Investigation of Constant Transconductance Circuit for Low Power Low-Noise Amplifier
In this paper, the design of wide-swing constant transconductance (gm) bias circuit that generates bias voltage for low-noise amplifier (LNA) circuit design by using an off-chip resistor is demonstrated. The overall transconductance (Gm) generated by the constant gm bias circuit is important to maintain the overall gain and noise figure of the LNA circuit. Therefore, investigation is performed to study the variation in Gm with process, temperature and supply voltage (PVT). Temperature and supply voltage are swept from -10 °C to 85 °C and 1.425 V to 1.575 V respectively, while the process conditions are also varied to the extreme and the gm variation is eventually concluded at between -3 % to 7 %. With the slight variation in the gm value, through simulation, at worst condition of state SS, we are able to attain a conversion gain (S21) variation of -3.10 % and a noise figure (NF) variation of 18.71 %. The whole constant gm circuit draws approximately 100 µA from a 1.5V supply and is designed based on 0.13 µm CMOS process.
Digital Object Identifier (DOI): doi.org/10.5281/zenodo.1087702Procedia APA BibTeX Chicago EndNote Harvard JSON MLA RIS XML ISO 690 PDF Downloads 3755
 D. Johns, K. W. Martin, “Analog integrated circuit design,” 2nd edition, pp. 259–260.
 T.–K. Nguyem, N.–J. Oh, V.–H. Le and S. –G. Lee, “A Low-Power CMOS Direct Conversion Receiver With 3-dB NF and 30-kHz Ficker- Noise Corber for 915-MHz Band IEEE 802.15.4 ZigBee Standard,” IEEE Trans. On Microwave Theory and Tec., vol. 54, no. 2, pp. 735- 741, Feb. 2006.
 T. Lee, “The design of CMOS radio-frequency integrated circuits,” Cambridge University Press, 2004, pp. 277-284.
 J. Chen, B. Shi, “Novel Constant Transconductance References and The Comparisons With The Traditional Approach,” SSMSD 2003, pp. 104- 107, 2003.
 N. Talebbeydokhti, P. K. Hanurnolu, P. Kurahashi and U.-K. Moon, “Constant Transconductance Bias Circuit with an On-chip Resistor,” ISCAS 2006, pp. 2857-2860, 2006.