Voltage-controlled Oscillator (VCO) is a prominent part that has been used to generate a stable frequency for the high-frequency transceiver system. This survey encompasses a comparative analysis of two commonly used VCO architectures: the Ring VCO and LC-VCO. The Ring VCO has been constructed with the collection of ring delay cells.

For CMOS based VCO design in current technology, LC and Ring based VCOs are two typical choices used in PLL design [1]. LC VCOs have a superior phase noise performance compared with Ring VCOs. How-ever, an LC VCO has a small tuning range, large layout area and possibly higher power [2].

First design comprises of three stage ring VCO designed in 18 µm CMOS technology and achieves a high frequency of 5.2 GHz with a power dissipation of 152 µW under the supply voltage of 1.8 V.

This paper presents a new technique to improve the performance of ring oscillator. The VCO is based on single ended ring oscillator. The circuit is designed using 0.13 μm CMOS technology with supply voltage of 3.3 V.

A differential ring Voltage Controlled Oscillator (VCO) with a controllable KVCO is introduced. The capability to control KVCO enables post-fabrication calibration of VCO gain, in order to reduce its vulnerability to Process, Voltage, and Temperature (PVT) variations.

2016年3月4日 · In this work, we present a process variation compensated voltage-controlled ring oscillator (VCO) with the new Subtraction-based Voltage-Controlled Current Source (SVCCS).

Current starved VCO is superior to a Source Coupled VCO. Also the relative performance difference between ring VCO and LC VCO will be almost constant in the future.