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Linearly tunable quadrature oscillator derived from LC Colpitts structure using voltage differencing transconductance amplifier and adjustable current amplifier

Authors
  • Sotner, Roman1
  • Jerabek, Jan2
  • Herencsar, Norbert2
  • Petrzela, Jiri1
  • Vrba, Kamil2
  • Kincl, Zdenek1
  • 1 Brno University of Technology, Department of Radio Electronics, Technicka 3082/12, Brno, 616 00, Czech Republic , Brno (Czechia)
  • 2 Brno University of Technology, Department of Telecommunications, Technicka 3082/12, Brno, 616 00, Czech Republic , Brno (Czechia)
Type
Published Article
Journal
Analog Integrated Circuits and Signal Processing
Publisher
Springer US
Publication Date
Jul 03, 2014
Volume
81
Issue
1
Pages
121–136
Identifiers
DOI: 10.1007/s10470-014-0353-6
Source
Springer Nature
Keywords
License
Yellow

Abstract

The paper deals with an interesting oscillator solution derived from LC Colpitts circuit structure. Electronically controllable current gain of the current amplifier is utilized for driving of oscillation condition together with two transconductances in frame of voltage differencing transconductance amplifier for adjusting of frequency of oscillation. In the proposed structure these elements replace common bipolar transistor and metal coil. Designed circuit offers important advantages, i.e. absence of metal coil, quadrature outputs, amplitudes of generated signals independent of tuning process, linear electronic control of oscillation frequency (independent of oscillation condition). Implementation of circuit for amplitude stabilization and automatic control of oscillation condition for designed circuit is simple. These benefits are not available in classical LC Colpitts structures or in many well-known third-order oscillators. The theoretical conclusions are supported by experiments with behavioral representation employing commercially available devices and also by simulations using CMOS model.

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