A 250nm CMOS low phase noise differential VCO circuit without varactors

Abstract

In the article the realization of the new circuit of differential VCO without varactors in 250 nm CMOS technology has been described. The tuning of VCO is realized as a circuit changing load of oscillator. The control curve for differential VCO without varactors is presented. The results of comparing of phase noise for circuits differential oscillators based on N-channel and P-channel transistors has been described.