[KSCI] Korea Science Citation Index Service

http://dx.doi.org/10.7471/ikeee.2015.19.4.465

Hartley-VCO Using Linear OTA-based Active Inductor

Jeong, Seong-Ryeol (Dept. of Semiconductor Engineering, Cheongju University)
Chung, Won-Sup (Dept. of Semiconductor Engineering, Cheongju University)

Publication Information

Journal of IKEEE / v.19, no.4, 2015 , pp. 465-471 More about this Journal

Abstract

An LC-tuned sinusoidal voltage-controlled oscillator (VCO) using temperature-stable linear operational transconductance amplifiers (OTAs) is presented. Its architecture is based on Hartley oscillator configuration, where the inductor is active one realized with two OTAs and a grounded capacitor. Two diode limiters are used for limiting amplitude. A prototype oscillator built with discrete components exhibits less than 3.1% nonlinearity in its current-to-frequency transfer characteristic from 1.99 MHz to 39.14 MHz and $220ppm/^{\circ}C$ frequency stability to the temperature drift over 0 to $75^{\circ}C$ . The total harmonic distortion (THD) is as low as 4.4 % for a specified frequency-tuning range. The simulated phase noise of the VCO is about -108.9 dBc/Hz at 1 MHz offset frequency in frequency range of 0.4 - 46.97 MHz and property of phase noise of VCO is better than colpitts-VCO.

Keywords

Analog Circuit; Hartley oscillator; Voltage-controlled oscillator; OTA; Active Inductor;

Citations & Related Records

Reference

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