Design of a good oscillation frequency and moderate phase noise current mirror VCO

Abstract

Abstract This brief presents a good oscillation frequency and moderate phase noise voltage controlled oscillator (VCO) using current mirror topology. Here, a novel VCO using current mirror is designed which increases current in the cross-coupled circuit hence the single-ended output voltage. The width of mirroring transistors is decreased so that the current gain is increased in each branch of differential configuration. It leads to increase in single-ended drain current. Therefore, the close-in phase noise settlement from the enhanced voltage variation at the VCO output due to enhanced current flow in the circuit. The proposed VCO architecture is implemented in 180 nm CMOS process and simulated in Cadence tool. It demonstrates the tuning range of 2.165 to 2.235 GHz and a lower phase noise of -112 dBc/Hz at carrier offset of 1 MHz and -30 dBc/Hz at carrier offset of 1 KHz with a power consumption of 6.71 mW. So, this work will be a proper building block for the design of a customized receiver.