Affiliation:
1. University School of Information, Communication and Technology, Guru Gobind Singh Indraprastha University, Sector — 16C, Dwarka, New Delhi, India
Abstract
This paper presents a new design of low power voltage controlled oscillator (VCO) circuit using three transistors NOR-gate and I-MOS (inversion mode) varactor tuning method. Variation in the oscillation frequency has been obtained by varying the output load capacitance with the use of I-MOS varactor tuning consisting of two PMOS transistors connected in parallel. Variable capacitance across the I-MOS varactor has been achieved by varying the source/drain voltage ([Formula: see text] and back-gate voltage ([Formula: see text]. Variation of [Formula: see text] from 1[Formula: see text]V to 2[Formula: see text]V provides the frequency deviation from 1.970[Formula: see text]GHz to 1.379[Formula: see text]GHz with I-MOS width of 8 [Formula: see text]m at power supply voltage ([Formula: see text] of 1.8[Formula: see text]V. Power consumption of the circuit is 1.296[Formula: see text]mW with [Formula: see text] of 1.8[Formula: see text]V. The results have been obtained for different I-MOS varactor widths like 5[Formula: see text][Formula: see text]m, 8[Formula: see text][Formula: see text]m and 10[Formula: see text][Formula: see text]m. Further, variations in the frequency have been obtained from 0.650 GHz to 2.584 GHz with the Vdd variation from 1[Formula: see text]V to 3[Formula: see text]V. In addition, by variations of [Formula: see text] from 0[Formula: see text]V to 1.8[Formula: see text]V and [Formula: see text] from 1[Formula: see text]V to 3[Formula: see text]V, the proposed oscillators operate in the frequency range from 0.556[Formula: see text]GHz to 2.584[Formula: see text]GHz for 8[Formula: see text][Formula: see text]m width of I-MOS varactor. Proposed VCO circuit show a phase noise of [Formula: see text][Formula: see text]dBc/Hz at 1[Formula: see text]MHz offset from the carrier frequency and the figure of merit (FoM) for the VCO is 154.51[Formula: see text]dB/Hz. Proposed VCO shows an improved performance in terms of power consumption, output frequency and FoM.
Publisher
World Scientific Pub Co Pte Lt
Subject
Electrical and Electronic Engineering,Hardware and Architecture,Electrical and Electronic Engineering,Hardware and Architecture
Cited by
10 articles.
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