Design of Millimeter Wave LC Oscillators for 5G Applications

TLDR: In this article, the authors deal with the design of various LC oscillators around 25 GHz which can be used for millimeter wave CMOS radios and use a non ideal inductor modeled with parasitic elements.

Abstract: This paper deals with the design of various LC oscillators around 25 GHz which can be used for millimeter wave CMOS radios. Cross coupling is a standard technique used in oscillators and the losses in an LC tank is replenished by the negative resistance of the cross coupled circuit. This paper utilizes cross coupling technique to design oscillators centred around 25 GHz. Four topologies of oscillators are designed in 90nm CMOS technology with a peak to peak output swing of 800mV from a 1.2V supply. The design uses a non ideal inductor modeled with parasitic elements. The simulated phase noise results with the non ideal inductor is around – 97 dBc / Hz at an offset of 1 MHz and the total power consumption is around 60 µW.