An 11.8-GHz low-power, low phase noise, 65-nm CMOS LC-VCO for V2X communication standards is presented in this work. To achieve low-phase noise performance to fulfill the 5G NR C-V2X standards, several adjustments are made to the conventional LC-VCO topologies. These adjustments are briefly explained in this work. Presented VCO consumes 3.046[Formula: see text]mA current from a 1.2-V power supply. It has [Formula: see text]116.13[Formula: see text]dBc/Hz phase noise at 1[Formula: see text]MHz offset and tuning range between 11.64[Formula: see text]GHz and 11.94[Formula: see text]GHz. A frequency divider circuit is designed and implemented to the presented VCO to satisfy the frequency spectrum of V2X radio access technologies. To the best of authors’ knowledge, this work is the first VCO implemented at 11.8 GHz in a 65-nm CMOS process with the reported phase noise number for 5G NR C-V2X applications.
An ultra-wide bandwidth fully differential two-stage 65[Formula: see text]nm CMOS operational amplifier (Opamp) is presented, which uses a novel bandwidth extension technique called “pole duplication”. This technique is based on relocating the dominant pole with the same location with a non-dominant pole and adjusting 3-dB frequency and stability with a compensation network. Simulation results show that the proposed Opamp has 103[Formula: see text]MHz 3-dB bandwidth with a 2[Formula: see text]pF load capacitor. It consumes 9[Formula: see text]mA current from 1.2-V supply. Transition frequency of 2.4[Formula: see text]GHz and a gain of 29[Formula: see text]dB is accomplished. A 2[Formula: see text]pF load capacitance can be driven at a phase margin of [Formula: see text]. The suggested pole duplication technique is used to achieve higher 3-dB cut-off frequencies by adjusting the load capacitor. Fully differential two-stage Opamp is presented, which uses a novel bandwidth extension technique, is suitable for SoC active filter applications with 40[Formula: see text][Formula: see text]m layout area and ultra-wide 3-dB bandwidth.
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