A wide-tuning range 1.8 GHz quadrature VCO utilizing coupled ring oscillators

This paper presents a fully integrated 1.8 GHz, 0.35-mum CMOS quadrature voltage-controlled oscillator (QVCO) design. The topology uses coupled ring oscillators to produce quadrature outputs. In order to gain better phase noise performance LC-based filtering is introduced to QVCO. Also using variabl...

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Main Authors: Mesgarzadeh, B., Alvandpour, A.
Format: Conference Proceeding
Language:English
Subjects:
Circuit topology
Coupling circuits
Filtering
Frequency conversion
Inverters
Performance gain
Phase noise
Ring oscillators
Tuning
Voltage-controlled oscillators
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Alvandpour, A.
description This paper presents a fully integrated 1.8 GHz, 0.35-mum CMOS quadrature voltage-controlled oscillator (QVCO) design. The topology uses coupled ring oscillators to produce quadrature outputs. In order to gain better phase noise performance LC-based filtering is introduced to QVCO. Also using variable inductance concept, a 1.2 GHz tuning range is achieved. According to simulation results, proposed QVCO draws 26.1 mA from 3.3V supply and exhibits a worst-case phase noise of -117.3 dBc/Hz at 1-MHz offset over the tuning range
doi_str_mv 10.1109/ISCAS.2006.1693790
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source IEEE Electronic Library (IEL) Conference Proceedings
subjects Circuit topology
Coupling circuits
Filtering
Frequency conversion
Inverters
Performance gain
Phase noise
Ring oscillators
Tuning
Voltage-controlled oscillators
title A wide-tuning range 1.8 GHz quadrature VCO utilizing coupled ring oscillators
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