A Modified Noise Analysis of a Common Source ̶ Common Gate Low Noise Transconductance Amplifier for Sub-micron Technologies


Department of Electronics, School of Electrical and Computer Engineering, Noshirvani University of Technology, Babol, Mazandaran, Iran


This paper is based on analysis of a common source - common gate low noise transconductance amplifier (CS-CG LNTA). Conventional noise analyses equations are modified by considering to the low output impedance of the sub-micron transistors and also, parasitic gate-source capacitance. The calculated equations are more accurate than calculated equations in other works. Also, analyses show that the noise of the tail transistor, which is utilized to bias the common gate transistor, will limit noise canceling advantages. So, the common gate transistor is biased by a resistor. That leads to a significant improvement in noise figure. By utilizing a Taylor series expression, a closed-form equation is obtained to calculate IIA3 for the first time. Finally, based on the calculated equation a design procedure is proposed.



1.     Liscidini, A., “Fundamentals of Modern RF Wireless Receivers: A Short Tutorial”, IEEE Solid-State Circuits Magazine,  Vol. 7, No. 2, (2015), 39–48.

2.     Murphy, D., Darabi, H., Abidi, A., Hafez, A A., Mirzaei, A., Mikhemar, M., Chang, M.C.F., “A Blocker-Tolerant, Noise-Cancelling Receiver Suitable for Wideband Wireless Applications”, IEEE Journal of Solid-State Circuits,  Vol. 47, No. 12, (2012), 2943–2963.

3.     Ud Din, I., Wernehag, J., Andersson, S., Mattisson, S., and Sjoland, H., “Wideband SAW-Less Receiver Front-End With Harmonic Rejection Mixer in 65-nm CMOS”, IEEE Transactions on Circuits and Systems II: Express Briefs,  Vol. 60, No. 5, (2013), 242–246.

4.     Fabiano, I., Sosio, M., Liscidini, A., and Castello, R., “SAW-Less Analog Front-End Receivers for TDD and FDD”, IEEE Journal of Solid-State Circuits,  Vol. 48, No. 12, (2013), 3067–3079.

5.     Ud Din, I., Wernehag, J., Andersson, S., Sjöland, H., and Mattisson, S., “Tunable wideband SAW-less receiver front-end in 65 nm CMOS”, Analog Integrated Circuits and Signal Processing,  Vol. 77, No. 1, (2013), 3–16.

6.     Kim, J., and Silva-Martinez, J., “Low-Power, Low-Cost CMOS Direct-Conversion Receiver Front-End for Multistandard Applications”, IEEE Journal of Solid-State Circuits,  Vol. 48, No. 9, (2013), 2090–2103.

7.     Mohamed, S.A.S., and Manoli, Y., “Design of Low-Power Direct-Conversion RF Front-End With a Double Balanced Current-Driven Subharmonic Mixer in 0.13 µm CMOS”, IEEE Transactions on Circuits and Systems I: Regular Papers,  Vol. 60, No. 5, (2013), 1322–1330.

8.     Wu, C., Wang, Y., Nikolic, B., and Hull, C., “An Interference-Resilient Wideband Mixer-First Receiver With LO Leakage Suppression and I/Q Correlated Orthogonal Calibration”, IEEE Transactions on Microwave Theory and Techniques,  Vol. 64, No. 4, (2016), 1088–1101.

9.     Blaakmeer, S.C., Klumperink, E.A.M., Leenaerts, D.M.W., and Nauta, B., “Wideband Balun-LNA With Simultaneous Output Balancing, Noise-Canceling and Distortion-Canceling”, IEEE Journal of Solid-State Circuits,  Vol. 43, No. 6, (2008), 1341–1350.

10.   Javadi, M., Sheikhaei, S., and Kashi, A.S., “Design of a direct conversion ultra low power ZigBee receiver RF front-end for wireless sensor networks”, Microelectronics Journal,  Vol. 44, No. 4, (2013), 347–353.

11.   Masoumi, N., and Aghnout, S., “Modeling of Substrate Noise Impact on a Single-Ended Cascode LNA in a Lightly Doped Substrate (RESEARCH NOTE)”, International Journal of Engineering - Transactions A: Basics,  Vol. 23, No. 1, (2010), 23–28.

12.   Sedaghat, S.B., Karimi, G., and Banitalebi, R., “A Low Voltage Full-band Folded Cascoded UWB LNA with Feedback Topology”, International Journal of Engineering - Transactions A: Basics,  Vol. 28, No. 1, (2015), 66–73.

13.   Asemani, M., Ardeshir, G., and Razmjooei, D., “Improving Linearity of CMOS Variable-gain Amplifier Using Third-order Intermodulation Cancellation Mechanism and Intermodulation Distortion Sinking Techniques”, International Journal of Engineering - Transactions B: Applications,  Vol. 30, No. 2, (2017), 192–198.