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Open AccessFeature PaperArticle

Design of a Wide-Band Voltage-Controlled Ring Oscillator Implemented in 180 nm CMOS Technology

1
Department of Electronics, INAOE, Puebla 72840, Mexico
2
SEMTECH, Aguascalientes 20115, Mexico
3
Faculty of Electronics, Benemérita Universidad Autónoma de Puebla, Puebla 72570, Mexico
*
Author to whom correspondence should be addressed.
These authors contributed equally to this work.
Electronics 2019, 8(10), 1156; https://doi.org/10.3390/electronics8101156
Received: 12 September 2019 / Revised: 3 October 2019 / Accepted: 4 October 2019 / Published: 12 October 2019
(This article belongs to the Section Circuit and Signal Processing)
The design of a wide-band voltage-controlled oscillator (VCO) modified as a VCO with programmable tail currents is introduced herein. The VCO is implemented by using CMOS current-mode logic stages, which are based on differential pairs that are connected in a ring topology. SPICE simulation results show that the VCO operates within the frequency ranges of 2.65–5.65 GHz, and when it is modified, the VCO with programmable tail currents operates between 1.38 GHz and 4.72 GHz. The design of the CMOS differential stage is detailed along with the symbolic approximation of its dominant pole, which is varied to increase the frequency response in order to achieve a higher oscillation frequency when implementing the ring oscillator structure. The layout of the VCO is described and pre- and post-layout simulations are provided, which are in good agreement using CMOS technology of 180 nm. Finally, process, voltage and temperature variations are performed to guarantee robustness of the designed CMOS ring oscillator. View Full-Text
Keywords: VCO; current-mode logic; MOSFET; PVT variations; Layout VCO; current-mode logic; MOSFET; PVT variations; Layout
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MDPI and ACS Style

Tlelo-Cuautle, E.; Castañeda-Aviña, P.R.; Trejo-Guerra, R.; Carbajal-Gómez, V.H. Design of a Wide-Band Voltage-Controlled Ring Oscillator Implemented in 180 nm CMOS Technology. Electronics 2019, 8, 1156.

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