltage low-power applications is presented using mixed-mode TCAD simulations. The design is based on independently driven double-gate (IDDG) MOSFETs, a nano-scale four-terminal device, where one gate can be used to change the characteristics of the other. Using current-mirrors built with IDDG-MOSFETs, we show that the number of active devices in the tunable current-mode integrator, 16 in bulk CMOS design, may be halved, i.e. considerable savings in both total area and power dissipation. The integrator operates with single supply voltage of 1 V and a wide range of tunable bandwidth (~2 decades) and gain (~30 dB). This linear circuit has third-order harmonic distortion as low as −70 dB in appropriate bias conditions, which can be set via the back-gates. The impact of tuning on the IDDG integrator and conventional design using symmetrically driven (SDDG) MOSFETs is comparatively studied. The proposed design is a good example for performance leverage through IDDG MOSFET architectures in analog circuits integral to future mixed-signal systems.
KeywordsCMOS analog integrated circuits Integrators DG-MOSFET SOI
S. Kaya was supported in part by the Air Force Office of Scientific Research, under Summer Faculty Fellowship Program, during the course of this work.
- 2.Mathew, L., et al. (2002). Vertical CMOS double gate MOSFET with notched poly gates. IEEE Si Nanoelectronics Workshop, June 2002 (pp. 5–6). Honolulu, USA.Google Scholar
- 4.Parvais, B., et al. (2007). FinFET technology for analog and RF circuits, Proceedings of ICECS (pp. 182–185), December 11–14, 2007, Marrakech, Morocco.Google Scholar
- 6.Beckett, P. (2003). Exploiting multiple functionality for nano-scale reconfigurable systems, Proceedings of GLSVLSI (pp. 50–55) April 28–29, 2003, Washington DC, USA.Google Scholar
- 12.SIA Roadmap, public.itrs.net, 2005 update.Google Scholar
- 13.DESSIS is a part of Synopsys’s TCAD Suite, http://www.synopsis.com.
- 15.Razavi, B. (1998). RF microelectronics. Englewood Cliffs, NJ: Prentice-Hall.Google Scholar
- 18.Hamed, H. F. A. (2003). A low voltage digitally programmable current-mode filter, Proceedings of ICM (pp. 413–417) Cairo, Egypt.Google Scholar