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OTA-C Arbitrary-Phase-Shift Oscillators

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5 Author(s)
Shu-Hui Tu ; Dept. of Electron. Eng., Nat. Taipei Univ. of Technol., Taipei, Taiwan ; Yuh-Shyan Hwang ; Jiann-Jong Chen ; Soliman, Ahmed M.
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This paper exhibits the generation of an operational transconductance amplifier and capacitor (OTA-C) arbitraryphase-shift sinusoidal oscillator (APSO) for an order n ≥ 3 for various advanced applications. A new nth-order quadrature oscillator (QO) is obtained via the algebraic quadrature manipulations of an oscillatory characteristic equation. Based on a phase shift transformation from a quadrature, an APSO is then generated by superposing OTAs with required +/- transconductance(s) in parallel with some grounded capacitor(s) on the QO. For eliminating nonideal and parasitic effects to improve phase accuracy, phase compensation schemes are proposed. A new native amplitude control exploiting the nonlinearity of all employed OTAs of the APSO is presented as well to lead to rather low THD and a lower variation of THD with respect to amplitude enlargement. A fourth-order APSO is demonstrated and simulated using Hspice with a 0.35-μm process for validation. In addition, its real application to a polyphase rectifier is improved. Finally, an experiment using LM13700s shows favorable potential of APSOs.

Published in:

Instrumentation and Measurement, IEEE Transactions on  (Volume:61 ,  Issue: 8 )

Date of Publication:

Aug. 2012

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