期刊名称：Karbala International Journal of Modern Science
印刷版ISSN：2405-609X
电子版ISSN：2405-609X
出版年度：2018
卷号：4
期号：2
页码：228-236
DOI：10.1016/j.kijoms.2018.03.001
语种：English
出版社：Elsevier
摘要：AbstractThis paper presents the design of a low phase noise voltage controlled oscillator (VCO), which offers higher transconductance (gm) by the use of parallel MOSFETs. Here, two NMOS transistors are connected in parallel with the cross-coupled NMOS transistors of a conventional cross-coupled VCO. So, the total negative conductance offered to the circuit to cancel out the parasitic resistance of the LC-tank is increased. This negative conductance is achieved without dealing with larger transistor size or any other passive elements. Hence, power dissipation and silicon area are reduced. Further, dynamic threshold MOSFET (DTMOS) with a capacitive division technique is implemented to increase the voltage swing, leading to a further decrease in phase noise. The proposed VCO is designed and simulated in UMC 180 nm technology. It achieves a tuning range of 1.58–1.60 GHz about 200 MHz, with 6.09 mW power consumption at 1.1 V supply voltage. The phase noise is obtained −40.6 dBc/Hz at 1 kHz and −120.44 dBc/Hz at 1 MHz respectively. So, it should be used in transceiver and PLL blocks for low voltage and low phase noise applications.
