Design of 6.7 GHz ~ 7. 518 GHz Cross Coupled LC-VCO in 180nm CMOS technology

Abstract

This paper discusses the analysis and design of LC VCO in 180nm CMOS technology with 7 GHz resonating frequency using Cadence Virtuoso environment. The designed circuit works at 1.8 V supply voltage. VCOs are the main component of PLL that is used in the generation of IR pulses in UWB systems. The designed LC – VCO with a bandwidth of 6.711 GHz - 7.518 GHz is to be used in the IR-UWB system that generates short pulses using indirect IR-UWB method. The gain K of LC VCO designed was 484 Mhz/V. The output power P (mw) was 2.25mw. The observed Phase noise at 1MHz is -103.2dbc/Hz and at 10 MHz is -131.5dbc/Hz. The resonating frequency was verified using PSS analysis, which gives a resonating frequency of 7 GHz. The FOM of the designed VCO is - 136.98 8 dbc/Hz.